Skip to main content

Eclipse Java IDE

This tutorial consists of;

  • Downloading and installing ECLIPSE
  • Example 1: Creating Hello World for console
  • Example 2: Java project using JFrame
  • Example 3: Applet project
  • EXAMPLE 4: Toggle Breakpoints and Debug mode

DOWNLOAD JDK: First, make sure latest JDK installed, download here (currently we have JDK1.8)http://www.oracle.com/technetwork/java/javase/downloads/

Shortcut link http://bit.ly/keruleclipse

JDK Installation is damn easy, double click the downloaded EXE file, and continue.

download-jdk

DOWNLOAD ECLIPSE: Should you prefer the latest version, download here –> http://www.eclipse.org/downloads/eclipse-packages/
choose either 32bit or 64bit suitable to you Windows version. The current Eclipse version is codenamed NEON, as the writing of this tutorial.

download-eclipse-neon

Copy the downloaded zip file to you harddisk. Right click and extract here.

extract eclipse-zip

Locate the eclipse folder, and double-click eclipse.exe to run the application.

eclipse-exe

readmorebutton

EXAMPLE 1: Creating Hello World project for console

Go to menu; File->New-> Java project.

new-project

Provide the project name. Click FINISH button.

new Hello project

Open the project navigation, locate SRC folder.

Right-click –> New –> Class.

new-class

Provide the package name. Use the reverse domain as suggested in Java convention.

Provide the class name which start with capital letter.

Choose to have the main method. And hit FINISH…

new-class-details

Write the Java code, example System.out.println(“Hello World”);. Save and hit the RUN button. You’ll see the output in the console below.

console-running-hello-world

EXAMPLE 2: Project with JFrame

Create a project, and a class as similar to EXAMPLE 1. Write your code containing the JFrame API (or copy & paste codes below). Hit RUN, and the output of the program will be displayed in Window.

example-with-JFrame

Code sample with JFrame

package net.kerul.hello;

import javax.swing.*;//the JFrame class resides here
import java.awt.*;
import java.awt.event.*;

//JFrame superclass//FrameButang subclass
class Hello extends JFrame implements ActionListener{

    private JButton btnMerah, btnBiru;//declare buttons *****
    //constructor
    public Hello() {
        //buttons
        btnMerah=new JButton("Merah");
        btnMerah.addActionListener(this);
        //biru *****
        btnBiru=new JButton("Biru");
        btnBiru.addActionListener(this);

        Container p1 = getContentPane();
        p1.setLayout(new FlowLayout());
        p1.setBackground(Color.white);
        //draw GUIs
        p1.add(btnMerah);
        p1.add(btnBiru);//btn biru *****
    }//end FrameButang

    public static void main(String [] args) {
        //initiate jframe
        Hello frame = new Hello();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setTitle("Kerul: HELLO");//window title
        frame.setSize(400, 300);//widthXheight
        frame.setVisible(true);//show window
    }//end main

    public void actionPerformed(ActionEvent e){
        Container p1 = getContentPane();

        if (e.getActionCommand().equals("Merah"))
            //button Merah clicked
            p1.setBackground(Color.red);
        else if (e.getActionCommand().equals("Biru"))
            //button Biru clicked
            p1.setBackground(Color.blue);
      }//end actionPerformed

}//end class

 

 

EXAMPLE 3: Applet with image and audio

applet-sample-with-audio-image

You may download the code sample here - https://drive.google.com/drive/folders/0B5_Hw_xzXWcXdWtscU12RkFheWc?usp=sharing

To start an applet, similarly create a project and class as in EXAMPLE 1.

Copy and paste the image and audio files to the Java project in Eclipse.

applet-resources

To run the applet in the AppletViewer, go to Run Configurations.

run-configuration-applet

The dimensions of the output Applet can be changed here –> Parameters. Hit Run…

run-configuration-applet-dimension

And you’ll have your applet. All the best…

AppletViewer

Applet code sample

package net.kerul.rabitah;

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

//simple applet example with image and audio (wav)
//by KERUL.net

public class Rabitah extends Applet implements ActionListener{
    Image rabitah;
    Button play,stop;
    AudioClip audioClip;
    public void init(){
        //image handling
        rabitah=getImage(getCodeBase(),"rabitah800x500.jpg");
        //audio handling
        play = new Button("  Play in Loop  ");
        add(play);
        play.addActionListener(this);
        stop = new Button("  Stop  ");
        add(stop);
        stop.addActionListener(this);
        audioClip = getAudioClip(getCodeBase(), "rabitah.wav");
    }//end init
    public void paint (Graphics g){
        g.drawImage(rabitah, 0, 0, 800, 500, this);
       
    }//end paint
    public void actionPerformed(ActionEvent ae){
            Button source = (Button)ae.getSource();
            if (source.getLabel() == "  Play in Loop  "){
                audioClip.play();
        } 
        else if(source.getLabel() == "  Stop  "){
            audioClip.stop();
        }
    }//end actionPerformed
}//end class

 

EXAMPLE 4: Toggle Breakpoints and Debug mode

Right-click on the project Java file, choose Debug As option.

