Program to multiply two number in Java

class mul_num
{
public int mul (int a, int b)
{
return (a*b);
}
}
class mulnum
{
public static void main (String args[])
{
int a,b;
a=10;
b=23;
mul_num mulobj=new mul_num();
System.out.println("multiplication="+mulobj.mul(a,b));
}
}


OUTPUT ;

Program to find area of rectangle using concept of Interface

interface Area
       {
   final static float pi = 3.14F;
   float compute (float x, float y);
       }
class Rectangle implements Area 
      {
        public float compute (float x, float y)
         {
            return (x*y);
         }}
class InterfaceTest
{
    public static void main (String args[])
  {
    Rectangle rect = new Rectangle();
   Area area;
  area = rect;
System.out.println ("Area of rectangle ="+area.compute(10,20));
}
}

OUTPUT:: 

Program to make Thread in Java using concept of multi threading

class A extends Thread
{
 public void run ()
 {
   System.out.println("threadA started");
   for (int i =1; i<=4; i++)
     {
       System.out.println("\tFrom Thread A: i="+i);
     }
     System.out.println("Exit from A");
 }
}
class B extends Thread
{
 public void run ()
 {
   System.out.println("threadB started");
   for (int j =1; j<=4; j++)
     {
       System.out.println("\tFrom Thread B: j="+j);
     }
     System.out.println("Exit from B");
 }
}
class C extends Thread
{
 public void run ()
 {
   System.out.println("threadC started");
   for (int k =1; k<=4; k++)
     {
       System.out.println("\tFrom Thread C: k="+k);
     }
     System.out.println("Exit from C");
 }
}
class ThreadPriority
{
  public static void main (String args[])
  {
    A threadA = new A();
    B threadB = new B();
    C threadC = new C();
threadC.setPriority(Thread.MAX_PRIORITY);
threadB.setPriority(threadA.getPriority()+1);
threadA.setPriority(Thread.MIN_PRIORITY);

System.out.println("started thread A");
threadA.start();

System.out.println("started thread B");
threadB.start();

System.out.println("started thread C");
threadC.start();

System.out.println("End of main thread");
}
}

Program to find Volume of given box in java

class volume
{
public static void main (String args [])
{
int l=5,b=6,h=10;
int volume;
volume=l*b*h;
System.out.println (" volume of box="+volume);
}
}


Output::

Program to print grade of student as given marks in 5 subject

import java.util.*;
class students
{
public static void main (String args [])
{
int m1,m2,m3,m4,m5,tm;
double per;
Scanner sc= new Scanner (System.in);
System.out.println ("Enter the marks of 5 subject");
m1= sc.nextInt ();
m2= sc.nextInt ();
m3= sc.nextInt ();
m4= sc.nextInt ();
m5= sc.nextInt ();
tm= m1+m2+m3+m4+m5;
per=(tm/500.0)*100;
 if (per>=80)
  {
      System.out.println (per+"A");
  }
    else if (per>=70 && per<80)
  {
   System.out.println (per+"B");
  }
   else if (per>=60 && per<70)
   {
   System.out.println (per+"C");
   }
   else if (per>=60 && per<50)
    {
      System.out.println (per+"D");
    }
   else
   {
   System.out.println (per+"Fail");
   }
   }
   }

Program to subtract two number in Java

Here we learn how to write a program in java to subtract two numbers. We made two class here but you have to save your file name with the second class name because compiler starts execution on that class where main () is placed.

the program will be executed the same as the earlier addition program https://www.programmingponds.com/2019/02/program-to-add-two-number-in-java.html

class sub_num
{
public int sub (int a, int b)
{
return (a-b);
}
}
class subnum
{
public static void main (String args[])
{
int a,b;
a=40;
b=10;
sub_num subobj=new sub_num();
System.out.println("subtraction="+subobj.add(a,b));
}
}

Program to add two number in Java

Here we learn how to write a program in java to add two numbers. We made two class here but you have to save your file name with the second class name because compiler starts execution on that class where main () is placed.

class add_num
{
public int add (int a, int b)
{
return (a+b);
}
}
class Addnum
{
public static void main (String args[])
{
int a,b;
a=10;
b=23;
add_num addobj=new add_num();
System.out.println("Addition="+addobj.add(a,b));
}
}

Output::