How does Java run Applets? Two ways to run Applet-javaTutorial-php.cn

How does Java run Applets? Two ways to run Applet

青灯夜游

Release： 2018-12-24 14:12:00

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Applet is a small dynamic Java program, so how to run Applet? This article will introduce Applet to you, let you know what Applet is, and how to run Applet. I hope it will be helpful to you.

How does Java run Applets? Two ways to run Applet

What is a Java applet?

#An applet is a small dynamic Java program that can be embedded in HTML code, transmitted over the Internet and run by a Java-compatible web browser, working on the client computer.

Note:

1. Applets are usually executed in AppletViewer or a Java-compatible web browser.

2. All applets are subclasses of the java.applet.Applet class (directly or indirectly) and will import the java.awt package, and these subclasses must be declared as "public".

3. The execution of an applet usually does not start from the main() method.

How to run Applet?

We can run Applet in two ways. Let’s introduce these two ways:

1, is compatible with Java Execute the applet in your web browser.

We can embed the applet into the HTML code, run the html file, and then execute the applet in a Java-compatible web browser

Example: First create an applet and compile it

//First.java  
import java.applet.Applet;  
import java.awt.Graphics;  
public class First extends Applet{  
public void paint(Graphics g){  
g.drawString("Hello World",150,150);  
}  
}

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Note: The class must be declared as "public" because its code will be accessed by code located outside the program.

Then create the hello.html file and put the applet code in the html file: include a label for loading the applet (applet label or object label)

<html>  
<body>  
<applet code="First.class" width="300" height="300"></applet>  
</body>  
</html>

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The width and height statements specify the applet to use The size of the display area. The applet tag contains several other options. All that is required to execute this file in a web browser is to load the hello.html file in the web browser and then execute the applet.

2. Through the appletViewer tool

we can execute applet in appletviewer. This is the simplest way to run applet. It is mainly used for testing.

Example 1: Execute the following command in the appletviewer, run the hello.html of the above example, to execute the applet

appletviewer hello.html

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Example 2: First create an applet containing the applet tag in the comment and execute Compile

//First.java  
import java.applet.Applet;  
import java.awt.Graphics;  
public class First extends Applet{  
  
public void paint(Graphics g){  
g.drawString("HelloWorld",150,150);  
}  
}
/ * 
<applet code =“First.class”width =“300”height =“300”> 
</ APPLET> 
* /

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and then run the command:

appletviewer First.java

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Note: If we want to execute the applet through the appletviewer tool, we need to pass the command at the command prompt:

c:\>javac First.java
c:\>appletviewer First.java

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