Java AWT TextField

本文概述

• AWT TextField类声明
• Java AWT TextField示例
• 带有ActionListener的Java AWT TextField示例

TextField类的对象是允许编辑单行文本的文本组件。它继承了TextComponent类。

AWT TextField类声明

public class TextField extends TextComponent

Java AWT TextField示例

import java.awt.*;
class TextFieldExample{
public static void main(String args[]){
    Frame f= new Frame("TextField Example");
    TextField t1, t2;
    t1=new TextField("Welcome to srcmini.");
    t1.setBounds(50, 100, 200, 30);
    t2=new TextField("AWT Tutorial");
    t2.setBounds(50, 150, 200, 30);
    f.add(t1); f.add(t2);
    f.setSize(400, 400);
    f.setLayout(null);
    f.setVisible(true);
}
}

输出：

带有ActionListener的Java AWT TextField示例

import java.awt.*;
import java.awt.event.*;
public class TextFieldExample extends Frame implements ActionListener{
	TextField tf1, tf2, tf3;
	Button b1, b2;
	TextFieldExample(){
		tf1=new TextField();
		tf1.setBounds(50, 50, 150, 20);
		tf2=new TextField();
		tf2.setBounds(50, 100, 150, 20);
		tf3=new TextField();
		tf3.setBounds(50, 150, 150, 20);
		tf3.setEditable(false);	
		b1=new Button("+");
		b1.setBounds(50, 200, 50, 50);
		b2=new Button("-");
		b2.setBounds(120, 200, 50, 50);
		b1.addActionListener(this);
		b2.addActionListener(this);
		add(tf1);add(tf2);add(tf3);add(b1);add(b2);
		setSize(300, 300);
		setLayout(null);
		setVisible(true);
	}		
	public void actionPerformed(ActionEvent e) {
		String s1=tf1.getText();
		String s2=tf2.getText();
		int a=Integer.parseInt(s1);
		int b=Integer.parseInt(s2);
		int c=0;
		if(e.getSource()==b1){
			c=a+b;
		}else if(e.getSource()==b2){
			c=a-b;
		}
		String result=String.valueOf(c);
		tf3.setText(result);
	}
public static void main(String[] args) {
	new TextFieldExample();
}
}

输出：