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rahulXbarnwalrahulXbarnwal
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Initial commit - Java tutorials
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‎.gitignore‎

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### IntelliJ IDEA ###
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out/
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!**/src/main/**/out/
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!**/src/test/**/out/
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.kotlin
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### Eclipse ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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bin/
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!**/src/main/**/bin/
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!**/src/test/**/bin/
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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### VS Code ###
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.vscode/
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### Mac OS ###
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.DS_Store

‎.idea/.gitignore‎

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‎.idea/misc.xml‎

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‎.idea/modules.xml‎

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‎.idea/vcs.xml‎

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‎Prime Program.iml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<module type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="true">
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<exclude-output />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>

‎src/Hello.java‎

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// In a file, there can be multiple classes but there will be just one public class
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public class Hello { // this is a block
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public static void main (String[] args) {
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System.out.println("Hello World!");
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System.out.println(4 + 3);
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System.out.println();
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}
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}

‎src/Variables.java‎

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public class Variables {
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public static void main(String[] args) {
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boolean isPassed = true;
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long count = 12;
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int countInt = (int)count;
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byte marks = 13;
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short studentsCount = 1235;
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float pi = 3.14f;
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double secondPi = 3.143213241123; // will print all precision
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float x = 3.143213241123f; // will print till 7 decimal points
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System.out.println(pi);
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System.out.println(secondPi);
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System.out.println(x);
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char myLetter = 'a';
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System.out.println(myLetter);
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int age = 128;
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byte newAge = (byte)age; // explicit typecasting, lossy conversion
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System.out.println(newAge); // -128 -> rotation
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}
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}

‎src/animals/Animal.java‎

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package animals;
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public class Animal {
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// protected constructor
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protected Animal() {
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System.out.println("Animal constructor");
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}
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// protected method
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protected void eat () {
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System.out.println("Animal is eating");
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}
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}

‎src/arrays/BasicsOfArray.java‎

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package arrays;
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public class BasicsOfArray {
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public static void main(String[] args) {
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// int age[]; // declaration
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// age = new int[5]; // allocation
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// int age[] = new int[5];
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//
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// age[0] = 5;
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// age[1] = 2;
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//
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// System.out.println(age[0]);
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// System.out.println(age[1]);
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// System.out.println(age[2]);
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//
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// System.out.println(age.length);
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// int marks[] = {98, 12, 45, 12, 65};
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//
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// System.out.println(marks[0]);
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String names[] = {"Rahul", "Prateek", "Mayank", "Ravi"};
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for(int i = 0; i < names.length; i++) {
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System.out.println("Name is " + names[i]);
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}
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for (String name: names) {
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System.out.println("for each " + name);
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}
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}
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}

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