Yes, abstract class have constructors in java. But it is not used to instantiate abstract class. It is used in constructor chaining or to initialize abstract class common variables. Example: abstract class DisplayTest { protected final String website; abstract void display(String str); DisplayTest(String website){ this.website = website; } } public class Main extends … Read more
Abstract class and interface both of these are used to achieve abstraction where the abstract method can be declared. Abstract class and interface both of these cannot be instantiated. But there are many variations between abstract class and interface which are given below. Abstract class Interface It can have method body (non-abstract methods) i.e. … Read more
No, we cannot declare final interface in java because its implementation is provided by another class and final interface can not be implemented. Example final interface SubtractionTest { void subtraction(int num1, int num2); } public class Main implements SubtractionTest { public void subtraction(int num1, int num2) { System.out.println(num1 – num2); } … Read more
No, we cannot declare an interface method static in java because interface methods are abstract by default, and static and abstract keywords can’t be used together. Example interface SubtractionTest { static void subtraction(int num1, int num2); } public class Main implements SubtractionTest { void subtraction(int num1, int num2) { System.out.println(num1 – num2); … Read more
No, we cannot override non static method as static method in java. class ShowTest { void show() { System.out.println("Inside super class method"); } } public class Main extends ShowTest { static void show() { System.out.println("Inside sub class method"); } public static void main(String[] args) { Main.show(); } }class ShowTest { void show() … Read more
No, we cannot override the private methods because private methods will not be inherited to sub class. Example class SubtractionTest { private void subtraction(int num1, int num2) { System.out.println("Inside super class method"); System.out.println(num1 – num2); } } public class Main extends SubtractionTest { public static void main(String[] args) { Main main … Read more
There are numerous contrasts between technique Method overloading and Method overriding in java. A rundown of contrasts between technique method overloading and method overriding are given underneath: Method Overloading Method Overriding It represents compile time polymorphism. It represents run time polymorphism. Method overloading provides a way to increase the readability of the program. Method … Read more
No, Static methods can’t be overridden because they are associated with class not with the object. class MultiplicationTest { public static void multiplication(int num1, int num2) { System.out.println(num1 * num2); } } public class Main extends MultiplicationTest { public void multiplication(int num1, int num2) { System.out.println(num1 * num2); } public static void … Read more
Yes, we can override a method which is overloaded in super class. Example class MultiplicationTest { public void multiplication(int num1, int num2) { System.out.println(num1 * num2); } public void multiplication(int num1, int num2, int num3) { System.out.println(num1 * num2 * num3); } } public class Main extends MultiplicationTest { public void multiplication(int … Read more
Yes, we can declare overloaded methods as final. class SumTest { public final void sum(int num1, int num2) { System.out.println(num1 + num2); } public void sum(int num1, int num2, int num3) { System.out.println(num1 + num2 + num3); } } public class Main { public static void main(String[] args) { SumTest sumTest = … Read more