What is the result of the following code execution?

public class BooleanTest {
   static boolean test1(int val) {
        System.out.println("test1("+ val +")");
        System.out.println("result: " + (val < 10));
        return val < 10;
    }

    static boolean test2(int val) {
        System.out.println("test2("+ val +")");
        System.out.println("result: " + (val < 20));
        return val < 20;
    }

    static boolean test3(int val) {
        System.out.println("test3("+ val +")");
        System.out.println("result: " + (val < 30));
        return val < 30;
    }

    public static void main(String[] args) {
       if(test1(0) && test2(20) && test3(20))
           System.out.println("Expression is true");
       else
           System.out.println("Expression is false");
    }
}
Explanation
&& operator evaluates the operands in order from left to right until it can unequivocally determine the truth of the whole expression.
Therefore, in this example, only two methods are called:
test1(0) – true
test2(20) – false
There is no sense to call test3() method, because regardless of its result, it is clear that the value of the entire expression is false.

Follow CodeGalaxy

Mobile Beta

Get it on Google Play
Send Feedback
Cosmo
Sign Up Now
or Subscribe for future quizzes