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Commit 0269e04

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10 files changed

+348
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10 files changed

+348
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lines changed

‎ClassAndObjects/Actor.java‎

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package ClassAndObjects;
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public class Actor {
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// name is a Member Variable
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private String name;
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public String getName() {
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return name;
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}
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public void setName(String name) {
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// This is called shadowing
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// Local variable or parameter with
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// same name as a member variable
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// this.name refers to member variable
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// name refers to local variable
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this.name = name;
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}
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public static void main(String[] args) {
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// bradPitt & tomCruise are objects or instances
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// of Class Actor
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// Each instance has separate value for the
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// member variable name
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Actor bradPitt = new Actor();
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bradPitt.setName("Brad Pitt");
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Actor tomCruise = new Actor();
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tomCruise.setName("Tom Cruise");
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}
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}

‎ClassAndObjects/Bank.java‎

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package ClassAndObjects;
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class BankAccount {
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int accountNum = 0;
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float accountBalance = 0;
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public BankAccount() {
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}
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public BankAccount(int accountNumber, float balance) {
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accountNum = accountNumber;
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accountBalance = balance;
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}
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void setAccountNumber(int num) {
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accountNum = num;
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}
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void withdraw(float amount) {
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accountBalance = accountBalance - amount;
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}
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void deposit(float amount) {
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accountBalance = accountBalance + amount;
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}
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void status(){
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System.out.println("Account Number: "+accountNum);
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System.out.println("Account Balance: "+accountBalance);
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}
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}
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public class Bank {
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public static void main(String[] arg) {
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BankAccount account1 = new BankAccount();
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account1.setAccountNumber(456);
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account1.deposit(1000);
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account1.status();
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BankAccount account2 = new BankAccount(142, 2000);
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account2.withdraw(500);
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account2.status();
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}
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}

‎ClassAndObjects/BicycleDemo.java‎

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package ClassAndObjects;
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class Bicycle{
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int speed=0;
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int gear=1;
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void changeGear(int newValue){
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gear=newValue;
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}
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void speedUp(int inc){
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speed=speed+inc;
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}
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void applybreak(int dec){
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speed=speed-dec;
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}
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void printstate(){
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System.out.println("Speed : "+speed+"\t Gear : "+gear);
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}
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}
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public class BicycleDemo {
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public static void main(String[] args){
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Bicycle b1=new Bicycle();
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Bicycle b2=new Bicycle();
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b1.speedUp(50);
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b1.changeGear(3);
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b1.applybreak(20);
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b1.printstate();
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b2.speedUp(60);
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b2.changeGear(2);
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b2.printstate();
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}
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}

‎ClassAndObjects/CricketScorer.java‎

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package ClassAndObjects;
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public class CricketScorer {
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// Instance Variables - constitute the state of an object
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private int score;
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// Behavior - all the methods that are part of the class
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// An object of this type has behavior based on the
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// methods four, six and getScore
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public void four() {
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score = score + 4;
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}
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public void six() {
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score = score + 6;
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}
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public int getScore() {
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return score;
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}
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public static void main(String[] args) {
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CricketScorer scorer = new CricketScorer();
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scorer.six();
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// State of scorer is (score => 6)
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scorer.four();
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// State of scorer is (score => 10)
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System.out.println(scorer.getScore());
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}
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}
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package ClassAndObjects;
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//Every Java class extends Object class
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public class EveryClassExtendsObject {
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public void testMethod() throws CloneNotSupportedException {
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// toString,hashCode,clone methods are
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// inherited from Object class
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System.out.println(this.toString());
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System.out.println(this.hashCode());
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System.out.println(this.clone());
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}
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public static void main(String[] args) throws CloneNotSupportedException {
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EveryClassExtendsObject example1 = new EveryClassExtendsObject();
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EveryClassExtendsObject example2 = new EveryClassExtendsObject();
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if (example1 instanceof Object) {
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System.out.println("I extend Object");// Will be printed
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}
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// equals method is inherited from Object class
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System.out.println(example1.equals(example2));// false
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}
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}

