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java計(jì)算器的源代碼
import java.awt.*;
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import java.awt.event.*;
import java.lang.*;
import javax.swing.*;
public class Counter extends Frame
{
//聲明三個(gè)面板的布局
GridLayout gl1,gl2,gl3;
Panel p0,p1,p2,p3;
JTextField tf1;
TextField tf2;
Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21,b22,b23,b24,b25,b26;
StringBuffer str;//顯示屏所顯示的字符串
double x,y;//x和y都是運(yùn)算數(shù)
int z;//Z表示單擊了那一個(gè)運(yùn)算符.0表示"+",1表示"-",2表示"*",3表示"/"
static double m;//記憶的數(shù)字
public Counter()
{
gl1=new GridLayout(1,4,10,0);//實(shí)例化三個(gè)面板的布局
gl2=new GridLayout(4,1,0,15);
gl3=new GridLayout(4,5,10,15);
tf1=new JTextField(27);//顯示屏
tf1.setHorizontalAlignment(JTextField.RIGHT);
tf1.setEnabled(false);
tf1.setText("0");
tf2=new TextField(10);//顯示記憶的索引值
tf2.setEditable(false);
//實(shí)例化所有按鈕、設(shè)置其前景色并注冊(cè)監(jiān)聽(tīng)器
b0=new Button("Backspace");
b0.setForeground(Color.red);
b0.addActionListener(new Bt());
b1=new Button("CE");
b1.setForeground(Color.red);
b1.addActionListener(new Bt());
b2=new Button("C");
b2.setForeground(Color.red);
b2.addActionListener(new Bt());
b3=new Button("MC");
b3.setForeground(Color.red);
b3.addActionListener(new Bt());
b4=new Button("MR");
b4.setForeground(Color.red);
b4.addActionListener(new Bt());
b5=new Button("MS");
b5.setForeground(Color.red);
b5.addActionListener(new Bt());
b6=new Button("M+");
b6.setForeground(Color.red);
b6.addActionListener(new Bt());
b7=new Button("7");
b7.setForeground(Color.blue);
b7.addActionListener(new Bt());
b8=new Button("8");
b8.setForeground(Color.blue);
b8.addActionListener(new Bt());
b9=new Button("9");
b9.setForeground(Color.blue);
b9.addActionListener(new Bt());
b10=new Button("/");
b10.setForeground(Color.red);
b10.addActionListener(new Bt());
b11=new Button("sqrt");
b11.setForeground(Color.blue);
b11.addActionListener(new Bt());
b12=new Button("4");
b12.setForeground(Color.blue);
b12.addActionListener(new Bt());
b13=new Button("5");
b13.setForeground(Color.blue);
b13.addActionListener(new Bt());
b14=new Button("6");
b14.setForeground(Color.blue);
b14.addActionListener(new Bt());
b15=new Button("*");
b15.setForeground(Color.red);
b15.addActionListener(new Bt());
b16=new Button("%");
b16.setForeground(Color.blue);
b16.addActionListener(new Bt());
b17=new Button("1");
b17.setForeground(Color.blue);
b17.addActionListener(new Bt());
b18=new Button("2");
b18.setForeground(Color.blue);
b18.addActionListener(new Bt());
b19=new Button("3");
b19.setForeground(Color.blue);
b19.addActionListener(new Bt());
b20=new Button("-");
b20.setForeground(Color.red);
b20.addActionListener(new Bt());
b21=new Button("1/X");
b21.setForeground(Color.blue);
b21.addActionListener(new Bt());
b22=new Button("0");
b22.setForeground(Color.blue);
b22.addActionListener(new Bt());
b23=new Button("+/-");
b23.setForeground(Color.blue);
b23.addActionListener(new Bt());
b24=new Button(".");
b24.setForeground(Color.blue);
b24.addActionListener(new Bt());
b25=new Button("+");
b25.setForeground(Color.red);
b25.addActionListener(new Bt());
b26=new Button("=");
b26.setForeground(Color.red);
b26.addActionListener(new Bt());
//實(shí)例化四個(gè)面板
p0=new Panel();
p1=new Panel();
p2=new Panel();
p3=new Panel();
//創(chuàng)建一個(gè)空字符串緩沖區(qū)
str=new StringBuffer();
//添加面板p0中的組件和設(shè)置其在框架中的位置和大小
p0.add(tf1);
p0.setBounds(10,25,300,40);
//添加面板p1中的組件和設(shè)置其在框架中的位置和大小
p1.setLayout(gl1);
p1.add(tf2);
p1.add(b0);
p1.add(b1);
p1.add(b2);
p1.setBounds(10,65,300,25);
//添加面板p2中的組件并設(shè)置其的框架中的位置和大小
p2.setLayout(gl2);
p2.add(b3);
p2.add(b4);
p2.add(b5);
p2.add(b6);
p2.setBounds(10,110,40,150);
//添加面板p3中的組件并設(shè)置其在框架中的位置和大小
p3.setLayout(gl3);//設(shè)置p3的布局
p3.add(b7);
p3.add(b8);
p3.add(b9);
p3.add(b10);
p3.add(b11);
p3.add(b12);
p3.add(b13);
