Java - User-Defined Methods|| PART 1||

The method written by the user or programmer is known as a user-defined method. These methods are modified according to the requirement. User-defined method can be categorized into following four types:
1. Method with passing argument and return value
2. Method with passing argument and no return value.
3. Method with no passing argument and return value.
4. Method with no passing argument and no return value.

# Method with passing argument and return value.
Here we can pass arguments from calling function to called function and called function return final result to calling function as below.
package aboutmethod;

import java.util.Scanner;
//Method with passing argument and return value
class SumNumbers
{
public int sum(int x, int y) {
int s=x+y;
return s;
}
}
public class AddDemo {

public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
System.out.println("Enter any two numbers");
int a=sc.nextInt();
int b=sc.nextInt();
SumNumbers s=new SumNumbers();
int sm=s.sum(a,b);
System.out.println("Total sum="+sm);
}
}
output
Enter any two numbers
77 89
Total Sum=166

# Method with passing argument and no return value
Here we can pass arguments from calling function to called function and called function cannot return final result to calling function so we use void return type to called methods as below.

Program

package aboutmethod;

import java.util.Scanner;

//Method with passing argument and no return value

class SumNumberss
{
public void Sum(int x, int y) {
int s=x+y;
System.out.println("Total sum="+s);
}
}
public class AddDemo {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
System.out.println("Enter any two numbers:");
int a=sc.nextInt();
int b=sc.nextInt();
SumNumberss s=new SumNumberss();
s.Sum(a, b);
}
}