.Jarcan be run by double-clicking like .exe.

If you want to make .jaras .exe double-click to run it, you need to write a mainfest. MF file.
And
Main-class: Specifies the entry class for the attribute.

If eclipse exists at hand, specify main class when generating. jar, and eclipse will automatically generate related files.
Next we will Package a test project that I just wrote into test. Jar. I hope it will help you.

The following structure is available to open test. jar with WinRAR:

Test. Jar
META-INF
Manifest. MF
Jframe. Class

Jframe. Java

Java code?

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import javax.swing.JFrame;public class jFrame extends JFrame{     /**     * @param args     */    public jFrame()    {        super("Hello World");        setSize(800,600);        setVisible(true);    }    public static void main(String[] args) {        // TODO Auto-generated method stub         jFrame frame=new jFrame();        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    } }

Manifest. MF content:

Manifest-version: 1.0
Main-class: jframe