BT-ICD

/**
 * Initialize cartesian pair of point and determine point lies in which quadrant.
 * */
public class QuadrantDemo {
    public static void main(String[] args) {
        int x,y;
        x=1;
        y=-2;
        if(x>0 && y>0)
            System.out.println("Point ( " + x + ", " + y + ")" + " lies in the first quadrant" );

BT-ICD

/**
 * Three ways to establish initialize data member
 * 1.	Field initializer
 *          a.	Specify field’s initial value as part of the field’s declaration
 *          b.	Example: long result = 24;
 * 2.	Constructor
 * 3.	Initialization blocks
 *          a.	Share code across all constructors
 *          b.	Initialization block cannot receive any parameters
 *          c.	A class can have zero or more initialization block

BT-ICD

/**
 * Exercise for loop: To display/print A to Z
 * */
public class PrintAToZCharacters {
    public static void main(String[] args) {
        char ch;
        for (int i = 65; i <=90 ; i++) {
            ch = (char)i;
            System.out.println(ch);
        }

BT-ICD

/**
 * To understand use of break and continue in for loop
 * */
public class ForLoopBreakAndContinueDemo {
    public static void main(String[] args) {
        int i;
        //Example of break - will print 1 to 5 moves outside loop when value of i>5
        for ( i = 1; i <=10 ; i++) {
            System.out.print("Loop-1 --> ");
            if(i>5)

BT-ICD

/**
 * To print 1 to 5 using while loop
 * Example of while loop
 * */
public class WhileLoopDemo1 {
    public static void main(String[] args) {
        int i=1;
        while(i<=5){
            System.out.println(i);
            i++;

BT-ICD

/**
 * While loop demo
 * Allow user to input values as long as user input positive values.
 * Stop getting values from the user once user input negative value.
 * Display number of positive values as well as sum of positive values input by the user.
 * */
import java.util.Scanner;

public class WhileLoopDemo2 {
    public static void main(String[] args) {

BT-ICD

import java.util.Scanner;

/**
 * Program to convert temperature in celsius to temperature in fahrenheit
 * 0 degrees Celsius is equal to 32 degrees Fahrenheit:
 * F = C × 9/5 + 32
 * Sample Data
 * Celsius =0 Fahrenheit = 32
 * Celsius =11 Fahrenheit = 51.8
 * */

BT-ICD

/**
 * Example of Do While Loop
 * Print 1 to 5
 * */
public class DoWhileLoopDemo1 {
    public static void main(String[] args) {
        int i=1;
        do{
            System.out.println("I is " + i);
            i++;

BT-ICD

/**
 * Example of nested loop
 * */
public class PatternDemo1 {
    public static void main(String[] args) {
        int i,j;
        for ( i = 1; i <= 4; i++) {
            for(j=1;j<=4;j++){
//                System.out.print(j);
                System.out.format("%3d",j);

BT-ICD

/**
 * Example to learn methods of String class
 * Reference: https://docs.oracle.com/javase/7/docs/api/java/lang/String.html
 * */
public class StringClassDemo {
    public static void main(String[] args) {
        String data = "We will do it";

        //Convert to upper case and lover case
        String s1 = data.toUpperCase();