Function Return in Java 20

In Java, a method or function can return a value using the return statement. The return statement is followed by the value that is to be returned. The value should be of the same data type as the return type specified in the method or function signature.

Here is an example of a method that returns an integer value:

public static int square(int num) {
    int result = num * num;
    return result;
}

In the above example, the method square() takes an integer argument num and returns the square of num. The data type of the return value is an integer which is specified in the method signature. Inside the method, the square of num is calculated and stored in a variable result. Finally, the return statement is used to return the value of result.

Here's how you can call the above method:

int x = 5;
int y = square(x);
System.out.println("The square of " + x + " is " + y);

The output of the above code is:

The square of 5 is 25

Another example of a method that returns a value:

public static boolean isEven(int num) {
    boolean result = false;
    if(num % 2 == 0) {
        result = true;
    }
    return result;
}

In the above example, the method isEven() takes an integer argument num and returns a boolean value indicating whether the number is even or not. Inside the method, a variable result is initialized to false. If the remainder of num divided by two is zero, then result is set to true. Finally, the return statement is used to return the value of result.

Here's how you can call the above method:

int x = 6;
if(isEven(x)) {
    System.out.println(x + " is even");
} else {
    System.out.println(x + " is odd");
}

The output of the above code is:

6 is even