p3.add(b14);
p3.add(b15);
p3.add(b16);
p3.add(b17);
p3.add(b18);
p3.add(b19);
p3.add(b20);
p3.add(b21);
p3.add(b22);
p3.add(b23);
p3.add(b24);
p3.add(b25);
p3.add(b26);
p3.setBounds(60,110,250,150);
//設(shè)置框架中的布局為空布局并添加4個(gè)面板
setLayout(null);
add(p0);
add(p1);
add(p2);
add(p3);
setResizable(false);//禁止調(diào)整框架的大小
//匿名類關(guān)閉窗口
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e1)
{
System.exit(0);
}
});
setBackground(Color.lightGray);
setBounds(100,100,320,280);
setVisible(true);
}
//構(gòu)造監(jiān)聽(tīng)器
class Bt implements ActionListener
{
public void actionPerformed(ActionEvent e2)
{
try{
if(e2.getSource()==b1)//選擇"CE"清零
{
tf1.setText("0");//把顯示屏清零
str.setLength(0);//清空字符串緩沖區(qū)以準(zhǔn)備接收新的輸入運(yùn)算數(shù)
}
else if(e2.getSource()==b2)//選擇"C"清零
{
tf1.setText("0");//把顯示屏清零
str.setLength(0);
}
else if(e2.getSource()==b23)//單擊"+/-"選擇輸入的運(yùn)算數(shù)是正數(shù)還是負(fù)數(shù)
{
x=Double.parseDouble(tf1.getText().trim());
tf1.setText(""+(-x));
}
else if(e2.getSource()==b25)//單擊加號(hào)按鈕獲得x的值和z的值并清空y的值
{
x=Double.parseDouble(tf1.getText().trim());
str.setLength(0);//清空緩沖區(qū)以便接收新的另一個(gè)運(yùn)算數(shù)
y=0d;
z=0;
}
else if(e2.getSource()==b20)//單擊減號(hào)按鈕獲得x的值和z的值并清空y的值
{
x=Double.parseDouble(tf1.getText().trim());
str.setLength(0);
y=0d;
z=1;
}
else if(e2.getSource()==b15)//單擊乘號(hào)按鈕獲得x的值和z的值并清空y的值
{
x=Double.parseDouble(tf1.getText().trim());
str.setLength(0);
y=0d;
z=2;
}
else if(e2.getSource()==b10)//單擊除號(hào)按鈕獲得x的值和z的值并空y的值
{
x=Double.parseDouble(tf1.getText().trim());
str.setLength(0);
y=0d;
z=3;
}
else if(e2.getSource()==b26)//單擊等號(hào)按鈕輸出計(jì)算結(jié)果
{
str.setLength(0);
switch(z)
{
case 0 : tf1.setText(""+(x+y));break;
case 1 : tf1.setText(""+(x-y));break;
case 2 : tf1.setText(""+(x*y));break;
case 3 : tf1.setText(""+(x/y));break;
}
}
else if(e2.getSource()==b24)//單擊"."按鈕輸入小數(shù)
{
if(tf1.getText().trim().indexOf(′.′)!=-1)//判斷字符串中是否已經(jīng)包含了小數(shù)點(diǎn)
{
}
else//如果沒(méi)數(shù)點(diǎn)有小
{
if(tf1.getText().trim().equals("0"))//如果初時(shí)顯示為0
{
str.setLength(0);
tf1.setText((str.append("0"+e2.getActionCommand())).toString());
}
else if(tf1.getText().trim().equals(""))//如果初時(shí)顯示為空則不做任何操作
{
}
else
{
tf1.setText(str.append(e2.getActionCommand()).toString());
}
}
y=0d;
}
else if(e2.getSource()==b11)//求平方根
{
x=Double.parseDouble(tf1.getText().trim());
tf1.setText("數(shù)字格式異常");
if(x0)
tf1.setText("負(fù)數(shù)沒(méi)有平方根");
else
tf1.setText(""+Math.sqrt(x));
str.setLength(0);
y=0d;
}
else if(e2.getSource()==b16)//單擊了"%"按鈕
{
x=Double.parseDouble(tf1.getText().trim());
tf1.setText(""+(0.01*x));
str.setLength(0);
y=0d;
}
else if(e2.getSource()==b21)//單擊了"1/X"按鈕
{
x=Double.parseDouble(tf1.getText().trim());
if(x==0)
{
tf1.setText("除數(shù)不能為零");
}
else
{
tf1.setText(""+(1/x));
}
str.setLength(0);
y=0d;
}
else if(e2.getSource()==b3)//MC為清除內(nèi)存
{
m=0d;
tf2.setText("");
str.setLength(0);
}
else if(e2.getSource()==b4)//MR為重新調(diào)用存儲(chǔ)的數(shù)據(jù)
{
if(tf2.getText().trim()!="")//有記憶數(shù)字
{
tf1.setText(""+m);
}
}
else if(e2.getSource()==b5)//MS為存儲(chǔ)顯示的數(shù)據(jù)
{
m=Double.parseDouble(tf1.getText().trim());
tf2.setText("M");
tf1.setText("0");
str.setLength(0);
}
else if(e2.getSource()==b6)//M+為將顯示的數(shù)字與已經(jīng)存儲(chǔ)的數(shù)據(jù)相加要查看新的數(shù)字單擊MR
{
m=m+Double.parseDouble(tf1.getText().trim());
}
else//選擇的是其他的按鈕
{
if(e2.getSource()==b22)//如果選擇的是"0"這個(gè)數(shù)字鍵
{
if(tf1.getText().trim().equals("0"))//如果顯示屏顯示的為零不做操作
{
}
else
{
tf1.setText(str.append(e2.getActionCommand()).toString());
y=Double.parseDouble(tf1.getText().trim());
}
}
else if(e2.getSource()==b0)//選擇的是“BackSpace”按鈕
{
if(!tf1.getText().trim().equals("0"))//如果顯示屏顯示的不是零
{
if(str.length()!=1)
{
tf1.setText(str.delete(str.length()-1,str.length()).toString());//可能拋出字符串越界異常
}
else
{
tf1.setText("0");
str.setLength(0);
}
}
y=Double.parseDouble(tf1.getText().trim());
