Java OOPs MCQ Series 2nd, Java OOPs Concepts Test, Java OOPs Quiz

What are the two common characteristics shared by all objects?

When sub class declares a method that has the same type arguments as a method declared by one of its superclass,it is termed as

OOP promotes a way of programming that allows programmers to think in terms of:

When a class is based on another class, it inherits:

Method with the same name or different return type and difference in the parameters either in number or type is known as

An object that has more than one form is referred to as

Constructors are used to

What is a template, or specification, that defines a type of object?

Keyword which is used to access the method or member variables from the superclass

The process by which one object can acquire the properties of another object

hat will be the output of the following program?
1. public class Test1 {
2. static{
3. System.out.println(“Static”);
4. }
5. {
6. System.out.println(“Instance”);
7. }
8. public void Test1(){
9. System.out.println(“Constructor”);
10. }
11. public static void main(String[] args) {
12.
13. Test1 t = new Test1();
14. } }

1. class Foo {
2. public int left = 9;
3. public int right = 3;
4. public void setLeft(int leftNum) {
5. left = leftNum;
6. right = leftNum/3;
7. }
8. // lots of complex test code here
9. }
What is the problem with above code ?

Which Man class properly represents the relationship “Man has a best friend who is a “Dog”?

1. 11. interface DeclareStuff {
2. 12. public static final int EASY = 3;
3. 13. void doStuff(int t); }
4. 14. public class TestDeclare implements DeclareStuff {
5. 15. public static void main(String [] args) {
6. 16. int x = 5;
7. 17. new TestDeclare().doStuff(++x);
8. 18. }
9. 19. void doStuff(int s) {
10. 20. s += EASY + ++s;
11. 21. System.out.println(“s ” + s);
12. 22. }
13. 23. }
What is the result?

What will be the output?
1. public class Test6{
2. public Test6(){
3. this(4);
4. }
5. public Test6(byte var){
6. System.out.println(var);
7. }
8. public static void main(String[] args){
9. Test6 t6 = new Test6();
10. } }

1. public class LinePrinter {
2. public static void main(String[] args) {
3. // Note: u000A is Unicode representation of linefeed (LF)
4. char c = 0x000A;
5. System.out.println(c);
6. }
7. }
What it will print?

1. 11. public interface A111 {
2. 12. String s = “yo”;
3. 13. public void method1();
4. 14. }
5. 17. interface B { }
6. 20. interface C extends A111, B {
7. 21. public void method1();
8. 22. public void method1(int x);
9. 23. }
What is the result?

What will be the output of the following program?
1. public class Test3 {
2. public static void main(String[] args) {
3. System.out.println(“Main Method1”);
4. main(“think”);
5. }
6. public static void main(String args){
7. System.out.println(“Main Method2”);
8. }
9. }

What will be the output?
1. public class Test3{
2. public void method(){
3. System.out.println(“Called”); }
4. public static void main(String[] args){
5. method();
6. } }
Choose one:

What Java keyword do you use to define a class?