计算器

/**
 *
 */
package Lyt;
import javax.swing.JFrame;

/**
 * @author Administrator
 *
 */
public class lyt {

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  TextPanel frame=new TextPanel();
  frame.setTitle("计算器");
  frame.setSize(172, 180);
  frame.setLocationRelativeTo(null);
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.setVisible(true);
 }

}

 

 

 

 

/**
 *
 */
package Lyt;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
/**
 * @author Administrator
 *
 */
public class TextPanel extends JFrame{
 /**
  * @param args
  */
 JTextField l1=new JTextField("");
 JButton b0=new JButton("0");
 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 b10=new JButton("+");
 JButton b11=new JButton("-");
 JButton b12=new JButton("*");
 JButton b13=new JButton("/");
 JButton b14=new JButton("=");
 JButton b15=new JButton("."); 
 double []sum0=new double[2]; 
 double sum=0;
 int i=0,n=0;String str="";
 public TextPanel()
 {
  for(int j=0;j<2;j++)
       sum0[j]=0;
  JPanel p1=new JPanel();
  p1.setLayout(new GridLayout(4,4));
  p1.add(b1);
  p1.add(b2);
  p1.add(b3);
  p1.add(b10);
  p1.add(b4);
  p1.add(b5);
  p1.add(b6);
  p1.add(b11);
  p1.add(b7);
  p1.add(b8);
  p1.add(b9);
  p1.add(b12);
  p1.add(b15);
  p1.add(b0); 
  p1.add(b14);
  p1.add(b13);  
  add(p1,BorderLayout.EAST);
  add(l1,BorderLayout.NORTH);
  b1.addActionListener(new ButtonListener());
  b2.addActionListener(new ButtonListener());
  b3.addActionListener(new ButtonListener());
  b4.addActionListener(new ButtonListener());
  b5.addActionListener(new ButtonListener());
  b6.addActionListener(new ButtonListener());
  b7.addActionListener(new ButtonListener());
  b8.addActionListener(new ButtonListener());
  b9.addActionListener(new ButtonListener());
  b10.addActionListener(new ButtonListener());
  b11.addActionListener(new ButtonListener());
  b12.addActionListener(new ButtonListener());
  b13.addActionListener(new ButtonListener());
  b14.addActionListener(new ButtonListener());
  b15.addActionListener(new ButtonListener());  
 } 
 private class ButtonListener implements ActionListener {
  
  @Override
  public void actionPerformed(ActionEvent e) {
   // TODO Auto-generated method stub
   
   if(e.getSource()==b1)
   {str=str+"1";
    l1.setText(String.format("%s", str));
    sum0[i]=Double.parseDouble(l1.getText());
   }
   if(e.getSource()==b0)
   {str=str+"0";
    l1.setText(String.format("%s", str));
    sum0[i]=Double.parseDouble(l1.getText());
   }
   if(e.getSource()==b2)
   {str=str+"2";
    l1.setText(String.format("%s", str));
    sum0[i]=Double.parseDouble(l1.getText());
   }
   if(e.getSource()==b3)
   {str=str+"3";
    l1.setText(String.format("%s", str));
    sum0[i]=Double.parseDouble(l1.getText());
   }
   if(e.getSource()==b4)
   {str=str+"4";
    l1.setText(String.format("%s", str));
    sum0[i]=Double.parseDouble(l1.getText());
   }
   if(e.getSource()==b5)
   {str=str+"5";
    l1.setText(String.format("%s", str));
    sum0[i]=Double.parseDouble(l1.getText());
   }
   if(e.getSource()==b6)
   {str=str+"6";
    l1.setText(String.format("%s", str));
    sum0[i]=Double.parseDouble(l1.getText());
   }
   if(e.getSource()==b7)
   {str=str+"7";
    l1.setText(String.format("%s", str));
    sum0[i]=Double.parseDouble(l1.getText());
   }
   if(e.getSource()==b8)
   {str=str+"8";
    l1.setText(String.format("%s", str));
    sum0[i]=Double.parseDouble(l1.getText());
    }
   if(e.getSource()==b9)
   {str=str+"9";
    l1.setText(String.format("%s", str));
    sum0[i]=Double.parseDouble(l1.getText());
    }
   if(e.getSource()==b10)   //+
   {
    str="";
    n=10;
    i++;
    l1.setText(String.format("%s", str));
    //sum0[i++]=Double.parseDouble(l1.getText());
   }
   if(e.getSource()==b11)   //-
   {
    n=11;
    i++;
    str="";
    l1.setText(String.format("%s", str));
    //sum0[i++]=Double.parseDouble(l1.getText());
   }
   if(e.getSource()==b12)  //*
   {
    n=12;
    i++;
    str="";
    l1.setText(String.format("%s", str));
    //sum0[i++]=Double.parseDouble(l1.getText());
   }
   if(e.getSource()==b13)  ///
   {
    n=13;
    i++;
    str="";
    l1.setText(String.format("%s", str));
   // sum0[i++]=Double.parseDouble(l1.getText());
   }
   if(e.getSource()==b14)  //=
   {
    if(n==10)
      sum=sum0[0]+sum0[1];
    else if(n==11)
       sum=sum0[0]-sum0[1];
    else if(n==12)
       sum=sum0[0]*sum0[1];
    else if(n==13)
       sum=sum0[0]*1.0/sum0[1];    
    l1.setText(String.format("%.2f", sum));
    sum=0;
    sum0[0]=0;
    sum0[1]=0;
    i=0;
    str="";
   }
    if(e.getSource()==b15)  //.
   {
    //sum0=Double.parseDouble(l1.getText());
    str=str+".";
    l1.setText(String.format("%s", str));
    sum0[i]=Double.parseDouble(l1.getText());
   }
   
  }
  
 }
}