从另一个 Applet 启动另一个 Applet [英] Launching another Applet from another Applet

问题描述

我制作了一个加载器小程序来迎接用户，当用户单击该小程序上显示的按钮时，它会启动主小程序并销毁加载器小程序.

I have made a Loader Applet which greets the user and when user clicks the button displayed on that Applet it then launches the main applet and the Loader Applet is destroyed.

但是点击另一个小程序没有启动！

But on clicking Another applet is not launched !

加载程序小程序:

import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JApplet;

public class Loader extends JApplet implements ActionListener{
    Display secondApplet;
    Button button;

    @Override
    public void init() {
        setSize(800,600);
    }

    @Override
    public void start() {
        setLayout(new FlowLayout());
        button = new Button ("Click me !!");
        add(button);
        button.addActionListener(this);
    }

    @Override
    public void paint(Graphics g) {

    }

    @Override
    public void actionPerformed(ActionEvent e) {
        secondApplet = (Display)getAppletContext().getApplet("Display");
        if (secondApplet != null) {
            secondApplet.init();
            secondApplet.start();
        }
        else {
            System.out.println("Not Running\n");
        }
    }
}

显示小程序:

import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JApplet;

public class Display extends JApplet {

    @Override
    public void init() {
        setSize(600,400);
    }

    @Override
    public void paint(Graphics g) {
        g.fillRect(0, 0, this.getWidth(), this.getHeight());
    }
}

如何创建另一个Applet的实例并销毁当前Applet！！

推荐答案

由于 Applet/JApple 本身就是一个 java.awt.Panel，那么您可以针对您的特定情况将一个嵌入到另一个中如果您可以使用 Loader 中的面板将 Display 嵌入 Loader 以根据需要重新加载 Display.

Since an Applet/JApple is a java.awt.Panel itself, then you can embed one into the other, for your specific case you can embed Display into Loader using a Panel in Loader to reload Display as you need.

像这样:

Panel container = new Panel();
container.setLayout(new GridLayout(1,0));
container.add(secondApplet); //Display Applet
add(container):

secondApplet.init();
secondApplet.start();

button.setVisible(false);

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