}
else//其他的數(shù)字鍵
{
tf1.setText(str.append(e2.getActionCommand()).toString());
y=Double.parseDouble(tf1.getText().trim());
}
}
}
catch(NumberFormatException e){
tf1.setText("數(shù)字格式異常");
}
catch(StringIndexOutOfBoundsException e){
tf1.setText("字符串索引越界");
}
}
}
public static void main(String args[])
{
new Counter();
急：求一個(gè)簡(jiǎn)單的JAVA計(jì)算器代碼，簡(jiǎn)單點(diǎn)，有圖形界面的
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;
class Stack_Float
{
float nums[];
int top;
Stack_Float()
{
nums = new float[50];
top = -1;
}
boolean IsEmpty()
{
if (top == -1)
return true;
else
return false;
}
float Pop_Stack()
{
if (top == -1)
{
return 0;
}
top--;
return nums[top + 1];
}
float GetTop()
{
return nums[top];
}
void Push_Stack(float num)
{
if (top == 49)
return;
top++;
nums[top] = num;
}
}
class Stack_Char
{
char str[];
int top;
Stack_Char()
{
str = new char[50];
top = -1;
}
boolean CanPush(char c)
{
int temp = top;
if (c == '(')
{
while (temp != -1)
{
if (str[temp] == '(')
{
return false;
}
temp--;
}
}
temp = top;
if (c == '[')
{
while (temp != -1)
{
if (str[temp] == '[' || str[temp] == '(')
{
return false;
}
temp--;
}
}
if (c == '{')
{
while (temp != -1)
{
if (str[temp] == '{' || str[temp] == '[' || str[temp] == '(')
{
return false;
}
temp--;
}
}
return true;
}
boolean IsEmpty()
{
if (top == -1)
return true;
else
return false;
}
void Push_Stack(char ch)
{
if (top == 49)
return;
top++;
str[top] = ch;
}
char Pop_Stack()
{
if (top == -1)
return '\0';
top--;
return str[top + 1];
}
char GetTop()
{
if (top == -1)
{
System.out.print("error");
System.exit(0);
}
return str[top];
}
}
public class jisuanqi extends javax.swing.JFrame implements ActionListener
{
JTextField text = new JTextField();
JTextField text1 = new JTextField();
JButton jButton1 = new JButton();
JButton jButton2 = new JButton();
JButton jButton3 = new JButton();
JButton jButton4 = new JButton();
JButton jButton5 = new JButton();
JButton jButton6 = new JButton();
JButton jButton7 = new JButton();
JButton jButton8 = new JButton();
JButton jButton9 = new JButton();
JButton jButton10 = new JButton();
JButton jButton11 = new JButton();
JButton jButton12 = new JButton();
JButton jButton13 = new JButton();
JButton jButton14 = new JButton();
JButton jButton15 = new JButton();
JButton jButton16 = new JButton();
JButton jButton17 = new JButton();
JButton jButton18 = new JButton();
JButton jButton19 = new JButton();
JButton jButton20 = new JButton();
JButton jButton21 = new JButton();
JButton jButton22 = new JButton();
String show = "";
public jisuanqi()
{
initComponents();
}
char[] TranSmit(char str[])
{
char houzhui[] = new char[50]; // 存放后綴表達(dá)式的字符串
int i = 0, j = 0;
char c = str[i];
Stack_Char s = new Stack_Char(); // 存放運(yùn)算符的棧
while (c != '=') // 對(duì)算術(shù)表達(dá)式掃描未結(jié)束時(shí)
{
if (c = '0' c = '9')
{
while (c = '0' c = '9')// 數(shù)字直接入棧
{
houzhui[j] = c;
j++;
i++;
c = str[i];
}
houzhui[j] = '#';// 用#隔開(kāi)數(shù)字
j++;
}
switch (c) // 掃描到運(yùn)算符時(shí)
{
case '+':
case '-':
case '*':
case '/':
case '(':
case '[':
case '{':
if (s.IsEmpty() == true) // 棧空,直接入棧
{
s.Push_Stack(c);
i++;
c = str[i];
break;
}
if (ComPare(s.GetTop(), c) == -1) {
s.Push_Stack(c); // 入棧
i++;
c = str[i];
break;
}
if (ComPare(s.GetTop(), c) == 1) {
houzhui[j] = s.Pop_Stack();// 出棧元素存入后綴表達(dá)式
j++;
break;
}
case ')': // 掃描到 )
while (s.GetTop() != '(') // 未掃描到 ( 時(shí),出棧
{
houzhui[j] = s.Pop_Stack();
j++;
}
s.Pop_Stack(); // '(' 出棧
i++;
c = str[i];
break;
case ']': // 掃描到 ]
while (s.GetTop() != '[') // 未掃描到 [ 時(shí),出棧
{
houzhui[j] = s.Pop_Stack();
j++;
}
s.Pop_Stack(); // '[' 出棧
i++;
c = str[i];
break;
case '}': // 掃描到 }
while (s.GetTop() != '{') // 未掃描到 { 時(shí),出棧
{
houzhui[j] = s.Pop_Stack();
j++;
}
s.Pop_Stack(); // '{' 出棧
i++;
c = str[i];
break;
}
}
while (s.IsEmpty() != true)// 把剩余的運(yùn)算符直接出棧
{