debug-menu

You may apply the Togle Breakpoint at the code’s line number. Watch the variables values, changing value are in yellow.

togle-breakpoint-debug-mode

Code sample for debugging

package net.kerul.tb;

import java.io.*;
public class TB {

    public static void main(String args[]) throws IOException {
        DataInputStream io=new DataInputStream(System.in);
         //List of 15 numbers
        //int numbers[] = new int[10];
        int numbers[]={11,12,13,14,15,16,17,18,19,10,21,22,23,24,25};
       
        //Int of smallest and largest numbers
        int smallest = numbers[0];
        int largest = numbers[0];

        for (int i=0; i<numbers.length; i++){
            //System.out.println("Input number "+(i+1));
            //numbers[i]=Integer.parseInt(io.readLine());

            if(numbers[i] > largest)
                largest = numbers[i];

            if (numbers[i]  < smallest)
                smallest = numbers[i];
        }

        System.out.println("Largest numbers is:"+ largest);
        System.out.println("Smallest numbers is:"+ smallest);

    }//end main
}//end class

Comments

Popular posts from this blog

Several English proverbs and the Malay pair

Or you could download here for the Malay proverbs app – https://play.google.com/store/apps/details?id=net.kerul.peribahasa English proverbs and the Malay pair Corpus Reference: Amir Muslim, 2009. Peribahasa dan ungkapan Inggeris-Melayu. DBP, Kuala Lumpur http://books.google.com.my/books/about/Peribahasa_dan_ungkapan_Inggeris_Melayu.html?id=bgwwQwAACAAJ CTRL+F to search Proverbs in English Definition in English Similar Malay Proverbs Definition in Malay 1 Where there is a country, there are people. A country must have people. Ada air adalah ikan. Ada negeri adalah rakyatnya. 2 Dry bread at home is better than roast meat home's the best hujan emas di negeri orang,hujan batu di negeri sendiri Betapa baik pun tempat orang, baik lagi tempat sendiri. 3 There's no accounting for tastes We can't assume that every people have a same feel Kepala sama hitam hati lain-lain. Dalam kehidupan ini, setiap insan berbeza cara, kesukaan, perangai, tabia...

Pemasangan Joomla! 1.7 pada pelayan web komputer anda

Latihan ini akan memasang sistem pengurusan kandungan laman web ke dalam pelayan web yang anda telah pasang sebelum ini . LANGKAH 1: Aktifkan Pelayan Web dan Pangkalan Data Aktifkan XAMPP Control Panel, melalui “ Start->All Programs->ApacheFriends->XAMPP Control Panel ”. Rajah 2.1 Pastikan pelayan web Apache dan pelayan pangkalan data MySQL diaktifkan dengan klik butang START. -> Rajah 2.2

searchdelete.php (list records of table to delete)

< form name = 'search' method = 'get' action = '' > Insert the firstname < input type = 'text' name = 'txtname' > < input type = 'submit' value = 'search name' > </ form > < ?php //database connect $db = mysqli_connect ( "localhost" , "root" , "" , "mycompanyhr" ); //checking database connection if ( $db == false ) { echo "Connect failed: " . mysqli_connect_error ( $db ); exit (); } else { echo "Connection successful" ; } $n = $_GET [ 'txtname' ]; $sql = "select EMPNO, FIRSTNAME, LASTNAME, WORKDEPT, PHONENO from employee where FIRSTNAME like '%$n%' " ; $rs = mysqli_query ( $db , $sql ); if ( $rs == false ){ echo ( "Query cannot be executed!<br>" ); echo ( "SQL Error : " . mysqli_error ( $db )); } else { echo "<table border=1>...

ViewFlipper Example–a simple FlashCard

UPDATE: Improved with Fling gesture (Sept 2012) UPDATE: ViewFlipper with Flip-In and Flip-Out Animation (August 2012) This tutorial is to demonstrate the ViewFlipper layout that is almost similar to CardLayout (in Java). The app will produce a simple Flash card that provide several screens with different picture for each card. Flip-in and Flip-out animation provided. Added in Sept 2012 – an improvement to support Fling gesture – enjoy… The amendment is only on the coding part. Some how the layout design (main.xml) is quite long. Later I’ll produce separated screen by including several XML layout from outside files. Screenshots;

Installing Google AdMob into Android Apps

Previously I wrote on why ads are needed to help maintaining an app. Read the article here http://blog.kerul.net/2011/05/generating-revenue-from-free-mobile.html . ---This is quite an old article. You may find the latest supporting AdMob 6.x in here http://blog.kerul.net/2012/08/example-how-to-install-google-admob-6x.html --- This is quite a long tutorial, there are 3 major steps involved. The experiment is done using Windows 7, Eclipse Helios and AdMob SDK 4.1.0 (which currently is the latest-during time of writing). STEP 1: Get the ads from AdMob.com To display the AdMob ads in your Android mobile apps, you need to register first at the admob.com . After completing the registration, login and Add Site/App. Refer to Figure 1. Figure 1 Choose the desired platform and fill in the details (as in Figure 2). Just put http:// in the Android Package URL if your app is not published in the market yet. And click Continue. Figure 2 Download the AdMob Android SDK, and save the zip fil...