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In this post, we discuss some basic programs of Java.

We used the Eclipse IDE to develop and run these programs. 

1)Addition of two numbers

class addi { 
  public static void main(String ap[]) { 
   int a=10; 
   int b=20; 
   int c=a+b; 
   System.out.println("add is "+c);; 
   } 
 }

2)Addition of any two numbers

import java.util.Scanner;

public class addition {

public static void main(String[] args) {
int a,b,c;
Scanner s = new Scanner(System.in);
System.out.println("enter any two numbers:-");
a=s.nextInt();
b=s.nextInt();
c=a+b;
System.out.println("sum:"+c);
 }
}

3)How to print a<b and a>b

package com.pkg;


import java.util.Scanner;


public class Addition {


public static void main(String[] args) {
// TODO Auto-generated method stub


int a,b,c;


Scanner s=new Scanner(System.in);
System.out.println("Enter 1st no.");
a=s.nextInt();
System.out.println("Enter 2nd no.");
b=s.nextInt();


if(a<b)
{
System.out.println("2nd no. is greater i.e." +b);
}
else if(a>b)
{
System.out.println("1st no. is greater i.e."+a);
}
else
{
System.out.println("Same");
}
}
}

4)Addition, Subtraction, Multiplication, and Division of specified two number

class Calculation {
int z;
public void addition(int x,int y)
{
z = x + y;
System.out.println("the sum of given no is:"+z);
}
public void substraction(int x,int y)
{
  z= x - y;
  System.out.println("the sub of given no is:"+z);
}
}
public class MyCal extends Calculation{
public void multiplication(int x,int y)
{
z = x * y;
System.out.println("the mul of given no is:"+z);
}
public void division(int x,int y)
{
z = x / y;
System.out.println("the div of given no is:"+z);
}

public static void main(String[] args) {
int a=20,b=10;
MyCal demo = new MyCal();
demo.addition(a, b);
demo.substraction(a, b);
demo.multiplication(a, b);
demo.division(a, b);
}
}

5)Reverse string

import java.util.*;

class rev
{
               public static void main(String ap[])
               {
                String str[];
                Scanner sc=new Scanner(System.in);
                System.out.println("Enter the string");
                str=sc.nextLine();
                strrev(Str);
                System.out.println("reverse string is"+str);
               }
}

Note: You can use these codes free. Just copy and paste it into your IDE.