houzhui[j] = s.Pop_Stack();
j++;
}
houzhui[j] = '=';// 后綴表達(dá)式后面加 =
j++;
houzhui[j] = '\0';
j++;
return houzhui;
}
float Count(char str[])
{
Stack_Float s = new Stack_Float();// 定義存放數(shù)字的棧
char c = str[0];
int i = 0;
float result = 0, temp, left, right;
while (c != '=') // 未掃描到 = 時(shí)
{
if (c = '0' c = '9')// 掃描到數(shù)字
{
temp = 0;
while (c != '#')// 未讀到分隔符時(shí)
{
temp = temp * 10 + c - '0';
i++;
c = str[i];
}
s.Push_Stack(temp);// 進(jìn)棧
}
switch (c)// 掃描到運(yùn)算符時(shí)
{
case '+':
{
result = s.Pop_Stack() + s.Pop_Stack();// 2個(gè)數(shù)字出棧相加
s.Push_Stack(result);// 最后得數(shù)進(jìn)棧
break;
}
case '-':
{
right = s.Pop_Stack();// 右操作數(shù)出棧
left = s.Pop_Stack();// 左操作數(shù)出棧
result = left - right;
s.Push_Stack(result);
break;
}
case '*':
{
result = s.Pop_Stack() * s.Pop_Stack();// 2個(gè)數(shù)字出棧相乘
s.Push_Stack(result);
break;
}
case '/':
{
right = s.Pop_Stack();// 右操作數(shù)出棧
left = s.Pop_Stack();// 左操作數(shù)出棧
result = left / right;
s.Push_Stack(result);
break;
}
}
i++;
c = str[i];
}
return result;
}
int ComPare(char a, char b) // 判斷運(yùn)算符的優(yōu)先級(jí)函數(shù)
{
int s[][] = {// 棧頂元素高于算術(shù)表達(dá)式中的元素時(shí), 返回 1,否則返回 -1
{ 1, 1, -1, -1, -1, 1, -1, 1, -1, 1 },
{ 1, 1, -1, -1, -1, 1, -1, 1, -1, 1 },
{ 1, 1, 1, 1, -1, 1, -1, 1, -1, 1 },
{ 1, 1, 1, 1, -1, 1, -1, 1, -1, 1 },
{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
{ 1, 1, 1, 1, -1, 1, -1, -1, -1, -1 },
{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
{ 1, 1, 1, 1, -1, -1, -1, -1, -1, 1 },
{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
{ 1, 1, 1, 1, -1, -1, -1, -1, -1, -1 } };
char x1[] = { '+', '-', '*', '/', '(', ')', '[', ']', '{', '}' };// 棧頂元素
char x2[] = { '+', '-', '*', '/', '(', ')', '[', ']', '{', '}' };// 算術(shù)表達(dá)式中的元素
int k = 0, m, n = 0;
for (m = 0; m 10; m++) // 查找2個(gè)進(jìn)行比較的運(yùn)算符在表中的位置,并返回比較結(jié)果
{
for (n = 0; n 10; n++)
{
if (x1[m] == a x2[n] == b)
{
k = 1;
break; // 找到比較結(jié)果后,跳出循環(huán)
}
}
if (k == 1)
break;
}
return s[m][n];// 返回比較結(jié)果
}
public void actionPerformed(ActionEvent e)
{
if (e.getSource() == jButton1)
{
show += "1";
text.setText(show);
}
if (e.getSource() == jButton2)
{
show += "2";
text.setText(show);
}
if (e.getSource() == jButton3)
{
show += "3";
text.setText(show);
}
if (e.getSource() == jButton4)
{
show += "4";
text.setText(show);
}
if (e.getSource() == jButton5)
{
show += "5";
text.setText(show);
}
if (e.getSource() == jButton6)
{
show += "6";
text.setText(show);
}
if (e.getSource() == jButton7)
{
show += "7";
text.setText(show);
}
if (e.getSource() == jButton8)
{
show += "8";
text.setText(show);
}
if (e.getSource() == jButton9)
{
show += "9";
text.setText(show);
}
if (e.getSource() == jButton10)
{
show += "0";
text.setText(show);
}
if (e.getSource() == jButton11)
{
show += "+";
text.setText(show);
}
if (e.getSource() == jButton12)
{
show += "-";
text.setText(show);
}
if (e.getSource() == jButton13)
{
show += "*";
text.setText(show);
}
if (e.getSource() == jButton14)
{
show += "/";
text.setText(show);
}
if (e.getSource() == jButton15)
{
show += "(";
text.setText(show);
}
if (e.getSource() == jButton16)
{
show += ")";
text.setText(show);
}
if (e.getSource() == jButton17)
{
show += "[";
text.setText(show);
}
if (e.getSource() == jButton18)
{
show += "]";
text.setText(show);
}
if (e.getSource() == jButton19)
{
show += "{";
text.setText(show);
}
if (e.getSource() == jButton20)
{
show += "}";
text.setText(show);
}
if (e.getSource() == jButton21)
{
show = "";
text.setText("");
text1.setText("");
}
if (e.getSource() == jButton22)
{
show += "=";
text.setText(show);
char str1[] = new char[50];
char str2[] = new char[50];
float result = 0;
str1 = show.toCharArray();
str2 = TranSmit(str1);
result = Count(str2);
text1.setText((new String(str2)).trim());
text.setText("" + result);
show = "";
}
}
