import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class Calc extends JFrame implements ActionListener
{
static int i=0;
JButton jb1=new JButton("0");
JButton jb2=new JButton("1");
JButton jb3=new JButton("2");
JButton jb4=new JButton("3");
JButton jb5=new JButton("4");
JButton jb6=new JButton("5");
JButton jb7=new JButton("6");
JButton jb8=new JButton("7");
JButton jb9=new JButton("8");
JButton jb10=new JButton("9");
JButton jb11=new JButton("+");
JButton jb12=new JButton("-");
JButton jb13=new JButton("=");
JLabel jl=new JLabel("答案是多少");
JPanel jp=new JPanel();
GridLayout gl=new GridLayout(5,2);
public Calc()
{
this.setTitle("简易计算器");
jp.setLayout(gl);
jp.add(jb1);
jp.add(jb2);
jp.add(jb3);
jp.add(jb4);
jp.add(jb5);
jp.add(jb6);
jp.add(jb7);
jp.add(jb8);
jp.add(jb9);
jp.add(jb10);
jp.add(jb11);
jp.add(jb12);
jp.add(jb13);
jp.add(jl);
jb1.addActionListener(this);
jb2.addActionListener(this);
jb3.addActionListener(this);
jb4.addActionListener(this);
jb5.addActionListener(this);
jb6.addActionListener(this);
jb7.addActionListener(this);
jb8.addActionListener(this);
jb9.addActionListener(this);
jb10.addActionListener(this);
jb11.addActionListener(this);
jb12.addActionListener(this);
jb13.addActionListener(this);
this.add(jp);
this.setBounds(300,200,500,300);
this.setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==jb1)
{
jl.setText("0");
i=0;
}
if(e.getSource()==jb2)
{
jl.setText("1");
i=1;
}
if(e.getSource()==jb3)
{
jl.setText("2");
i=2;
}
if(e.getSource()==jb4)
{
jl.setText("3");
i=3;
}
if(e.getSource()==jb5)
{
jl.setText("4");
i=4;
}
if(e.getSource()==jb6)
{
jl.setText("5");
i=5;
}
if(e.getSource()==jb7)
{
jl.setText("6");
i=6;
}
if(e.getSource()==jb8)
{
jl.setText("7");
i=7;
}
if(e.getSource()==jb9)
{
jl.setText("8");
i=8;
}
if(e.getSource()==jb10)
{
jl.setText("9");
i=9;
}
if(e.getSource()==jb11)
{
jl.setText(i+"+");
}
if(e.getSource()==jb12)
{
jl.setText(i+"-");
}
if(e.getSource()==jb13)
{