What will be outputted by the following code? System.out.println(5 + \"5\" + 5);

Question

What will be outputted by the following code?

System.out.println(5 + "5" + 5);

510

555

60

105

15

4 points   

QUESTION 17

A class must implement all abstract methods inherited from a parent class or from an interface, or else it must be declared abstract itself.

True

False

2 points   

QUESTION 18

Which of the following is the correct way to declare the main method in Java?

public static void main()

int main(int argc, char **argv)

private static void main(String[] args)

public static void main(String[] args)

4 points   

QUESTION 19

Which keyword is used in Java to mark an instance field (also known as a member or an attribute) as a constant?

abstract

const

static

final

4 points   

QUESTION 20

What will be outputted by the following code?

System.out.println(72 + 72 + "72");

14472

216

The compilation of this code will fail.

727272

72

4 points   

QUESTION 21

Place the following data types in order from smallest range to largest range of values.

      -       1.       2.       3.       4.      

long

      -       1.       2.       3.       4.      

byte

      -       1.       2.       3.       4.      

int

      -       1.       2.       3.       4.      

short

4 points   

QUESTION 22

What changes will make this code compile?

class X {
    X() { }
    private void one() { }
}

public class Y extends X {
    Y() { }
    private void two() { one(); }
    public static void main(String[] args) {
       new Y().two();
    }
}

Adding the protected modifier to the X() constructor

Removing the private modifier from the two() method

Removing the Y() constructor

Adding the public modifier to the declaration of class X

Changing the private modifier on the declaration of the one() method to protected

4 points   

QUESTION 23

Which of the following programs contains no errors?  (Study your choices carefully!)

package edu.jsu.mcis.cs232;
import java.util.String;
public class Hello {
    public static void main(String[] args) {
       System.out.println("Hello, world!");
    }
}

package edu.jsu.mcis.cs232;
include java.lang.String;
public class Hello {
    public static void main(String[] args) {
       System.out.println("Hello, world!");
    }
}

package edu.jsu.mcis.cs232;  
public class Hello {
    public static void main(String[] args) {
       System.out.println("Hello, world!");
    }
}

import java.lang.String;
package edu.jsu.mcis.cs232;  
public class Hello {
    public static void main(String args[]) {
       String str =  "Hello, world!";
       System.out.println(str);
    }
}

4 points   

QUESTION 24

By declaring a variable to be of type auto, Java will automatically deduce the type of the variable from the type of the value with which it is initialized.

True

False

2 points   

510

555

60

105

15

Explanation / Answer

16) 555 17) True 18) public static void main(String[] args) 19) final 20) 14472 21) byte - short - int - long 22) Changing the private modifier on the declaration of the one() method to protected 23) package edu.jsu.mcis.cs232; include java.lang.String; public class Hello { public static void main(String[] args) { System.out.println("Hello, world!"); } } 24) False

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