Sample Java Codes - Part 1

Code 1: Hello World

class hello{
public static void main (String args[]){
System.out.println("Hello World");
}
}

Code 2: Mathematical Operations on 2 Numbers entered by User

// This program takes input from user and gives answer in terms of Addition, Modulus, Multiplication & Divison of those numbers

import java.util.Scanner;
public class mathOperators {
public static void main (String args[]){
Scanner var1 = new Scanner(System.in);
int num1,num2,ans;
System.out.println("Eneter number of num1");
num1 = var1.nextInt();
System.out.println("Eneter number of num2");
num2 = var1.nextInt();
ans=num1+num2;
System.out.println("Addition = " +ans);
ans = num1 % num2;
System.out.println("Modulus Ans = " +ans);
ans = num1 * num2;
System.out.println("Multiplication Ans = " +ans);
ans = num1 /num2;
System.out.println("Division Ans = " +ans);
}
}

Code 3: Mathematical Operators (x++, ++x, x+=5)

import java.util.Scanner;
public class incrementOperators {
public static void main (String args []){
Scanner var1 = new Scanner(System.in);
System.out.println("Enter Any Number");
// Assigning number entered by user to x
int x = var1.nextInt();
// Display value of x after doing x++
System.out.println(x++);
//Display value of x after step above
System.out.println(x);
// Display value of x after ++x
System.out.println(++x);
// Display value of x after adding 5
x = x+5;
System.out.println(x);
//Equivalent to x = x+5
x+=5;
System.out.println(x);

}
}

Code 4: If Statement - Checking if a number entered by user is Even or Odd

import java.util.Scanner;
public class ifStatement {
public static void main (String args[]){
Scanner var1 = new Scanner(System.in);
int num1;
System.out.println("Enter the  number");
num1 = var1.nextInt();
if (num1 % 2 == 0){
System.out.println("You entered a Even Number");
}else{
System.out.println("You entered a Odd number");
}
}
}