OOP in JAVA MCQ BCA Third Semester 2023

What is process when two or more threads need to access share resource, they need some way to ensure that resource will used by only one thread at a time?

1

Deadlock

2

Synchronization

3

Interthread communication

4

Starvation

Which of the following is unchecked exception in java?

1

IOException

2

SQLException

3

NullPointerException

4

FileNotFoundException

Which of the following class is used to read data from file in character Stream?

1

FileInputStream

2

FileOutputStream

3

FileReader

4

FileWriter

Which of the following is not valid declaration of for loop?

1

for(int a=7;a<=77;a+=7)

2

for(int a=99;a>=0;a/9)

3

for(int a=2;a<=20;a=2*a)

4

for(int a-20;a-2; –a)

Which of the following is not primitive data type defined in Java?

1

Byte

2

long

3

Boolean

4

String

What is process by which one object acquires all the properties and behaviors of another object?

1

Inheritance

2

Polymorphism

3

Abstraction

4

Encapsulation

Which of the following is not method of Iterator?

1

hasNext()

2

next()

3

remove()

4

empty()

Which of the following keyword is used to derive child interface from parent interface?

1

Package

2

import

3

extends

4

implements

What is process when two or more threads need to access share resource, they need some way to ensure that resource will used by only one thread at a time?

1

Deadlock

2

Synchronization

3

Interthread communication

4

Starvation

What is name of swing control that is normally display one entry and act as dropdown list?

1

JList

2

JComboBox

3

JRadioButton

4

JCheckBox