Java Abstract Class Examples

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1. How to create an abstract Class and its sub classes
2. How to create a static method in abstract Class

1. How to create an abstract Class and its sub classes

package basics;

public abstract class AbstractClassExample {

 public static void main(String[] args) {
  Lion lion = new Lion("Mr Lion", 4);
  lion.printName();
  System.out.println(lion.canWalkWithTwoLegs());

  Bear bear = new Bear("Mr Bear", 4);
  bear.printName();
  System.out.println(bear.canWalkWithTwoLegs());
 }
}

abstract class Animal {
  private String name = null;
 private int numberOfLegs = 0;

 public Animal(String name, int numberOfLegs) {
  super();
  this.name = name;
  this.numberOfLegs = numberOfLegs;
 }

 public abstract boolean canWalkWithTwoLegs();

 public void printName() {
  System.out.println("Name is: " + name);
 }
}

class Lion extends Animal {

 public Lion(String name, int numberOfLegs) {
  super(name, numberOfLegs);
 }

 public boolean canWalkWithTwoLegs() {
  return false;
 }
}

class Bear extends Animal {

 public Bear(String name, int numberOfLegs) {
  super(name, numberOfLegs);
 }

 public boolean canWalkWithTwoLegs() {
  return true;
 }
}

There will be a zip file created at

Name is: Mr Lion
false
Name is: Mr Bear
true

2. How to create a static method in abstract Class

package basics;

public abstract class AbstractClassExample {

 public static void main(String[] args) {
     AbstractClassExample.doSomeThing();
   }

   public static void doSomeThing() {
     System.out.println("What can i do?");
   }
 }

There will be a zip file created at

What can i do?