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In the manifest file of a JAR, it is possible to specify the class to be used when the JVM is
lauched with the JAR as parameter. The class must have a main().
Try with this simple class:
import java.awt.*;
import java.awt.event.*;
public class MyClass {
public static void main(String[] args) {
Frame f = new Frame();
f.addWindowListener
(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
}
);
f.add(new Label("Hello world"));
f.setSize(200,200);
f.setVisible(true);
}
}
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Then create this manifest file (manifest.mft) with any text editor.
Manifest-Version: 1.0
Main-Class: MyClass
Classpath: .\MyJar.jar
Next, you include the manifest file in the JAR (MyJar.jar) with the MyClass class.
jar cvfm MyJar.jar manifest.mft MyClass.class
Then you are able to start the MyClass.class by double-clicking on the MyJar.jar file
(if the JRE is correctly installed) or by typing
java -jar MyJar.jar
On NT, you can also make JARs run from the command-line by setting the PATHEXT environment variable, for example
set PATHEXT=.EXE;.BAT;.CMD;.JAR
Then if you have the jar file MyJar.jar accessible via the PATH environment variable, typing "MyJar"
on the DOS command line will invoke "java -jar MyJar.jar" .
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