‎ClassAndObjects/Monster.java‎

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package ClassAndObjects;
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class MonsterWorks {
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public final String TOMBSTONE = "Here Lies a Dead monster";
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private int health = 500;
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private int attack = 20;
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private int movement = 2;
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private boolean alive = true;
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public String name = "Big Monster";
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public int getAttack() {
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return attack;
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}
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public int getMovement() {
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return movement;
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}
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public int getHealth() {
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return health;
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}
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public void setHealth(int decreaseHealth) {
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health = health - decreaseHealth;
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if (health < 0 && alive == true) {
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alive = false;
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}
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}
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public void setHealth(double decreaseHealth) {
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int intDecreaseHealth = (int) decreaseHealth;
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health = health - intDecreaseHealth;
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if (health < 0) {
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alive = false;
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}
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}
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}
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//Moster Class
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public class Monster{
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public static void main(String[] args){
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MonsterWorks gorilla = new MonsterWorks();
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gorilla.name = "Jumbo";
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System.out.println(gorilla.name+" got health power: "+gorilla.getHealth());
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System.out.println(gorilla.name + " has an attack value of " + gorilla.getAttack());
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gorilla.setHealth(30);
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System.out.println(gorilla.name+" got attacked, Now Health "+gorilla.getHealth());
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}
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}

‎ClassAndObjects/ObjectPass.java‎

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package ClassAndObjects;
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class PassObjRef {
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int a, b;
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public PassObjRef(int i, int j) {
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a = i;
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b = j;
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}
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// pass an object
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// Java always pass object (call-by-reference)
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// reference of an object stored in stack area.
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void meth(PassObjRef o) {
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o.a *= 2;
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o.b /= 2;
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}
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}
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class ObjectPass{
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public static void main(String args[]) {
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PassObjRef ob = new PassObjRef(15, 20);
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System.out.println("ob.a and ob.b before call: " + ob.a + " " + ob.b);
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ob.meth(ob);
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System.out.println("ob.a and ob.b after call: " + ob.a + " " + ob.b);
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}
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}

‎ClassAndObjects/Radio.java‎

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package ClassAndObjects;
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public class Radio {
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int volume;
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String station;
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boolean powerStatus;
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public void increaseVolume() {
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volume+=2;
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}
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public void decreaseVolume(){
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volume--;
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}
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public void changeStation(String newStation) {
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station = newStation;
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}
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public void turnOn() {
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volume = 3;
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powerStatus = true;
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}
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public void turnOff() {
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volume = 0;
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station="Nil";
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powerStatus = false;
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}
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void status(){
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if(powerStatus)
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System.out.println("Radio is On! ");
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else
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System.out.println("Radio is off! ");
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System.out.println("Station Name: "+station);
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System.out.println("Volume: "+volume);
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}
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public static void main(String[] args) {
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Radio r1=new Radio();
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r1.changeStation("Radio Mirchi! ");
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r1.turnOn();
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r1.status();
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System.out.println("----------------------------------");
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r1.increaseVolume();
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r1.status();
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System.out.println("----------------------------------");
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r1.decreaseVolume();
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r1.turnOff();
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r1.status();
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System.out.println("----------------------------------");
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}
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}

‎ClassAndObjects/Solution.java‎

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package ClassAndObjects;
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//public class Cricketer {
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// String name;
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// int odiRuns;
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// int testRuns;
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// int t20Runs;
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//
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// public int totalRuns() {
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// int totalRuns = odiRuns + testRuns + t20Runs;
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// return totalRuns;
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// }
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//}
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import java.util.Scanner;
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public class Solution {
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public static void main(String[] args) {
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Scanner scan = new Scanner(System.in);
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int i = scan.nextInt();
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double d = scan.nextDouble();
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scan.nextLine();// to consume extra line generated by inputBuffer in nextDouble
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String s = scan.nextLine();
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System.out.println("String: " + s);
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System.out.println("Double: " + d);
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System.out.println("Int: " + i);
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scan.close();
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}
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}

‎ClassAndObjects/TrickyQue.java‎

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package ClassAndObjects;
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public class TrickyQue {
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public static void main(String[] args) {
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Integer i1 = 127;
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Integer i2 = 127;
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System.out.println(i1 == i2);
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Integer i3 = 128;
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Integer i4 = 128;
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System.out.println(i3 == i4);
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}
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}

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