private void initComponents()
{
text.setBounds(10, 10, 270, 30);
text1.setBounds(10, 50, 270, 30);
jButton1.setBounds(10, 90, 60, 25);
jButton2.setBounds(80, 90, 60, 25);
jButton3.setBounds(150, 90, 60, 25);
jButton4.setBounds(220, 90, 60, 25);
jButton5.setBounds(10, 120, 60, 25);
jButton6.setBounds(80, 120, 60, 25);
jButton7.setBounds(150, 120, 60, 25);
jButton8.setBounds(220, 120, 60, 25);
jButton9.setBounds(10, 150, 60, 25);
jButton10.setBounds(80, 150, 60, 25);
jButton11.setBounds(150, 150, 60, 25);
jButton12.setBounds(220, 150, 60, 25);
jButton13.setBounds(10, 180, 60, 25);
jButton14.setBounds(80, 180, 60, 25);
jButton15.setBounds(150, 180, 60, 25);
jButton16.setBounds(220, 180, 60, 25);
jButton17.setBounds(150, 210, 60, 25);
jButton18.setBounds(220, 210, 60, 25);
jButton19.setBounds(10, 210, 60, 25);
jButton20.setBounds(80, 210, 60, 25);
jButton21.setBounds(10, 240, 60, 25);
jButton22.setBounds(80, 240, 60, 25);
jButton1.setText("1");
jButton2.setText("2");
jButton3.setText("3");
jButton4.setText("4");
jButton5.setText("5");
jButton6.setText("6");
jButton7.setText("7");
jButton8.setText("8");
jButton9.setText("9");
jButton10.setText("0");
jButton11.setText("+");
jButton12.setText("-");
jButton13.setText("*");
jButton14.setText("/");
jButton15.setText("(");
jButton16.setText(")");
jButton17.setText("[");
jButton18.setText("]");
jButton19.setText("{");
jButton20.setText("}");
jButton21.setText("CE");
jButton22.setText("=");
jButton1.addActionListener(this);
jButton2.addActionListener(this);
jButton3.addActionListener(this);
jButton4.addActionListener(this);
jButton5.addActionListener(this);
jButton6.addActionListener(this);
jButton7.addActionListener(this);
jButton8.addActionListener(this);
jButton9.addActionListener(this);
jButton10.addActionListener(this);
jButton11.addActionListener(this);
jButton12.addActionListener(this);
jButton13.addActionListener(this);
jButton14.addActionListener(this);
jButton15.addActionListener(this);
jButton16.addActionListener(this);
jButton17.addActionListener(this);
jButton18.addActionListener(this);
jButton19.addActionListener(this);
jButton20.addActionListener(this);
jButton21.addActionListener(this);
jButton22.addActionListener(this);
add(text);
add(text1);
add(jButton1);
add(jButton2);
add(jButton3);
add(jButton4);
add(jButton5);
add(jButton6);
add(jButton7);
add(jButton8);
add(jButton9);
add(jButton10);
add(jButton11);
add(jButton12);
add(jButton13);
add(jButton14);
add(jButton15);
add(jButton16);
add(jButton17);
add(jButton18);
add(jButton19);
add(jButton20);
add(jButton21);
add(jButton22);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(null);
setBounds(300, 300, 300, 300);
setVisible(true);
}
public static void main(String args[])
{
new jisuanqi();
}
}
Java圖形界面簡(jiǎn)單計(jì)算器
示例代碼如下，請(qǐng)參考：
package?test.com.test;
import?java.awt.*;
import?java.awt.event.*;
import?javax.swing.*;
public?class?Cal?{
TextField?tf?=?new?TextField(40);???????//顯示文本框
StringBuffer?s1?=?new?StringBuffer();???//記錄運(yùn)算數(shù)字，以及保留結(jié)果
StringBuffer?s2?=?new?StringBuffer();???//記錄運(yùn)算數(shù)字，保留上一個(gè)輸入的數(shù)字或運(yùn)算結(jié)果
static?String?flag?=?new?String();??????//標(biāo)記運(yùn)算符號(hào)：+，-，*，/
boolean?start?=?true;???//標(biāo)記運(yùn)算開(kāi)始或結(jié)束,保證一次運(yùn)算之后，第二次進(jìn)行運(yùn)算時(shí)能同時(shí)清空顯示界面，即s1為空
public?void?init(){
//主界面
JFrame?f?=?new?JFrame("計(jì)算器");
JPanel?p1?=?new?JPanel();
p1.add(tf);
f.add(p1,BorderLayout.NORTH);
JPanel?p2?=?new?JPanel();
p2.setLayout(new?GridLayout(1,3));
//動(dòng)作監(jiān)聽(tīng)器
ActionListener?listen?=new?ActionListener()?{
public?void?actionPerformed(ActionEvent?arg0)?{
//輸入數(shù)字0~9
if(arg0.getActionCommand()=="0"){
if(!s1.toString().equals(new?String())){
if(!start){
//s1清零，保證可以重新輸入數(shù)字
s1.delete(0,?s1.length());
}
start?=?true;
tf.setText(s1.append("0").toString());
}???
