What is the output of the following code? Java public synchronized void print() { System.out.println("Start"); try { Thread.sleep(100); } catch (Exception e) {} System.out.println("End"); }

Will always print "Start" and "End" together

Might throw InterruptedException

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Java Synchronization Basics

Here are 10 essential multiple-choice questions on Java Synchronization Basics, covering key concepts.

Last Updated : Apr 25, 2025

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Question 1

Why is synchronization used in Java multithreading?

A
To improve CPU performance
B
To allow multiple threads to execute at once
C
To prevent data inconsistency and race conditions
D
To increase thread priority

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Question 2

Which keyword is used to synchronize a method in Java?

A
lock
B
sync
C
synchronized
D
atomic

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Question 3

What is the output of the following code?

Java

public synchronized void print() {
    System.out.println("Start");
    try { Thread.sleep(100); } catch (Exception e) {}
    System.out.println("End");
}

A
Will always print "Start" and "End" together
B
Will print "Start" only
C
Might throw InterruptedException
D
Prints "End" before "Start"

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Question 4

Which of the following can be synchronized in Java?

A
Methods only
B
Constructors
C
Blocks and Methods
D
Interfaces

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Question 5

Which object does a synchronized instance method lock on?

A
Class object
B
The method itself
C
The this object
D
The parent class

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Question 6

How do you synchronize a block of code inside a method?

A
lock(this)
B
synchronize(this)
C
synchronized(this) { /* code */ }
D
Thread.lock(this) {}

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Question 7

Which type of lock is acquired when using a static synchronized method?

A
Instance lock
B
Local lock
C
Class-level lock
D
Method-level lock

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Question 8

What is a potential problem with improper synchronization?

A
Compilation error
B
Memory leak
C
Faster execution
D
Deadlock

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Question 9

Which interface or class in Java provides explicit locking besides synchronized?

A
LockSupport
B
ReentrantLock
C
AtomicBoolean
D
ThreadGroup

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Question 10

What happens if two threads access a non-synchronized method of the same object?

A
One thread waits
B
Both can execute concurrently
C
Compilation error
D
JVM throws exception

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