PEBO

Someone has just finished creating a class and wants you to review it:

class DataServer extends Server{

public String serverName;

public DataServer () {

serverName = "Customer Service"; super(serverName);

}

}

What do you tell the programmer:

• The code will not compile because there is something wrong in the DataServer method

• The code will compile but the error will occurred when the class is instantiated

• The code will compile and run fin

The following source file is given the name FirstClass.java

import java.*;

public class FirstClass { }

class SecondClass { }

public class ThirdClass { }

What error will the compiler will likely generate?

• public class FirstClass could not be public

• public class SecondClass must be defined in other file named "SecondClass.java" because there cannot be more than one class with a public modifier in the same file

• class SecondClass must be public

• package java not found in import

Which of the following variable definitions are legitimate if it is an instance variable (not class variable)? (choose all that apply)

• Public static int a;

• private static final int a;

• protected int a;

• public int a = 1;

Examine this code:

public class A {

public static void main(String[] args) {

Calculation c = new Calculation();

c.print1();

}

}

class Calculation {

private int number;

public void setNumber(int number) {

this.number = number;

}

public void print1() {

int sum = 0;

for (int i=0; i<this.number;i++){

if (i%2==0)

sum+=i;

}

System.out.println("Sum is"+sum);

}

}

what will be the output when the code is compiled and run?

• The code will not compille

• 10

• 0

• null

• 20

An object is an instantiation of a class. Pernyataan ini dapat diterjemahkan sebagai -sebuah obyek adalah sebuah perwujudan dari sebuah kelas.

• true

• false

Examine this code:

public class A {

public static void main(String[] args) {

Calculation c = new Calculation();

c.setNumber(10);

c.print1();

}

}

class Calculation {

private int number;

public void setNumber(int number) {

this.number = number;

}

public void print1() {

int sum = 0;

for (int i=0; i<this.number;i++){

if (i%2==0)

break;

}

System.out.println("Sum is"+sum);

}

}

What will be the output when the code is compiled and run?

• The code will not compile

• 0

• 20

• null

• 10

If you try to compile and run this class, what will happen?

public class LocalTest {

public static void main(String[] args) {

int i;

i = 20;

System.out.print("int i = " + (++i));

}

}

• it will not compile and give the compile error

• it will compile and output 21 to the screen

• it will compile, but will produce interpreter error when executed

• it will compile and output 20 to the screen

We are given an array named arr as follow:

public class TestClass {

int[][] arr = { { 1, 2, 3 }, { 4, 5 } };

static public void main(String[] args) {

TestClass test = new TestClass();

// print the value of 5 from that array

}

}

What code should be put to print the value of 5 from the array named arr?

• System.out.println(test.arr[1][1]);

• System.out.println(test.arr[1][0]);

• System.out.println(test.arr[0][1]);

A Class can be viewed as a template or definition or blueprint of a group of objects. For example: a banana class. Its objects could be:

-the banana being eaten by Hawari

-the banana desired by Alicia

• true

• false

We are given a two-dimensional array named arr as follow: public class TestClass { int[][] arr = { { 1, 2, 3 }, { 4, 5 } }; static public void main(String[] args) { TestClass test = new TestClass(); // print the length of the second element of the first dimension of the array arr } } What code should be put to print the length of the second element of the first dimension of the array named arr, which is { 4, 5 }?

• System.out.println(test.arr[0].length);

• System.out.println(test.arr.length);

• System.out.println(test.arr[1].length());

• System.out.println(test.arr[1].length);