}
if(arg0.getActionCommand()=="1"){
if(!start){
s1.delete(0,?s1.length());
}
start?=?true;
tf.setText(s1.append("1").toString());
}
if(arg0.getActionCommand()=="2"){
if(!start){
s1.delete(0,?s1.length());
}
start?=?true;
tf.setText(s1.append("2").toString());
}
if(arg0.getActionCommand()=="3"){
if(!start){
s1.delete(0,?s1.length());
}
start?=?true;
tf.setText(s1.append("3").toString());
}
if(arg0.getActionCommand()=="4"){
if(!start){
s1.delete(0,?s1.length());
}
start?=?true;
tf.setText(s1.append("4").toString());
}
if(arg0.getActionCommand()=="5"){
if(!start){
s1.delete(0,?s1.length());
}
start?=?true;
tf.setText(s1.append("5").toString());
}
if(arg0.getActionCommand()=="6"){
if(!start){
s1.delete(0,?s1.length());
}
start?=?true;
tf.setText(s1.append("6").toString());
}
if(arg0.getActionCommand()=="7"){
if(!start){
s1.delete(0,?s1.length());
}
start?=?true;
tf.setText(s1.append("7").toString());
}
if(arg0.getActionCommand()=="8"){
if(!start){
s1.delete(0,?s1.length());
}
start?=?true;
tf.setText(s1.append("8").toString());
}
if(arg0.getActionCommand()=="9"){
if(!start){
s1.delete(0,?s1.length());
}
start?=?true;
tf.setText(s1.append("9").toString());
}
//輸入小數(shù)點(diǎn)
if(arg0.getActionCommand()=="."){
if(!start){
s1.delete(0,?s1.length());
}
start=true;
if(s1.toString().equals(new?String()))
tf.setText(s1.append("0.").toString());
else?if(s1.length()==1s1.charAt(0)=='-')
tf.setText(s1.append("0.").toString());
else
tf.setText(s1.append(".").toString());
}
//輸入負(fù)號(hào)
if(arg0.getActionCommand()=="+/-"){
if(!start){
s1.delete(0,?s1.length());
}
start?=?true;
if(s1.toString().equals(new?String()))
tf.setText(s1.append('-').toString());
}
//退格Backspace
if(arg0.getActionCommand()=="Backspace"){
start?=?true;
if(s1.length()!=0){
//刪除最后輸入的一位
s1.deleteCharAt(s1.length()-1);
tf.setText(s1.toString());
}
}
//歸零CE
if(arg0.getActionCommand()=="CE"){
//清空所有，start標(biāo)記設(shè)為true
start?=?true;
s1.delete(0,?s1.length());
s2.delete(0,?s2.length());
tf.setText(s1.toString());
}
//清除C
if(arg0.getActionCommand()=="C"){
//清空當(dāng)前輸入，即s1清零
start?=?true;
s1.delete(0,?s1.length());
tf.setText(s1.toString());
}
//加號(hào)
if(arg0.getActionCommand()=="+"){
start?=?true;
flag="+";
//s2接收s1的值
s2.append(String.valueOf(s1.toString()));
//s1清零，重新接收下一個(gè)數(shù)據(jù)
s1.delete(0,?s1.length());
tf.setText(s1.toString());
}
//減號(hào)
if(arg0.getActionCommand()=="-"){
start?=?true;
flag="-";
s2.append(String.valueOf(s1.toString()));
s1.delete(0,?s1.length());
tf.setText(s1.toString());
}
//乘號(hào)
if(arg0.getActionCommand()=="*"){
start?=?true;
flag="*";
s2.append(String.valueOf(s1.toString()));
s1.delete(0,?s1.length());
tf.setText(s1.toString());
}
//除號(hào)
if(arg0.getActionCommand()=="/"){
start?=?true;
flag="/";
s2.append(String.valueOf(s1.toString()));
s1.delete(0,?s1.length());
tf.setText(s1.toString());
}
//開(kāi)根號(hào)
if(arg0.getActionCommand()=="sqrt"){
start?=false;
double?s=Double.parseDouble(s1.toString());
s1.delete(0,?s1.length());
tf.setText(s1.append(String.valueOf(Math.sqrt(s))).toString());
}
//求%
if(arg0.getActionCommand()=="%"){
start?=false;
double?s=Double.parseDouble(s1.toString());
s1.delete(0,?s1.length());
tf.setText(s1.append(String.valueOf(s/100)).toString());
}
//求1/x
if(arg0.getActionCommand()=="1/x"!s1.toString().equals(new?String())Double.parseDouble(s1.toString())!=0){
start?=false;
double?s=Double.parseDouble(s1.toString());
s1.delete(0,?s1.length());
tf.setText(s1.append(String.valueOf(1/s)).toString());
}
//求結(jié)果
if(arg0.getActionCommand()=="="s1.length()!=0s2.length()!=0){
//start標(biāo)記為false
start?=false;
//分別獲取s1和s2的值
double?s4=Double.parseDouble(s1.toString());?
double?s3=Double.parseDouble(s2.toString());
//清空s1和s2，便于開(kāi)始下一次運(yùn)算
s1.delete(0,?s1.length());
s2.delete(0,?s2.length());
//四則運(yùn)算
if(flag=="+"){
tf.setText(s1.append(String.valueOf(s3+s4)).toString());
}
if(flag=="-"){
tf.setText(s1.append(String.valueOf(s3-s4)).toString());
}
if(flag=="*"){
tf.setText(s1.append(String.valueOf(s3*s4)).toString());
}
if(flag=="/"){
tf.setText(s1.append(String.valueOf(s3/s4)).toString());
}
}???????
