SCJP exercise : operators

Exercise :



Given the following :
public class Test {


public static void main(String [] args) {

int num = 1;
if ( num == 'a') {
System.out.println("Good result !");
} else {
System.out.println("Result:" + num);
}
}

}


What is the result ? (choose one)

A Good result !
B Result:1
C Compilation fails
D An exception is thrown at runtime





Solution :

The result is C.There is no compilation error.You can compare 1 with 'a' because the comparison use the unicode value of a.So it's correct to compare 1 with 'a'.

SCJP exercise : operators

An other exercise ! The goal is practice and learn commons java certification SCJP questions.

Exercise :



Given the following :
public class Test {
public static void main(String [] args) {

int num = 1;
if ( num = 2) {
System.out.println("Result:" + num);
}
System.out.println("Result:" + num);
}
}


What is the result ? (choose one)

A Result:1
B Result:2
C Compilation fails
D An exception is thrown at runtime





Solution :

The solution is C.In fact we set num to 2 with num=2.
So the result of the setting is an int.Or the if is waiting a boolean so the compilation fails.

Good year

Hi !

This year we will see many things like certification exercise, Java tips, Go langage ...
So it's exiting !