Sample GUI class in Java

Java is specially designed for GUI programming. So we here start our chapter with making GUI........


To work with GUI we need a main window to work with. In Java we can use JFrame, JApplet, or JPanel  to create GUI. The best practice is to use JFrame.

Here we have a sample class which make a GUI with JFrame....

Sample GUI class in Java :

// package

        package mpc;

//  imports

    import java.awt.Color;

    import javax.swing.*;

    import java.awt.event.*;

// class extends jframe or jpanel

    public class App extends JFrame{

// constructors

    public App() {

    initComp();

    }

// main method

    public static void main(String[] args) {

    new App();

    }

// initComp method

    void   initComp() {

    this.myBtn();

    this.myLbl();

    this.setLayout(null);

    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    this.setResizable(false);

    this.setBounds(10, 10, 300, 350);

    this.setVisible(true);

    }

// 1st component’s method

    void myBtn() {

    btn=new JButton();

    btn.setText("Click");

    btn.setBounds(5, 5, 100, 25);

    btn.setVisible(true);

    this.add(btn);

    btn.addActionListener(new ActionListener(){

    public void actionPerformed(ActionEvent e) {

    myBtnActionPerformed(e);}

    });

    }

// 1^st component’s event handler

    void  myBtnActionPerformed(ActionEvent e){

    lbl.setText("Hello.");

    }

// 2^nd component’s method

    void myLbl() {

    lbl=new JLabel();

    lbl.setText("");

    lbl.setBounds(7, 30, 100, 35);

    lbl.setVisible(true);

    this.add(lbl);

    }

// variable and component dec.

    JLabel lbl;

    JButton btn;

    }

//end of class
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