}
};
//添加按鈕以及監(jiān)聽(tīng)器
JButton?bks?=?new?JButton("Backspace");
bks.addActionListener(listen);
JButton?ce?=?new?JButton("CE");
ce.addActionListener(listen);
JButton?c?=?new?JButton("C");
c.addActionListener(listen);
p2.add(bks);
p2.add(ce);
p2.add(c);
f.add(p2);
JPanel?p3?=?new?JPanel();
p3.setLayout(new?GridLayout(4,5));
JButton?b1?=?new?JButton("7");
p3.add(b1);
b1.addActionListener(listen);
JButton?b2?=?new?JButton("8");
p3.add(b2);
b2.addActionListener(listen);
JButton?b3?=?new?JButton("9");
p3.add(b3);
b3.addActionListener(listen);
JButton?b4?=?new?JButton("/");
p3.add(b4);
b4.addActionListener(listen);
JButton?b5?=?new?JButton("sqrt");
p3.add(b5);
b5.addActionListener(listen);
JButton?b6?=?new?JButton("4");
p3.add(b6);
b6.addActionListener(listen);
JButton?b7?=?new?JButton("5");
p3.add(b7);
b7.addActionListener(listen);
JButton?b8?=?new?JButton("6");
p3.add(b8);
b8.addActionListener(listen);
JButton?b9?=?new?JButton("*");
p3.add(b9);
b9.addActionListener(listen);
JButton?b10?=?new?JButton("%");
p3.add(b10);
b10.addActionListener(listen);
JButton?b11?=?new?JButton("1");
p3.add(b11);
b11.addActionListener(listen);
JButton?b12?=?new?JButton("2");
p3.add(b12);
b12.addActionListener(listen);
JButton?b13?=?new?JButton("3");
p3.add(b13);
b13.addActionListener(listen);
JButton?b14?=?new?JButton("-");
p3.add(b14);
b14.addActionListener(listen);
JButton?b15?=?new?JButton("1/x");
p3.add(b15);
b15.addActionListener(listen);
JButton?b16?=?new?JButton("0");
p3.add(b16);
b16.addActionListener(listen);
JButton?b17?=?new?JButton("+/-");
p3.add(b17);
b17.addActionListener(listen);
JButton?b18?=?new?JButton(".");
p3.add(b18);
b18.addActionListener(listen);
JButton?b19?=?new?JButton("+");
p3.add(b19);
b19.addActionListener(listen);
JButton?b20?=?new?JButton("=");
p3.add(b20);
b20.addActionListener(listen);
f.add(p3,BorderLayout.SOUTH);
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
f.pack();
f.setVisible(true);
}
public?static?void?main(String?args[]){
//調(diào)用方法，實(shí)現(xiàn)計(jì)算器
new?Cal().init();
}
}
用JAVA編寫(xiě)的科學(xué)計(jì)算器源代碼
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
class Counter extends WindowAdapter
{
static JFrame f=new JFrame("計(jì)算器");
static JTextField text1=new JTextField("0.");
static String source="";
static String cal="";
static String object="";
static boolean flag=false;
static boolean flag1=true;
static boolean flag2=false;
public void init()
{
try
{
Container c=f.getContentPane();
JPanel pan1=new JPanel();
JButton b1=new JButton("1");
JButton b2=new JButton("2");
JButton b3=new JButton("3");
JButton b4=new JButton("4");
JButton b5=new JButton("5");
JButton b6=new JButton("6");
JButton b7=new JButton("7");
JButton b8=new JButton("8");
JButton b9=new JButton("9");
JButton b0=new JButton("0");
JButton b11=new JButton("+");
JButton b12=new JButton("-");
JButton b13=new JButton("*");
JButton b14=new JButton("/");
JButton b15=new JButton(".");
JButton b16=new JButton("=");
JButton bclar=new JButton("清零");
text1.setHorizontalAlignment(JTextField.RIGHT);
c.add(text1,"North");
c.add(pan1);
A aa=new A();
Result re=new Result();
Opertion op=new Opertion();
Clar cl=new Clar();
b1.addActionListener(aa);
b2.addActionListener(aa);
b3.addActionListener(aa);
b4.addActionListener(aa);
b5.addActionListener(aa);
b6.addActionListener(aa);
b7.addActionListener(aa);
b8.addActionListener(aa);
b9.addActionListener(aa);
b0.addActionListener(aa);
b11.addActionListener(op);
b12.addActionListener(op);
b13.addActionListener(op);
b14.addActionListener(op);
b16.addActionListener(re);
b15.addActionListener(aa);
bclar.addActionListener(cl);
pan1.add(b1);
pan1.add(b2);
pan1.add(b3);
pan1.add(b11);
pan1.add(b4);
pan1.add(b5);
pan1.add(b6);
pan1.add(b12);
pan1.add(b7);
pan1.add(b8);
pan1.add(b9);
pan1.add(b13);
pan1.add(b0);
pan1.add(b15);
pan1.add(b16);
pan1.add(b14);
pan1.add(bclar);
f.setSize(200,220);
f.setVisible(true);
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
}
class A implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
String a=text1.getText();
String s=e.getActionCommand();
if(a.equals("0.")||a.equals("+")||a.equals("-")||a.equals("*")||a.equals("/"))
text1.setText(s);
else {
if(flag2)
{
text1.setText(s);
flag2=false;
}
else
text1.setText(a+s);
}
}
}
class Opertion implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
cal=e.getActionCommand();
if(flag1==true)
source=text1.getText();
text1.setText(cal);
flag1=false;
flag=true;
}
}
class Result implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
double num1;
num1=Double.parseDouble(source);
object=text1.getText();
double num2;
num2=Double.parseDouble(object);
double result=0;
if(cal.equals("+"))
result=num1+num2;
if(cal.equals("-"))
result=num1-num2;
if(cal.equals("*"))
result=num1*num2;
if(cal.equals("/"))
if(num2==0)
text1.setText("除數(shù)不能為0");
else
result=num1/num2;
String s1=Double.toString(result);
text1.setText(s1);
flag1=true;
flag2=true;
}
}
class Clar implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
text1.setText("0.");
}
}
