public class EventObject extends Object implements Serializable{
	public EventObject(Object source){
	// 構(gòu)造一個發(fā)生事件的對象
	}
	public Object getSource(){
	// 返回一個事件對象
	}
	public String toString(){
	// 得到信息
	}
}

Java事件處理流程

窗體事件

WindowListener是專門處理窗體事件的監(jiān)聽接口

方法	作用
void windowActivated(WindowEvent e)	將窗口變?yōu)榛顒哟翱跁r觸發(fā)
void windowDeactivated(WindowEvent e)	將窗口變?yōu)椴换顒哟翱跁r觸發(fā)
void windowClosed(WindowEvent e)	當窗口被關(guān)閉時觸發(fā)
void windowClosing(WindowEvent e)	當窗口正在關(guān)閉時觸發(fā)
void windowIconified(WindowEvent e)	窗口最小化時觸發(fā)
void windowDeiconified(WindowEvent e)	窗口從最小化恢復(fù)到正常狀態(tài)時觸發(fā)
void windowOpened(WindowEvent e)	窗口打開時觸發(fā)

實現(xiàn)WindowListener

import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

public class WindowEventHandle implements WindowListener {
    @Override
    public void windowActivated(WindowEvent e) {
        System.out.println("窗口被選中");
    }

    @Override
    public void windowClosed(WindowEvent e) {
        System.out.println("窗口被關(guān)閉");
    }

    @Override
    public void windowClosing(WindowEvent e) {
        System.out.println("窗口關(guān)閉");
    }

    @Override
    public void windowDeactivated(WindowEvent e) {
        System.out.println("取消窗口選中");
    }

    @Override
    public void windowDeiconified(WindowEvent e) {
        System.out.println("窗口從最小化恢復(fù)");
    }

    @Override
    public void windowIconified(WindowEvent e) {
        System.out.println("窗口最小化");
    }

    @Override
    public void windowOpened(WindowEvent e) {
        System.out.println("窗口被打開");
    }
}

在窗體上注冊事件監(jiān)聽器

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

public class Hello {
    public static void main(String[] args) {
        JFrame frame = new JFrame("一");
        frame.addWindowListener(new WindowEventHandle());
        frame.setSize(500,300);
        frame.setBackground(Color.BLUE);
        frame.setLocation(500,500);
        frame.setVisible(true);
    }
}

監(jiān)聽適配器

方便用戶進行事件處理的實現(xiàn)。以WindowAdapter為例，用戶只要繼承了此類，就可以根據(jù)自己的需要覆寫方法，如果現(xiàn)在只關(guān)心窗口關(guān)閉方法，則只在子類中覆寫windowClosing()方法即可

通過WindowAdapter實現(xiàn)監(jiān)聽

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

public class WindowEventHandle extends WindowAdapter {
    @Override
    public void windowClosing(WindowEvent e) {
        super.windowClosing(e);
        System.out.println("窗口關(guān)閉");
        System.exit(1);
    }
}

而在窗體操作的代碼中，直接使用以上的監(jiān)聽器類即可

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

public class Hello {
    public static void main(String[] args) {
        JFrame frame = new JFrame("一");
        frame.addWindowListener(new WindowEventHandle());
        frame.setSize(500,300);
        frame.setBackground(Color.BLUE);
        frame.setLocation(500,500);
        frame.setVisible(true);
    }
}

使用匿名內(nèi)部類

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

public class Hello {
    public static void main(String[] args) {
        JFrame frame = new JFrame("一");
        frame.addWindowListener(new WindowEventHandle(){
            @Override
            public void windowClosing(WindowEvent e) {
                super.windowClosing(e);
                System.exit(1);
            }
        });
        frame.setSize(500,300);
        frame.setBackground(Color.BLUE);
        frame.setLocation(500,500);
        frame.setVisible(true);
    }
}

如果現(xiàn)在使用適配器操作類，則直接編寫匿名內(nèi)部類就可以減少監(jiān)聽類的定義

到此這篇關(guān)于Java 入門圖形用戶界面設(shè)計之事件處理上的文章就介紹到這了,更多相關(guān)Java 事件處理內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

您可能感興趣的文章: