Java MCQ – Multiple Choice Questions and Answers – Strings – Part 2

This collection of Java Multiple Choice Questions and Answers (MCQs): Quizzes & Practice Tests with Answer focuses on “Java Strings”.
 

1. Which of the following constructors is used to create an empty String object?

A String()

B String(null)

C String(” “)

D None of the above

String s = new String(); // empty object is created

2. What is the output of the following code?

public class Q2
{
    public static void main(String []args)
    {
        char chars[] = {'b', 'o', 'b'};
        String str = new String(chars);
        System.out.println(str);
    }
}

A b

B o

C bob

D Error

3. What is the output of the following code?

public class Q3
{
    public static void main(String []args)
    {
        String str = "I LOVE JAVA";   
        System.out.println(str.charAt(4));
    }
}

A O

B V

C E

D L

4. What is the output of the following code?

public class Q4
{
    public static void main(String []args)
    {
        String str = "I LOVE JAVA";   
        System.out.println(str.length());
    }
}

A 11

B 10

C 12

D 9

5. What is the output of the following code?

public class Q5
{
    public static void main(String []args)
    {
		String str1 = "Emily";
		String str2 = "Alex";
		System.out.println(str1.charAt(0) > str2.charAt(0));
    }
}

A true

B false

C 0

D 1

6. What is the output of the following code?

public class Q6
{
    public static void main(String []args)
    {
		String a = "lorem";
		int b = 8;
		System.out.println(a += b);
    }
}

A 8lorem

B lorem8

C Compilation error

D Will throw an exception

7. The String method compareTo() returns _______.

A 1

B -1

C false

D true

E Int value

8. What is the output of the following code?

public class Q8
{
    public static void main(String []args)
    {
        String str = "hello";
        System.out.println(str.substring(1, 4)); 
    }
}

A hel

B ell

C llo

D hell

9. What is the output of the following code?

public class Q9
{
    public static void main(String []args)
    {
        String str = "Hello";
        System.out.println(str.indexOf('a'));
    }
}

A 0

B -1

C false

D Compilation error

10. What is the output of the following code?

public class Q10
{
    public static void main(String []args)
    {
		String s1 = "Stack";
		String s2 = "HowTo";
		System.out.println(s1.concat(s2));
    }
}

A Stack

B HowTo

C StackHowTo

D Compilation error

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