جافا Java
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6 164
What is the output of the following Java code snippet using polymorphism?
class Animal {
void sound() {
System.out.println("Animal makes a sound");
}
}
class Dog extends Animal {
void sound() {
System.out.println("Woof");
}
}
public class Test {
public static void main(String[] args) {
Animal myAnimal = new Dog();
myAnimal.sound();
}
}
6 164
What will be the output of the following Java code snippet that demonstrates the use of static variables?
class Counter {
static int count = 0;
Counter() {
count++;
System.out.println(count);
}
}
public class TestCounter {
public static void main(String[] args) {
Counter c1 = new Counter();
Counter c2 = new Counter();
Counter c3 = new Counter();
}
}
6 164
Correct the error in the following Java code snippet to properly encapsulate the 'name' field.
class Person {
public String name; // This should be encapsulated
public String getName() {
return name;
}
public void setName(String newName) {
this.name = newName;
}
}
6 164
Which of the following is a valid Java statement to check if 'x' is either 10 or 20?
6 164
What is the output of the following Java code snippet demonstrating the concept of method overriding?
class Vehicle {
void run() {
System.out.println("Vehicle is running");
}
}
class Bike extends Vehicle {
void run() {
System.out.println("Bike is running safely");
}
}
public class Test {
public static void main(String[] args) {
Bike obj = new Bike();
obj.run();
}
}
6 164
Identify and correct the error in the following Java code snippet to demonstrate the correct use of an abstract class.
abstract class Animal {
abstract void eat();
}
class Dog extends Animal {
void eat() {
System.out.println("Dog eats");
}
}
public class TestAnimal {
public static void main(String[] args) {
Animal a = new Dog();
a.eat();
}
}
6 164
Which keyword is used by the method to refer to the object that invoked it?
6 164
Which of the following is a valid declaration of an object of class Box?
6 164
Which concept of Java is a way of converting real world objects in terms of class?
6 164
What is the output of the following Java code snippet demonstrating the concept of method overriding?
class Vehicle {
void run() {
System.out.println("Vehicle is running");
}
}
class Bike extends Vehicle {
void run() {
System.out.println("Bike is running safely");
}
}
public class Test {
public static void main(String[] args) {
Bike obj = new Bike();
obj.run();
}
}
6 164
Which of the following is not a valid way to create an instance of a class named `MyClass` in Java?
6 164
Consider the following Java code snippet. What will be the output?
class Base {
void display() {
System.out.println("Base display()");
}
}
class Derived extends Base {
void display() {
System.out.println("Derived display()");
}
}
public class Test {
public static void main(String[] args) {
Base obj = new Derived();
obj.display();
}
}
6 164
What is the output of the following Java code?
```java
System.out.println(10 > 9); ```
6 164
In Java, what is a 'package' and how is it used?
في جافا، ما هو 'الحزمة' وكيف يتم استخدامها؟
