Basic Concept of function

 yaha hamne void ki jgh int rkha hai 

Void ka mtlb hota hai return nothing

Java (aur anya programming languages mein), "return" ek keyword hota hai, jo ek function ya method ke execution ke baad ek value ko wapas karne ke liye istemal hota hai. Iska mtlb hota hai ki jab aap ek function mein "return" statement ka istemal karte hain, toh aap us function se kisi specific value ko wapas kar sakte hain.

Yah value ho sakta hai koi primitive data type (jaise int, float, boolean) ho ya phir ek object ho. Jab aap ek function mein "return" statement ka istemal karte hain, toh function ka execution us point tak pahunchta hai aur control wapas us jagah par aata hai jahan se function ko call kiya gaya tha, aur yah value wapas karke aata hai.

agr hame return me integer value chahiye to void ki jgh int ka use krte hai 

main ki jgh ham ek name dalte hai jaise sum

package HelloWorld;

import java.util.Scanner; //this is a Scanner class

public class LearningJava {

public static int sum(int num1, int num2) {

return num1 + num2;

}

public static void main (String[] args) {

Scanner scan = new Scanner(System.in); //this is my scanner

int num1 = 10;

int num2 = 12;

int result = sum(num1,num2);

System.out.println();

}

}