Java Quiz set 3

import java.io.*;

public class Main

{

public static void main(String[] args)

{

int x = 5;

int y = 2;

int z = (x++) * (--y) + (x + y);

System.out.println("The value of z is: " + z);

    }

}

• 13

• 14

• 12

• 10

public class Example

{

public static void main(String[] args)

{

String str1 = "Java";

String str2 = new String("Java");

System.out.println(str1 == str2);

}

}

• True
• False
• compile time error
• run time error

Which of the following is not a valid declaration of the main method in Java?

• public static void main(String[] args)
• public static void main(String args[])
• public static void main(String[]...args)
• public void main(String[] args)

What is the purpose of the super keyword in Java?

• To refer to the superclass object
• To create an instance of a class
• To access the static members of a class
• To define an abstract method

public class Example

{

public static void main(String[] args)

{

int a = 10;

int b = 20;

int result = (a > b) ? a++ : ++b;

System.out.println(result);

}

}

• 11.0
• 10.0
• 21.0
• 20.0

In Java, which collection class is synchronized?

• ArrayList
• LinkedList
• HashSet
• Vector

public class Example

{

public static void main(String[] args)

{

int x = 5;

int y = 2;

System.out.println(x-- - --y * 2 + (x += 2));

}

}

• 7.0
• 6.0
• 9.0
• 8.0

What is the purpose of the equals method in Java?

• To compare the references of two objects.
• To compare the contents of two objects.
• To check if an object is null.

What is the purpose of the finally block in a Java try-catch-finally statement?

• To catch exceptions thrown in the try block.
• To execute code regardless of whether an exception is thrown or not.
• To declare and initialize variables.
• To specify multiple catch blocks.

What is the default value of a variable of type char in Java?

• 0'
• \0'
• None
• " "