Java Strings MCQs with answers Page - 3

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Q. What is the result of:
String s = null;
s += "Java";
System.out.println(s);

  • (A) Java
  • (B) nullJava
  • (C) null
  • (D) Runtime error

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Q. Which method replaces characters in a string?

  • (A) change()
  • (B) replace()
  • (C) substitute()
  • (D) alter()

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Q. What does this return?
"abcde".substring(2);

  • (A) ab
  • (B) abc
  • (C) cde
  • (D) de

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Q. How can you check if a string is empty?

  • (A) s.length() == 0
  • (B) s.isEmpty()
  • (C) s == ""
  • (D) All of the above

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Q. Which is true about the `==` operator for strings?

  • (A) It compares values
  • (B) It compares references
  • (C) It always returns true
  • (D) It throws exception if null

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Q. What does this print?
System.out.println("hello".toUpperCase());

  • (A) HELLO
  • (B) hello
  • (C) Hello
  • (D) Compile-time error

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Q. Which method returns the hash code of a string?

  • (A) hash()
  • (B) hashcode()
  • (C) getHash()
  • (D) hashCode()

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Q. What does equalsIgnoreCase() return?

  • (A) true or false
  • (B) 0 or 1
  • (C) true only
  • (D) an integer

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Q. Which of these is an immutable class?

  • (A) StringBuilder
  • (B) StringBuffer
  • (C) String
  • (D) None

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Q. What is printed?
System.out.println("abc" + 1 + 2);

  • (A) abc12
  • (B) abc3
  • (C) 3abc
  • (D) Compilation error

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