Different between java v/s javac v/s javacpl vs. javaw

javacpl.cpl :

• javacpl.cpl is a java controll panel belonging to an java(TM) Platform SE 6 U5 from Sun Microsystems, Inc.

• Non-system processes like javacpl.cpl originate from software you installed on your system. 

• Since most applications store data in your system's registry.

• To stop javacpl.cpl permanently uninstall 'Java(TM) Platform SE 6 U5' from your system.

javac :

• javac is a compiler program. it compiles java source program [ .java ] into bytecode class file [ .class ]

• To use javac you need to add java bin directory path in your system variable.

• javac is inside the JDK_HOME/bin in java directory in windows.

• How to compile java source program follow the steps.

1. First if you don`t set Environment path then setup. and open "command prompt".
2. press  [ windows key + R ] and type [ cmd ].
3. Now, write javac filename.java

javaw :

• javaw.exe is located in bin directory.
• javaw.exe is very similar to java.exe. It can be considered as a parallel twin. It is a Win32 GUI application.
• his is provided as a helper so that application launches its own GUI window and will not launch a console. Whenever we want to run a GUI based application and don’t require a command console, we can use this as application launcher. Eclipse is used javaw.exe.

import javax.swing.*;

public class HelloWorldSwing {
    private static void createAndShowGUI() {
        JFrame jFrame = new JFrame("HelloWorld Swing");
        jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JLabel helloLabel = new JLabel("Hello World!");
        jFrame.getContentPane().add(helloLabel);
        jFrame.pack();
        jFrame.setVisible(true);
    }

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

• We can execute the above GUI application using both java.exe and javaw.exe If we launch using java.exe, the command-line waits for the application response till it closes. When launched using javaw, the application launches and the command line exits immediately and ready for next command