jsq.java

计算器的JAVA源码是针对学习软件工程专业的学生在进行《软件工程导论》课时的必备参考工具

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JSQ extends JFrame implements ActionListener
{ 
private String name[] = 
{"0","1", "2","+","3","4","5","-","6","7","8","*","9",".","=","/"};
private String extend[] = 
{"x^2","ln","back","sin","cos","tan","√￣","off","清空"};
String s="";
int flag=0; 
double x;
final double pi = 3.14159265358979323846;
private JButton button[] = new JButton[name.length];
private JButton button1[] = new JButton[extend.length]; 
JLabel dis_show = new JLabel("结果:");
JTextField window = new JTextField(12);
public JSQ() 
{ 
super("我的计算器");
setSize(800,1000); 
Container c = getContentPane(); 
c.setLayout(new GridLayout(2,1,0,0)); 
JPanel result = new JPanel();
result.add(dis_show);
result.add(window); 
for(int i= 0;i<extend.length;i++) 
{ button1[i] = new JButton(extend[i]); 
result.add(button1[i]); 
} 
JPanel border = new JPanel();
for(int i= 0;i<name.length;i++) 
{ 
button[i] = new JButton(name[i]); 
border.add(button[i]);
} 
c.add(result); 
c.add(border); 

for(int i= 0;i<name.length;i++) 
{ 
button[i].addActionListener(this); 
} 
for(int i= 0;i<extend.length;i++) 
{ 
button1[i].addActionListener(this); 
} 
show(); 
}
public void actionPerformed(ActionEvent e) 
{ 
if (e.getSource()==button[3]) 
{ 
x=Double.parseDouble(s); 
flag=1; 
window.setText("");
s=""; 
}
else if (e.getSource()==button[7]) 
{ 
x=Double.parseDouble(s); 
flag=2; 
window.setText(""); 
s=""; }
else if (e.getSource()==button[11]) 
{ 
x=Double.parseDouble(s); 
flag=3; 
window.setText(""); 
s=""; 
} 
else if (e.getSource()==button[15]) 
{
x=Double.parseDouble(s); 
flag=4; 
window.setText(""); 
s=""; }
else if (e.getSource()==button[14]) 
{ 
switch(flag) 
{ 
case 1: 
{ 
x=x+Double.parseDouble(s); 
String s=String.valueOf(x); 
window.setText(s); 
break; 
} 
case 2: 
{ 
x=x-Double.parseDouble(s); 
String s=String.valueOf(x); 
window.setText(s); 
break; 
}
case 3: 
{ 
x=x*Double.parseDouble(s); 
String s=Double.toString(x); 
window.setText(s);
break; } 
case 4: { 
if(Double.parseDouble(s)==0) 
{
window.setText("除数不能为0"); 
break; 
} 
x=x/Double.parseDouble(s); 
String s=String.valueOf(x); 
window.setText(s); 
break; 
} 
} 
} 
else if(e.getSource()==button1[2]) 
{ 
StringBuffer str = new StringBuffer(window.getText()); 
int n=str.length();
int m=n-1; 
s = String.valueOf(str.delete(m,n)); 
window.setText(s); }
else if(e.getSource()==button1[8]) 
{ 
window.setText(""); 
s=""; 
flag=0; 
} 
else if(e.getSource()==button1[0])
{ x=Double.parseDouble(s); 
x=x*x; 
String s=String.valueOf(x);
window.setText(s); }
else if(e.getSource()==button1[1]) 
{ x=Math.log(Double.parseDouble(s));
String s=String.valueOf(x); 
window.setText(s); } 
else if(e.getSource()==button1[3]) 
{ x=Math.sin(Double.parseDouble(s)*pi/180); 
String s=String.valueOf(x);
window.setText(s); } 
else if(e.getSource()==button1[6]) 
{ x=Math.sqrt(Double.parseDouble(s)); 
String s=String.valueOf(x);
window.setText(s); } 
else if(e.getSource()==button1[4]) 
{ x=Math.cos(Double.parseDouble(s)*pi/180);
String s=String.valueOf(x);
window.setText(s); } 
else if(e.getSource()==button1[5]) 
{ 
x=Math.tan(Double.parseDouble(s)*pi/180); 
String s=String.valueOf(x); 
window.setText(s); } 
else if(e.getSource()==button1[7]) 
{ System.exit(0); 
} else 
{ 
s=s+e.getActionCommand();
window.setText(s); 
} } 
public static void main(String[] args)
{ 
JSQ bun = new JSQ(); 
bun.addWindowListener(new WindowAdapter() 
{ 
public void windowListener(WindowEvent e)
{System.exit(0); } }); }}