public static void main(String[] args)
{
Counter count=new Counter();
count.init();
}
public void windowClosing(WindowEvent e){
System.exit(1);
}
public void windowOpened(WindowEvent e){}
public void windowIconified(WindowEvent e){}
public void windowDeiconified(WindowEvent e){}
public void windowClosed(WindowEvent e){}
public void windowActivated(WindowEvent e){}
public void windowDeactivated(WindowEvent e){}
}
Java程序－－編寫(xiě)一個(gè)具有圖形界面的計(jì)算器程序
import java.awt.*;
import java.awt.event.*;
import java.io.*;
public class Test implements ActionListener
{
Frame f = new Frame("一步運(yùn)算計(jì)算器");//創(chuàng)建窗架
TextField[] tf = new TextField[3];
Label La1 = new Label("+");
Button btn = new Button("=");
int[] a = new int[3]; //儲(chǔ)存數(shù)據(jù)
public Test()
{
f.setLayout(new FlowLayout());
f.setSize(400,100);
f.addWindowListener
(
new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}
); //窗口關(guān)閉事件
btn.addActionListener //輸出加法運(yùn)算結(jié)果
(
new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
tf[2].setText(Integer.toString(a[2]));
}
}
);
for(int i = 0;i3;i++)
{
tf[i] = new TextField(8);
tf[i].addActionListener(this); //創(chuàng)建文本域,注冊(cè)事件監(jiān)聽(tīng)器
}
tf[0].requestFocusInWindow(); //光標(biāo)定位
f.add(tf[0]);
f.add(La1);
f.add(tf[1]);
f.add(btn);
f.add(tf[2]);
f.show();
}
public void actionPerformed(ActionEvent e)
{
try
{
if(e.getSource()==tf[0])
{
a[0]=Integer.valueOf(tf[0].getText()).intValue();
tf[1].requestFocusInWindow();
}
if(e.getSource()==tf[1])
{
a[1]=Integer.valueOf(tf[1].getText()).intValue();
btn.requestFocusInWindow();
}
a[2] = a[0]+a[1];
}
catch(Exception ex)
{
}
}
public static void main(String[] args) throws Exception
{
Test t = new Test();
}
}
在文本域中輸入完后必須按Enter才能完成正確的功能.再按等號(hào)按鈕輸出結(jié)果.
JAVA計(jì)算器代碼
import java.awt.*;
import java.applet.*;
public class CalculatorDemo extends Applet
{
TextField answerText;
Button pointButton,equalButton,plusButton;
Button minusButton,clearButton,multiButton,divisionButton;
Button[] b=new Button[10];
String currentOp,preOp;
String foreText,backText;
boolean isFloat=false;
public void init()
{
Panel p1=new Panel();
Panel p2=new Panel();
Panel p3=new Panel();
currentOp=new String("");
preOp=new String("");
foreText=new String("");
backText=new String("");
answerText=new TextField(8);
setBackground(Color.lightGray);
setForeground(Color.blue);
for(int i=9;i=0;i--)
{
b[i]=new Button(Integer.toString(i));
p2.add(b[i]);
}
pointButton=new Button(".");
equalButton=new Button("=");
equalButton.setForeground(Color.red);
clearButton=new Button("清除");
clearButton.setForeground(Color.red);
divisionButton=new Button("/");
divisionButton.setForeground(Color.red);
multiButton=new Button("*");
multiButton.setForeground(Color.red);
minusButton=new Button("-");
minusButton.setForeground(Color.red);
plusButton=new Button("+");
plusButton.setForeground(Color.red);
setLayout(new FlowLayout());
p1.setLayout(new FlowLayout());
p2.setLayout(new GridLayout(4,3));
p3.setLayout(new GridLayout(4,1));
p1.add(answerText);
p1.add(clearButton);
p2.add(pointButton);
p2.add(equalButton);
p3.add(plusButton);
p3.add(minusButton);
p3.add(multiButton);
p3.add(divisionButton);
add(p1);
add(p2);
add(p3);
}
public boolean action(Event e,Object o)
{
String s=new String("");
for(int i=0;i10;i++)
{
if(e.target==b[i]||e.target==pointButton)
{
if(e.target !=pointButton)
{
s=(String)o;
doForeText(s);
}
if((e.target==pointButton)(!isFloat))
{
isFloat=true;
s=(String)o;
if(foreText.equals(""))
{
foreText +="0.";
}
else
{
doForeText(s);
}
}
}
}
if(e.target==clearButton)
{
doClear();
}
if((e.target==clearButton)||(e.target==divisionButton)
||(e.target==plusButton)||(e.target==minusButton))
{
if(foreText !="")
{
currentOp=((String)o);
doOperator();
}
else
{
preOp=((String)o);
}
}
if(e.target==equalButton)
{
doOperator();
}
return true;
}
public void doOperator()
{
double dFore,dBack;
Double d;
if(preOp.equals(""))
{
backText=foreText;
foreText="";
answerText.setText(backText);
}
else
{
dFore=(new Double(foreText)).doubleValue();
dBack=(new Double(backText)).doubleValue();
foreText="";
backText=answerText.getText();
if(preOp.equals("+"))
{
d=new Double((dBack+dFore));
answerText.setText(d.toString());
backText=d.toString();
}
if(preOp.equals("-"))
{
d=new Double((dBack-dFore));
answerText.setText(d.toString());
backText=d.toString();
}
if(preOp.equals("*"))
{
d=new Double((dBack*dFore));
answerText.setText(d.toString());
backText=d.toString();
}
if(preOp.equals("/"))
{
if(dFore==0)
{
answerText.setText("除數(shù)不能為0");
return;
}
d=new Double((dBack/dFore));
answerText.setText(d.toString());
backText=d.toString();
}
}
preOp=currentOp;
}
public void doForeText(String s)
{
foreText +=s;
answerText.setText(foreText);
}
public void doBackText(String s)
{
backText=foreText;
foreText="";
answerText.setText(foreText);
}
public void doClear()
{
currentOp="";
preOp="";
foreText="";
backText="";
isFloat=false;
answerText.setText("");
}
}
文章名稱：java圖形計(jì)算器源代碼,java圖形計(jì)算器源代碼怎么用
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