Creating your own appletviewer

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To create your own appletviewer, you would need to write a Java program that can interpret and execute Java applets. Here are the basic steps to create your own appletviewer:

  1. Create a Java program: First, create a Java program that will be your appletviewer. This program should be able to display Java applets and execute them.
  2. Import necessary packages: Import the necessary Java packages that will be needed to execute Java applets, such as the java.applet and java.awt packages.
  3. Create a container: Create a container, such as a JFrame, that will hold the appletviewer and display the applet.
  4. Load the applet: Load the Java applet into the appletviewer using the Applet class.
  5. Set up the appletviewer: Set up the appletviewer by setting its size, location, and other properties.
  6. Execute the applet: Finally, execute the applet using the appletviewer.

Here is an example code snippet to get you started:

import java.applet.*;
import java.awt.*;

public class MyAppletViewer extends Frame {
  public MyAppletViewer(String title) {
    super(title);
    setSize(400, 400);
    setLocation(100, 100);
    setVisible(true);
  }

  public static void main(String[] args) {
    MyAppletViewer appletViewer = new MyAppletViewer("My Applet Viewer");
    Applet applet = new MyJavaApplet();
    appletViewer.add(applet);
    applet.init();
    applet.start();
  }
}

In this example, the MyAppletViewer class extends the Frame class, which allows us to create a container to hold the applet. We set the size and location of the appletviewer and make it visible.

We then create an instance of the MyJavaApplet class, which is the Java applet that we want to execute. We add the applet to the appletviewer using the add() method, and then initialize and start the applet using the init() and start() methods.

Of course, this is just a basic example, and you would need to modify it to suit your specific needs. You may want to add additional features to your appletviewer, such as the ability to open and display multiple applets at the same time, or the ability to save applets for future use.

Example that works like appletviewer tool:

Here is an example program that works like the appletviewer tool:

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

public class MyCustomAppletViewer extends Frame implements ActionListener {
    private TextArea textArea;
    private Button loadButton;
    private Applet applet;

    public MyCustomAppletViewer() {
        super("My Custom Applet Viewer");
        setSize(600, 400);
        setLocation(100, 100);

        textArea = new TextArea();
        textArea.setEditable(false);

        loadButton = new Button("Load Applet");
        loadButton.addActionListener(this);

        add(textArea, BorderLayout.CENTER);
        add(loadButton, BorderLayout.SOUTH);

        setVisible(true);
    }

    public void actionPerformed(ActionEvent event) {
        if (event.getSource() == loadButton) {
            try {
                URL url = new URL(textArea.getText().trim());
                applet = (Applet) Class.forName(url.getFile().replace(".class", "")).newInstance();
                applet.init();
                applet.start();

                add(applet, BorderLayout.NORTH);
                validate();
            } catch (Exception e) {
                textArea.append("Error loading applet: " + e.getMessage() + "\n");
            }
        }
    }

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

This program creates a custom applet viewer window with a text area for entering the URL of a Java applet and a button for loading the applet. When the user clicks the “Load Applet” button, the program loads the applet from the specified URL and adds it to the top of the window.

The program uses the java.net.URL class to parse the URL entered by the user and obtain the name of the applet class. It then uses reflection to dynamically create an instance of the applet class and invoke its init() and start() methods.

Note that this program is a simplified example and may not work with all Java applets. Some applets may require additional resources or configuration to run properly, such as security permissions or applet parameters.