• Placement Questions

Frequently Asked Interview Questions and Answers

(#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)

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(#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)

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(#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)

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(#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)

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(#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)

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(#M40167134) JAVA QUESTION throw keyword Keep an EYE

What will be the output of the program?

public class RTExcept
{
public static void throwit ()
{
System.out.print("throwit ");
throw new RuntimeException();
}
public static void main(String [] args)
{
try
{
System.out.print("hello ");
throwit();
}
catch (Exception re )
{
System.out.print("caught ");
}
finally
{
System.out.print("finally ");
}
System.out.println("after ");
}
}

A. hello throwit caught finally after
B. Compilation fails
C. hello throwit RuntimeException caught after
D. hello throwit caught

Asked In Java Jax (3 years ago)

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(#M40167133) JAVA QUESTION try, catch and finally Keep an EYE

Which of the given fact(s) are true with respect to the blocks and order of execution of blocks in "Exceptions"?

A. The try block can be followed by finally block and then followed by the catch blocks
B. One or more catch blocks which are exception handlers are placed immediately after the try block
C. Catch block has an argument which can accept an argument of any exception type and it is the name of a class that inherits from the Throwable class
D. The finally block always executes when the try block exits or when an exception occurs
E. The finally block is not executed when there is a return statement in the try block

Asked In Java Jax (3 years ago)

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(#M40167131) JAVA QUESTION Exceptions Keep an EYE

Observe the code.

public class Sample {

public static void main(String args[]) {

int i=10,j=0,k;

try {

k=i/j;

}

catch(Exception e) {

System.out.println("Exception");

}

catch(ArithmeticException e) {

System.out.println("Arithmetic exception");

}

}

}

Predict the output.

A. ArithmeticException
B. Compilation Fails
C. Exception
ArithmeticException
D. Runtime exception

Asked In Java Jax (3 years ago)

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(#M40167136) JAVA QUESTION Checked vs unchecked Exceptions Keep an EYE

_____ exceptions are automatically propagated. To propogate _____ exceptions, the method should explicitly throw the exception using the throws keyword.

A. checked, unchecked
B. unchecked, checked

Asked In Java Jax (3 years ago)

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(#M40167130) JAVA QUESTION finally block Keep an EYE

finally block will get executed whether or not an exception occurs. State True or False

Asked In Java Jax (3 years ago)

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