Click here to watch in Youtube :
https://www.youtube.com/watch?v=9Njpp8-StJM&list=UUhwKlOVR041tngjerWxVccw

ReturnDemo.java

public class ReturnDemo
{
    public static void main(String[] args)
    {

        /*
         * The return statement exits from the current method, and control flow
         * returns to where the method was invoked.
         * 
         * The return statement has two forms: one that returns a value, and one
         * that doesn't.
         * 
         * To return a value, simply put the value (or an expression that
         * calculates the value) after the return keyword.
         */

        ReturnDemo returnDemo = new ReturnDemo();
        int totalValue = returnDemo.getTotal(10, 10);
        System.out.println("totalValue : " + totalValue);

    }

    public int getTotal(int a, int b)
    {
        int c = a + b;
        /*
         * The data type of the returned value must match the type of the
         * method's declared return value.
         */
        return c;
    }

}

Output

totalValue : 20

public class ReturnVoidDemo
{
    public static void main(String[] args)
    {

        /*
         * The return statement exits from the current method, and control flow
         * returns to where the method was invoked.
         * 
         * The return statement has two forms: one that returns a value, and one
         * that doesn't.
         * 
         * To return a value, simply put the value (or an expression that
         * calculates the value) after the return keyword.
         */

        ReturnVoidDemo returnVoidDemo = new ReturnVoidDemo();
        returnVoidDemo.calculateTotal(0, 0);
        System.out.println("End---");

    }

    public void calculateTotal(int a, int b)
    {

        if (a == 0 && b == 0)
        {
            /*
             * When a method is declared void, use the form of return that
             * doesn't return a value.
             */
            System.out
                    .println("Both a and b are '0',So current method will exist");
            return;
        }

        int totalValue = a + b;
        System.out.println("totalValue :" + totalValue);
    }

}