Quiz on StringBuilder Class in Java

What is the key feature of the StringBuilder class?

Which package contains the StringBuilder class?

Which is more efficient for multiple string concatenations?

What will be the output?

StringBuilder sb = new StringBuilder(“Hi”);
sb.append(” Java”);
System.out.println(sb);

Which method is used to reverse a string in StringBuilder?

What is the default capacity of a StringBuilder?

What does the capacity() method return?

Which of the following is true about StringBuilder?

What is the output?

StringBuilder sb = new StringBuilder(“Code”);
sb.insert(2, “123”);
System.out.println(sb);

What does delete(2, 4) do in StringBuilder?

Which method replaces a part of the content?

What will be printed?

StringBuilder sb = new StringBuilder(“Hello”);
sb.setCharAt(1, ‘a’);
System.out.println(sb);

Which method reduces the capacity to match the current length?

Which of the following creates an empty StringBuilder?

Which method is used to clear the contents of a StringBuilder?