1. Which of this method of class String is used to extract a substring from a String object?

a) substring()

b) Substring()

c) SubString()

d) None of the mentioned

2. What will s2 contain after following lines of Java code?

String s1 = "one";

String s2 = s1.concat("two")

a) one

b) two

c) onetwo

d) twoone

3. Which of these method of class String is used to remove leading and trailing whitespaces?

a) startsWith()

b) trim()

c) Trim()

d) doTrim()

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4. What is the value returned by function compareTo() if the invoking string is greater than the string compared?

a) zero

b) value less than zero

c) value greater than zero

d) none of the mentioned

5. Which of the following statement is correct?

a) replace() method replaces all occurrences of one character in invoking string with another character

b) replace() method replaces only first occurrences of a character in invoking string with another character

c) replace() method replaces all the characters in invoking string with another character

d) replace() replace() method replaces last occurrence of a character in invoking string with another character

6. What will be the output of the following Java program?

class output

{

public static void main(String args[])

{

String c = "Hello World";

String s = c.trim();

System.out.println("\""+s+"\"");

}

}

a) ""Hello World""

b) ""Hello World"

c) "Hello World"

d) Hello world

7. What will be the output of the following Java program?

class output

{

public static void main(String args[])

{

String s1 = "one";

String s2 = s1 + " two";

System.out.println(s2);

}

}

a) one

b) two

c) one two

d) compilation error

8. What will be the output of the following Java program?

class output

{

public static void main(String args[])

{

String s1 = "Hello";

String s2 = s1.replace('l','w');

System.out.println(s2);

}

}

a) hello

b) helwo

c) hewlo

d) hewwo

9. What will be the output of the following Java program?

class output

{

public static void main(String args[])

{

String s1 = "Hello World";

String s2 = s1.substring(0 , 4);

System.out.println(s2);

}

}

a) Hell

b) Hello

c) Worl

d) World

10. What will be the output of the following Java program?

class output

{

public static void main(String args[])

{String s = "Hello World";

int i = s.indexOf('o');

int j = s.lastIndexOf('l');

System.out.print(i + " " + j);

}

}

a) 4 8

b) 5 9

c) 4 9

d) 5 8