5.31java

 

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class Calculator extends JFrame implements ActionListener
{
    JTextField Display = new JTextField(16);
    JButton[] btn = new JButton[10];
    JButton btnPlus = new JButton("  +  ");
    JButton btnMinus = new JButton("  -  ");
    JButton btnMultiply = new JButton("  *  ");
    JButton btnDivide = new JButton("  /  ");
    JButton btnEqual = new JButton("  =  ");
    int num1=0,num2=0,num3=0,count1=0,count2=0;
    int operator=0;
    Calculator()
    {
    for(int i=0;i <btn.length;i++)
    {
      btn[i] = new JButton("  "+String.valueOf(i)+"  ");
    }
    setSize(220,300);
    setTitle("Calculator");
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    validate();
    setLayout(new FlowLayout());
    add(Display);
    Display.setEditable(false);
    for(int i=0;i<10;i++)
    {
    add(btn[i]);
    btn[i].addActionListener(this);
    }
    add(btnPlus);add(btnMinus);add(btnMultiply);add(btnDivide);add(btnEqual);
    btnPlus.addActionListener(this);
    btnMinus.addActionListener(this);
    btnMultiply.addActionListener(this);
    btnDivide.addActionListener(this);
    btnEqual.addActionListener(this);
    setVisible(true);
    }
public void actionPerformed(ActionEvent A)
{
        int i=0;
        count1++;
        if(A.getSource()!=btnPlus&&A.getSource()!=btnMinus&&A.getSource()!=btnMultiply
        &&A.getSource()!=btnDivide&&A.getSource()!=btnEqual)
        {
            while(i<10)
            {
                if(A.getSource()==btn[i])
                {
                    num1=i;
                    if(count1>1)
                    {
                        num1=num2*10+i;
                    }
                    i=10;
                }
                i++;
            }
            num2=num1;
            Display.setText(""+num1);
        }
        else if(A.getSource()==btnPlus)
        {
            if(count2==0)
            {
            num3=num1;
            num2=0;
            operator=1;
            count2++;
            }
            else 
            {
            num3+=num1;
            num2=0;
            count2++;
            operator=1;
            }
        }
        else if(A.getSource()==btnMinus)
        {
            if(count2==0)
            {
            num3=num1;
            num2=0;
            operator=2;
            count2++;
            }
            else 
            {
            num3-=num1;
            num2=0;
            count2++;
            operator=2;
            }
        }
        else if(A.getSource()==btnMultiply)
        {
            if(count2==0)
            {
            num3=num1;
            num2=0;
            operator=3;
            count2++;
            }
            else 
            {
            num3*=num1;
            num2=0;
            count2++;
            operator=3;
            }
        }
        else if(A.getSource()==btnDivide)
        {
            if(count2==0)
            {
            num3=num1;
            num2=0;
            operator=4;
            count2++;
            }
            else 
            {
            num3/=num1;
            num2=0;
            operator=4;
            count2++;
            }
        }
        else if(A.getSource()==btnEqual)
        {
            switch(operator)
            {
                case 1:
                num3+=num1;
                num1=0;
                break;
                case 2:
                num3-=num1;
                num1=0;
                break;
                case 3:
                num3*=num1;
                num1=1;
                break;
                case 4:
                num3/=num1;
                num1=0;
                break;
                case 5:
                case 6:
                case 7:
                case 8:
                case 9:
                case 0:
                break;
            }
            Display.setText(""+num3);
            count1=0;
            count2=0;
        }
}


    public static void main(String[] args)
    {
        new Calculator();
    }
}

 

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;
public class ccc {
    int a,b;
    JFrame f;
    JPanel p;
    JTextField t1,t2,t3; 
    JButton b1,b2;
    GridLayout g;
    JLabel l1,l2,l3,l4;
    public ccc(){
    f = new JFrame();
    p = new JPanel();
    b1 = new JButton("求和");
    b1.addActionListener(new ActionListener(){
        @Override
        public void actionPerformed(ActionEvent e) {
            a = Integer.parseInt (t1.getText());
            b = Integer.parseInt (t2.getText());
            int c = (a+b);
            t3.setText(""+c);
        }
});
    b2 = new JButton("清除");
    b2.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e) {
            t1.setText("");
            t2.setText("");
            t3.setText("");
        }
});
    t3 = new JTextField(10);
    l1 = new JLabel("加数1");
    l3 = new JLabel("");
    l4 = new JLabel("");
    t1 = new JTextField(10);    
    l2 = new JLabel("加数2");
    t2 = new JTextField(10);
     g = new GridLayout(3,3);
     p.setLayout(g);                           
     f.setSize(400, 300);;
     f.add(p);
     p.add(b1);p.add(b2);
     p.add(l1);p.add(l2);
     f.setVisible(true);
     p.add(l1);p.add(t1);p.add(l3);
     p.add(l2); p.add(t2);p.add(l4);
     p.add(b1);p.add(t3);p.add(b2);                              
     }
     public static void main(String[] args) {
       new ccc();
     }
}