jiafa.java

有界面的用于程序加法 输入数字按按钮直接求和

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class jiafa implements ActionListener{
	JTextField j1,j5,j3;JButton j2,j4;
	public jiafa(){
		JFrame fr=new JFrame("sum");
		fr.setLayout(new FlowLayout());
		fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		fr.setSize(333,88);
		Container c=fr.getContentPane();
		j1=new JTextField(5);
		j2=new JButton("+");
		j3=new JTextField(5);
		j4=new JButton("=");
		j5=new JTextField(5);
		c.add(j1);c.add(j2);c.add(j3);c.add(j4);c.add(j5);
		j4.addActionListener(this);
		fr.setVisible(true);
	}
	
	public void actionPerformed(ActionEvent e)
	{
	int a=Integer.parseInt(j1.getText());	
	int b=Integer.parseInt(j3.getText());
	int c=0;
	if(e.getSource()==j4)
		{
		c=a+b;
		}
	j5.setText(String.valueOf(c));
	}
public static void main(String args[])
{
	jiafa j=new jiafa();
}


}