What is the size of StringBuffer?

Subclass of any class can be abstract

What is maximum thread priority in Java

vector implements

Comparable have a method called Comparator

Which class is the superclass of all other classes?

  Which of this keyword must be used to inherit a class 

what should be the output of this code block?

  public class abekus {

    public static void main(String[] args) {

      String input = null;

      System.out.println("-" + input.trim() + "-");

    }

  }

What is multithreaded programming?

Which of the following statements about access modifiers in object-oriented programming are incorrect?