sumtextfields.java

JAVA程序设计的一些小程序

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class SumTextFields extends JFrame

implements ActionListener {
	private JTextField number1Field,number2Field,sumField;
	private JLabel equalsLabel;
	private JButton plusButton;
	
	public static void main(String[] args){
		SumTextFields frame=new SumTextFields();
		frame.setSize(350,300);
		frame.createGUI();
		frame.show();
	}
	private void createGUI(){
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		Container window=getContentPane();
		window.setLayout(new FlowLayout());
		
		number1Field=new JTextField(7);
		window.add(number1Field);
		
		plusButton=new JButton("+");
		window.add(plusButton);
		plusButton.addActionListener(this);
		
		number2Field=new JTextField(7);
		window.add(number2Field);
		
		equalsLabel=new JLabel("=");
		window.add(equalsLabel);
		
		sumField=new JTextField(7);
		window.add(sumField);
	}
	public void actionPerformed(ActionEvent event){
		int number1=Integer.parseInt(number1Field.getText());
		int number2=Integer.parseInt(number2Field.getText());
		sumField.setText(Integer.toString(number1+number2));
	} 
}