What is the output from the following code(Vector class)? : Questions « Utility Classes « SCJP

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SCJP » Utility Classes » Questions

8.32.21.What is the output from the following code(Vector class)?

import java.util.*;

      class Question {

       public static void main(String args[]) {

        String s1 = "abc";

        String s2 = "def";

        Vector v = new Vector();

        v.add(s1);

        v.add(s2);

        String s3 = v.elementAt(0) + v.elementAt(1);

        System.out.println(s3);

       }

      }

8.32.Questions
	8.32.1.	The Object class is final(True/False).
	8.32.2.	Answer: Object class and final
	8.32.3.	The Class class can be used to load other classes(True/False).
	8.32.4.	Answer: class loader
	8.32.5.	The ClassLoader class can be used to load other classes(True/False).
	8.32.6.	Answer: ClassLoader and class loading
	8.32.7.	Which of the following classes is used to perform basic console I/O?
	8.32.8.	Answer: console I/O
	8.32.9.	Which of the following is not a wrapper class?
	8.32.10.	Answer: wrapper class
	8.32.11.	What is the output from the following code(Boolean class and if statement)?
	8.32.12.	Answer: Boolean class and if statement
	8.32.13.	What is the output of the following program(string concatenation)?
	8.32.14.	Answer: string concatenation
	8.32.15.	Which of the following methods are methods of the Math class?
	8.32.16.	Answer: Math class
	8.32.17.	Error and Exception classes extend Throwable(True/False).
	8.32.18.	Answer: Error and Exception
	8.32.19.	The Integer class extends the Number class(True/False).
	8.32.20.	Answer: Integer class and Number class
	8.32.21.	What is the output from the following code(Vector class)?
	8.32.22.	Answer: Vector class
	8.32.23.	What is the output from the following code(Stack)?
	8.32.24.	Answer: Stack
	8.32.25.	Which of the following extend the Collection interface?
	8.32.26.	Answer: Collection interface
	8.32.27.	Which of the following may have duplicate elements?
	8.32.28.	Answer: collection allowing duplicate elements
	8.32.29.	Can a null value be added to a List?
	8.32.30.	Answer: null value and List
	8.32.31.	What is the output of the following program(HashSet)?
	8.32.32.	Answer: HashSet
	8.32.33.	What is the output of the following program(TreeMap)?
	8.32.34.	Answer: TreeMap
	8.32.35.	Which statements could be inserted at // INSERT DECLARATION HERE to allow this code to compile and run?
	8.32.36.	Answer: generic List
	8.32.37.	What is the output(generic TreeSet)?
	8.32.38.	Answer: generic TreeSet
	8.32.39.	What is the output(Generic Map)?
	8.32.40.	Answer: Generic Map

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