Java Objective Test
Free java Objective Test Question
जावा इस थे मोस्ट पॉपुलर लैंग्वेज इन थे वर्ल्ड
Free Java Project Mock Test
1 .class Base {}
class Derived extends Base {
public static void main(String args[]){
Base a = new Derived();
System.out.println(a instanceof Derived);
} }
Marked Answer :FALSECorrect
Answer : TRUE Total Marks : 2MARKS OBTAINED 0
2.Which of the following is not an operator in Java?
Marked Answer : >>>=
Correct Answer : sizeof
3. class Test {
public static void swap(Integer i, Integer j) {
Integer temp = new Integer(i); i = j;
j = temp; }
public static void main(String[] args) {
Integer i = new Integer(10);
Integer j = new Integer(20); swap(i, j);
System.out.println(“i = ” + i + “, j = ” + j);
} }
Marked Answer : i = 10, j = 20
Correct Answer : i = 10, j = 20
4.class Base
{
public final void show() {
System.out.println(“Base::show() called”);
} }
class Derived extends Base {
public void show() {
System.out.println(“Derived::show() called”); }
}
public class Main {
public static void main(String[] args)
{
Base b = new Derived();
b.show();
} }
Marked Answer : Compiler Error
Correct Answer : Compiler Error Total Marks : 2MARKS OBTAINED 2
5. Which of the following is/are true about packages in Java?
1) Every class is part of some package.
2 ) All classes in a file are part of the same package.
3) If no package is specified, the classes in the file go into a special unnamed package
4) If no package is specified, a new package is created with folder name of class and the class is put in this package.
Marked Answer : Only 1, 2 and 4
Correct Answer : Only 1, 2 and 3 Total
6. Which of the following is true about inheritance in Java?
1) Private methods are final.
2) Protected members are accessible within a package and inherited classes outside the package.
3) Protected methods are final.
4 ) W e cannot override private methods. Marked Answer : 2, 3 and 4
Correct Answer : 1, 2 and 4 Total Marks : 2MARKS OBTAINED 0
7. class demo {
int a, b, c;
demo(int a, int b, int c) {
this.a = a; this.b = b; } demo() {
a = b = c = 0;
}
demo operator+(const demo &obj) {
demo object;
object.a = this.a + obj.a;
object.b = this.b + obj.b; object.c = this.c + obj.c; return object; } }
class Test {
public static void main(String[] args) {
demo obj1 = new demo(1, 2, 3);
demo obj2 = new demo(1, 2, 3); demo obj3 = new demo();
obj3 = obj1 + obj2;
System.out.println (“obj3.a = ” + obj3.a);
System.out.println (“obj3.b = ” + obj3.c);
System.out.println (“obj3.c = ” + obj3.c); } }
Marked Answer : Compile Error Correct Answer :
Compile Error Total Marks :
8. Which of the following is FALSE about arrays on Java?
Marked Answer : Length of array can be changed after creation of array
Correct Answer : Length of array can be changed after creation of array
All Question are important in the java Developer to Develop in java programmig
Thanks:
by -er prince kumar
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