Java AWT实践：从文本框到窗体事件-优快云博客

本文链接：https://blog.youkuaiyun.com/m0_55689329/article/details/117699340

这篇博客介绍了Java AWT的基础知识，包括AWT介绍、文本框和密码框的设置、文本域操作、鼠标键盘事件以及窗体事件的处理。通过实例代码展示了如何创建和操作这些组件，帮助读者理解Java图形用户界面的基本用法。

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AWT

一、AWT介绍

•
•
•使用AWT所涉及的类
•Container和component是AW T中的两个核心类

文本框的设置

package Demo01;

import java.awt.BorderLayout;
import java.awt.Container;

import javax.swing.JFrame;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.WindowConstants;

public class TestTextDemo01 extends JFrame {
public TestTextDemo01() {

	Container container=this.getContentPane();
	
	JTextField textfield=new JTextField("Hello");
	JTextField textfield2=new JTextField("No");
	
	
	container.add(textfield,BorderLayout.NORTH);
	container.add(textfield,BorderLayout.SOUTH);
	
	
	
	this.setVisible(true);
	this.setSize(500,300);
	this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}


public static void main(String[] args) {
	new TestTextDemo01();
	
}

}

密码框的设置

package Demo01;

import java.awt.BorderLayout;
import java.awt.Container;

import javax.swing.JFrame;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.WindowConstants;

public class TestTextDemo02 extends JFrame {
public TestTextDemo02() {

	Container container=this.getContentPane();
	
	JPasswordField passwordField=new JPasswordField();
	passwordField.setEchoChar('*'); 
	
	JTextField textfield=new JTextField("Hello");
	JTextField textfield2=new JTextField("No");
	
	
	container.add(textfield,BorderLayout.NORTH);
	container.add(textfield,BorderLayout.SOUTH);
	
	
	
	this.setVisible(true);
	this.setSize(500,300);
	this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}


public static void main(String[] args) {
	new TestTextDemo02();
	
}

}

package Demo02;

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.WindowConstants;

public class TextActionEvent {
public static void main(String[] args) {
JFrame frame=new JFrame();
frame.setSize(400,300);
frame.locate(400, 400);

	MyActionListener myActionListener=new MyActionListener();
	Button button=new Button();
	//添加事件
	button.addActionListener(myActionListener);
	frame.add(button,BorderLayout.CENTER);
	frame.pack();
	frame.setVisible(true);
	frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
	
}

}
//创建一个类
class MyActionListener implements ActionListener{

@Override
public void actionPerformed(ActionEvent e) {
	System.out.println("大数据5");	
}

}
package Demo02;

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.WindowConstants;

public class TextActionTwo {
public static void main(String[] args) {
JFrame frame=new JFrame(“开始–停止”);
frame.setSize(400,300);
frame.locate(400, 400);
Button button1=new Button(“start”);
Button button2=new Button(“stop”);

	MyMoniter myMonitor=new MyMoniter();
	
	button1.addActionListener(myMonitor);
	button2.addActionListener(myMonitor);
	
	frame.add(button1,BorderLayout.NORTH);
	frame.add(button2,BorderLayout.SOUTH);
	frame.pack();
	frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}

}
class MyMoniter implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
//System.out.println(“大数据5”+e.getActionCommand());
if(e.getActionCommand().equals(“stop”)) {
System.out.println(“下班”);
}else {
System.out.println(“工作”);
}
}
}

文本域的设置

package Demo02;
//事件文本域
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;

public class TextText01 {
public static void main(String[] args) {
new MyFrame();

}

class MyFrame extends JFrame{
public MyFrame() {
//文本框
TextField textField=new TextField();
this.add(textField);

	MyActionListener2 myActionListener2=new MyActionListener2();
	textField.addActionListener(myActionListener2);
	
	textField.setEchoChar('%');
	
	this.setVisible(true);
	this.pack();
	this.setDefaultCloseOperation(EXIT_ON_CLOSE);
	}

}
class MyActionListener2 implements ActionListener{

@Override
public void actionPerformed(ActionEvent e) {
	TextField field =(TextField)e.getSource();
	
	System.out.println(field.getText());
	field.setText("");
}

}

鼠标键盘的设置

package Demo03;

import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

import javax.swing.JFrame;

//鼠标键盘
public class TestKeyList {
public static void main(String[] args) {
new KeyFrame();
}
}
class KeyFrame extends JFrame{
public KeyFrame() {

	this.setBounds(10,10,300,400);
	this.setVisible(true);
	this.setDefaultCloseOperation(EXIT_ON_CLOSE);
	
	this.addKeyListener(
	   new KeyAdapter() {
		 
		public void keyPassed(KeyEvent e) {
			int keycode=e.getKeyCode();
			System.out.println(keycode);
			
			if(keycode==KeyEvent.VK_UP) {
				System.out.println("您按下了上键盘");
			}
			if(keycode==KeyEvent.VK_W) {
				System.out.println("您按下了w键盘");
			}
		}
		
	});
}

}

package Demo03;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;

import javax.swing.JFrame;
import javax.swing.text.html.HTMLDocument.Iterator;

public class TestMouseListener {
public static void main(String[] args) {
new MyFrame(“我的画图”);
}

}
class MyFrame extends JFrame{
ArrayList points;
public MyFrame(String title) {
super(title);
this.setBounds(400, 400, 400, 400);
this.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
points=new ArrayList<>();
this.addMouseListener(new MyMouseListener());
}
public void paint(Graphics g) {
java.util.Iterator iterator=points.iterator();
while(iterator.hasNext()) {
Point point=(Point)iterator.next();
g.setColor(Color.cyan);
g.fillOval(point.x, point.y, 10, 20);
}
}
public void addPaint(Point point) {
points.add(point);
}
private class MyMouseListener extends MouseAdapter{
@Override
public void mousePressed(MouseEvent e) {
MyFrame myFrame=(MyFrame)e.getSource();
System.out.println(“x坐标：”+e.getX()+“y坐标：”+e.getY());
myFrame.addPaint(new Point(e.getX(),e.getY()));
myFrame.repaint();
}

}

窗体事件

package Demo03;

import java.awt.Color;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;

//窗体事件
public class TestWindow {
public static void main(String[] args) {
new WindowFrame();
}

}
class WindowFrame extends JFrame{
public WindowFrame() {
this.setBackground(Color.red);
this.setBounds(100,100,200,200);
this.setVisible(true);//可见
//this.setDefaultCloseOperation(EXIT_ON_CLOSE);//关闭事件
//this.addWindowListener(new MyWindowListener());

	this.addWindowListener(
	**匿名内部类**
	//匿名内部类
			new WindowAdapter() {
				@Override
				public void windowClosing(WindowEvent e) {
					// TODO 自动生成的方法存根
					super.windowClosing(e);
					
					setVisible(false);//设置不可见
					System.out.println("我要关闭");
					//System.exit(0);
				}
				@Override
				public void windowActivated(WindowEvent e) {
					// TODO 自动生成的方法存根
					super.windowActivated(e);
					System.out.println("windowActivated");
			}
			});
	
}
**内部类**
/*内部类
class MyWindowListener extends WindowAdapter{
	//按住alt+/
	@Override
	public void windowClosing(WindowEvent e) {
		// TODO 自动生成的方法存根
		super.windowClosing(e);
		
		setVisible(false);//设置不可见
		System.out.println("我要关闭");
		System.exit(0);

}