• Placement Questions
• /
• Java

Frequently Asked Java interview questions and answers for freshers Page 3

(#M40167124) JAVA QUESTION Is array column size mandatory? Keep an EYE

Column size is mandatory to create an array in java. State true or false

Asked In Java Jax (3 years ago)

Unsolved

Is this Puzzle helpful?   (4)   (2) Submit Your Solution

(#M40018952) JAVA QUESTION Advanced JAVA questions Keep an EYE

Which constructs an anonymous inner class instance?
A. Runnable r = new Runnable() { };
B. Runnable r = new Runnable(public void run() { });
C. Runnable r = new Runnable { public void run(){}};
D. System.out.println(new Runnable() {public void run() { }});

Asked In Java (12 years ago)

Unsolved Read Solution (5)

Is this Puzzle helpful?   (13)   (0) Submit Your Solution Miscellaneous

(#M40167132) JAVA QUESTION Exceptions 2 Keep an EYE

class ProductNotFoundException extends Exception {

//Some code

}

class Shop {

public void findProduct(int productId) throws ProductNotFoundException {

//some code

throw new ProductNotFoundException();

//some code

}

}

class ABCShop{

public void findProductsList(){

new Shop().findProduct(101);

}

}

Which of the following statement(s) are true for the above code?

A. This code will compile if we add throws ProductNotFoundException in the signature of method findProductsList().
B. This code will compile but returns no output
C. This code will compile if we add a try-catch block in findProductsList().
D. This code will compile if in method findProductsList () returns a list instead of void

Asked In Java Jax (3 years ago)

Unsolved Read Solution (1)

Is this Puzzle helpful?   (8)   (11) Submit Your Solution

(#M40167118) JAVA QUESTION Number of string objects Keep an EYE

public String makingStrings()
{
String str = "Welcome";

str = str.substring(1, 5);

str = str.toUpperCase();

return str;
}

How many String objects are created in the heap when this method is invoked?

A. 4
B. 2
C. 3
D. 1

Asked In Java Jax (3 years ago)

Unsolved Read Solution (1)

Is this Puzzle helpful?   (3)   (1) Submit Your Solution Basics

(#M40031852) JAVA QUESTION Keep an EYE

Which of the following are legal lines of Java code?
1. int w = (int)888.8;
2. byte x = (byte)100L;
3. long y = (byte)100;
4. byte z = (byte)100L;
a) 1 and 2
b) 2 and 3
c) 3 and 4
d) All statements are correct.

Asked In Java Rajendra Singh (11 years ago)

Unsolved Read Solution (16)

Is this Puzzle helpful?   (132)   (51) Submit Your Solution Program

(#M40167121) JAVA QUESTION StringBuilder vs StringBuffer Keep an EYE

StringBuilder is less efficient and slower than StringBuffer. State true or false.

Asked In Java Jax (3 years ago)

Unsolved Read Solution (1)

Is this Puzzle helpful?   (0)   (1) Submit Your Solution

(#M40167122) JAVA QUESTION Output Keep an EYE

What is the output of the following program?

import java.util.regex.*;

class Test
{
public static void main(String args[])
{
Pattern p = Pattern.compile(".ech");
Matcher m = p.matcher("tech");
boolean b = m.matches();
System.out.println(b);
}
}

A. true
B. false
C. Compilation Error
D. Runtime Error

Asked In Java Jax (3 years ago)

Unsolved Read Solution (1)

Is this Puzzle helpful?   (0)   (1) Submit Your Solution

(#M40167123) JAVA QUESTION StringBuilder vs StringBuffer Keep an EYE

class MyLogger
{
private StringBuilder logger = new StringBuilder();
public void log(String message, String user)
{
logger.append(message);
logger.append(user);
}
}

The programmer must guarantee that a single MyLogger object works properly for a multi threaded system. How must this code be changed to be thread-safe?

A. Replace StringBuilder with StringBuffer

B. Replace StringBuilder with just a String object and use the string concatenation (+=) within the log method.

C. No change is necessary, the current MyLogger code is already thread-safe.

D. Synchronize the log method

Asked In Java Jax (3 years ago)

Unsolved Read Solution (1)

Is this Puzzle helpful?   (0)   (0) Submit Your Solution

(#M40167126) JAVA QUESTION static import Keep an EYE

Identify the correct options from the classes provided below.
More than one may be correct.

A. import static edu.ABC.model.Account.*;
public class Loan {
public double getInterest() {
return INTEREST_RATE;
}
}

B. import static edu.ABC.model.Account ;
public class Loan {
public double getInterest() {
return INTEREST_RATE;
}
}

C. import edu.ABC.model.Account ;
public class Loan {
public double getInterest() {
return Account.INTEREST_RATE;
}
}

D. package edu.ABC.model;
public class Loan {
public double getInterest() {
return INTEREST_RATE;
}
}

Asked In Java Jax (3 years ago)

Unsolved Read Solution (1)

Is this Puzzle helpful?   (1)   (1) Submit Your Solution Arrays

(#M40018946) JAVA QUESTION Advanced JAVA questions Keep an EYE

void start() {
A a = new A();
B b = new B();
a.s(b);
b = null; /* Line 5 */
a = null; /* Line 6 */
System.out.println("start completed"); /* Line 7 */
}

When is the B object, created in line 3, eligible for garbage collection?

A. after line 5
B. after line 6
C. after line 7
D. There is no way to be absolutely certain.

Asked In Java (12 years ago)

Unsolved Read Solution (3)

Is this Puzzle helpful?   (10)   (0) Submit Your Solution Program