Java MCQ – Multiple Choice Questions and Answers – Strings – Part 1

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

1. Which of the following class is the superclass of String and StringBuffer class?

A ArrayList

B java.util

C java.lang

D java.string

2. Which of the following operators, we can use to concatenate two String?

A ||

B &

C +=

D +

String s = "Welcome" + " To" + "StackHowTo!";  
System.out.println(s); //Welcome To StackHowTo!

3. String in Java is a _________?

A object

B class

C reference

D array of character

4. What is the output of the following code?

public class Q4
{
    public static void main(String []args)
    {
        String s1 = new String("Ali");
        String s2 = new String("Alis");
        System.out.println(s1 = s2);
    }
}

A true

B false

C Ali

D Alis

5. Which of the following method is used to get the length of a String object?

A getSize()

B Sizeof()

C len()

D length()

String str = new String("Ali");
System.out.println(str.length()); //3

6. Which of the following method is used to get the character at specified index?

A getChar()

B Charat()

C charat()

D charAt()

String str = new String("Ali");
char c = str.charAt(0);
System.out.println(c); //A

7. What is the output of the following code?

public class Q7
{
    public static void main(String []args)
    {
        String s1 = new String("Hello");
        String s2 = new String(s1);
        System.out.println(s1 == s2);
    }
}

A Hello

B true

C false

D Error

8. Which of the following method is used to test tow strings for equality?

A checkEqual()

B eq()

C equals()

D equal()

9. What is the output of the following code?

public class Q8
{
    public static void main(String []args)
    {
		String s1 = "Hello";
		String s2 = "Hello";
		System.out.println(s1.equals(s2));
		System.out.println(s1 == s2);
    }
}

A false true

B true false

C false false

D true true

10. Which of the following affirmations are incorrect?

A Each string is an object of class String

B Strings in java are changeable

C String is a class

D Java defines a fellow class of String, called StringBuffer, which enables string to be modified

String str = new String("ABC");
str.concat("DEF");
System.out.println(str);

ABC

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