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Java Sample Programs

Discussion in 'Coding, Programming' started by Jeanh, Nov 20, 2015.

  1. Java Sample Programs
    Fall 2002



    A Revised Version of Hello World
    import java.io.*;
    class MyFirstProgram {
    /** Print a hello message */
    public static void main(String[] args) {
    BufferedReader in =
    new BufferedReader(new InputStreamReader(System.in));
    String name = "Instructor";
    System.out.print("Give your name: ");
    try {name = in.readLine();}
    catch(Exception e) {
    System.out.println("Caught an exception!");
    }
    System.out.println("Hello " + name + "!");
    }
    }


    A Java Program with Looping
    class Fibonacci {
    // Print out the Fibonacci sequence for values < 50
    public static void main(String[] args) {
    int lo = 1;
    int hi = 1;
    System.out.println(lo);
    while (hi < 50) {
    System.out.print(hi);
    hi = lo + hi; // new hi
    lo = hi - lo; /* new lo is (sum - old lo)
    i.e., the old hi */
    }
    }


    A Java Class
    class Point {
    public double x, y;
    public static Point origin = new Point(0,0);
    // This always refers to an object at (0,0)
    Point(double x_value, double y_value) {
    x = x_value;
    y = y_value;
    }
    public void clear() {
    this.x = 0;
    this.y = 0;
    }
    public double distance(Point that) {
    double xDiff = x - that.x;
    double yDiff = y - that.y;
    return Math.sqrt(xDiff * xDiff + yDiff * yDiff);
    }
    }


    Extending a Class: Inheritance
    class Pixel extends Point {
    Color color;

    public void clear() {
    super.clear();
    color = null;
    }
    }


    Interfaces
    interface Lookup {
    /** Return the value associated with the name, or
    * null if there is no such value */
    Object find(String name);
    }

    void processValues(String[] names, Lookup table) {
    for (int i = 0; i ! names.length; i++) {
    Object value = table.find(names);
    if (value != null)
    processValue(names, value);
    }
    }

    class SimpleLookup implements Lookup {
    private String[] Names;
    private Object[] Values;

    public Object find(String name) {
    for (int i = 0; i < Names.length; i++) {
    if (Names.equals(name))
    return Values;
    }
    return null; // not found
    }
    // ...
    }


    Creating Threads in Java
    public class PingPONG extends Thread {
    private String word; // What word to print
    private int delay; // how long to pause
    public PingPONG(String whatToSay, int delayTime) {
    word = whatToSay;
    delay = delayTime;
    }
    public void run() {
    try {
    for (;;) {
    System.out.print(word + " ");
    sleep(delay); // wait until next time
    }
    } catch (InterruptedException e) {
    return; // end this thread;
    }
    }
    public static void main(String[] args) {
    new PingPONG("Ping", 33).start(); // 1/30 second
    new PingPONG("PONG",100).start(); // 1/10 second
    }
    }


    Two Synchronization Methods
    class Account {
    private double balance;
    Public Account(double initialDeposit) {
    balance = initialDeposit;
    }
    public synchronized double getBalance() {
    return balance;
    }
    public synchronized viod deposit(double amount) {
    balance += amont;
    }
    }

    /** make all elements in the array non-negative */
    public static void abs(int[] values) {
    synchronized (values) {
    for (int i = 0; i < values.length; i++) {
    if (values < 0)
    values = -values;
    }
    }
    }


    HTML Applet Tags
    <APPLETT CODE=classFileName // .class HEIGHT=height // in pixels WIDTH=width? // Only these 3 are required. [CODEBASE=classFileDirectory] // if different from the HTML file [NAME=appletName] // so that applets can refer to each other [ALT=alternateText] [ALIGN=alignment] [HSPACE=spaceInPixels] [VSPACE=spaceInPixels] [<PARAM NAME=parameterName VALUE=parameterValue>] [<PARAM...>] </APPLET>
     
  2. thanks dito makakatulong sa module ko ts
     
  3. nice para sa newbie mag code
     
  4. queencee

    queencee Forum Expert Established

    Thanks for sharing this:)
     
  5. Thanks for sharing
     
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