Questions and answers for exam Preparation

MCQs

Total Questions : 158 | Page 1 of 16 pages

What is the output of this program?

import java.util.*;
class LOCALE_CLASS {
public static void main(String args[]) {
Locale obj = new Locale("HINDI", "INDIA") ;
System.out.print(obj.getDisplayLanguage());
}
}

India
INDIA
HINDI
Nothing is displayed

Discuss Question

Answer: Option C. -> HINDI

None.
Output:
$ javac LOCALE_CLASS.java
$ java LOCALE_CLASS
HINDI

Question 2.

What is the output of this program?

import java.util.*;
class LOCALE_CLASS {
public static void main(String args[]) {
Locale obj = new Locale("HINDI", "INDIA") ;
System.out.print(obj.getDisplayLanguage());
}
}

India
INDIA
HINDI
Nothing is displayed

Discuss Question

Answer: Option C. -> HINDI

None.
Output:
$ javac LOCALE_CLASS.java
$ java LOCALE_CLASS
HINDI

Question 3.

Which of these constant value will change when the button at the end of

scroll bar was clicked to increase its value?

BLOCK_DECREMENT
BLOCK_INCREMENT
UNIT_DECREMENT
UNIT_INCREMENT

Discuss Question

Answer: Option D. -> UNIT_INCREMENT

UNIT_INCREMENT VALUE will change when the button at the end of scroll bar

Question 4.

Which of these is superclass of ContainerEvent class?

WindowEvent
ComponentEvent
ItemEvent
InputEvent

Discuss Question

Answer: Option B. -> ComponentEvent

ContainerEvent is superclass of ContainerEvent, FocusEvent, KeyEvent,

MouseEvent and WindowEvent.

Question 5.

What is the output of this program?

class string_class {
public static void main(String args[])
{
String obj = "hello";
String obj1 = "world";
String obj2 = "hello";
System.out.println(obj.equals(obj1) + " " + obj.equals(obj2));
}
}

false false
true true
true false
false true

Discuss Question

Answer: Option D. -> false true

equals() is method of class String, it is used to check equality of two String objects, if they

are equal, true is retuned else false.
output:
$ javac string_class.java
$ java string_class
false true

Question 6.

Which of these is superclass of WindowEvent class?

WindowEvent
ComponentEvent
ItemEvent
InputEvent

Discuss Question

Answer: Option B. -> ComponentEvent

ContainerEvent is superclass of ContainerEvent, FocusEvent, KeyEvent, MouseEvent

and WindowEvent.

Question 7.

What is the output of this program?

class newthread implements Runnable {
Thread t;
newthread() {
t = new Thread(this,"My Thread");
t.start();
}
public void run() {
System.out.println(t);
}
}
class multithreaded_programing {
public static void main(String args[]) {
new newthread();
}
}

My Thread
Thread[My Thread,5,main]
Compilation Error
Runtime Error

Discuss Question

Answer: Option B. -> Thread[My Thread,5,main]

None.
Output:
$ javac multithreaded_programing.java
$ java multithreaded_programing
Thread[My Thread,5,main]

Question 8.

What is the output of this program?

class A {
int i;
int j;
A() {
i = 1;
j = 2;
}
}
class Output {
public static void main(String args[])
{
A obj1 = new A();
System.out.print(obj1.toString());
}
}