Java super keyword tutorial

• super can use to call immediate parent class constructor.

  public class Shape {
      private String name;
      private String color;
  
      public Shape(String name, String color) {
          this.name = name;
          this.color = color;
      }
  }
  
  public class Square extends Shape {
      private int lengthOfSide;
  
  
      public Square(String name, String color, int lengthOfSide) {
          super(name, color);
  
          this.lengthOfSide = lengthOfSide;
      }
  }




• super can use to call immediate parent class methods.

  public class Shape {
      private String name;
      private String color;
  
      public Shape(String name, String color) {
          this.name = name;
          this.color = color;
      }
  
      protected void printShape() {
          System.out.println("Printing a " + name);
          System.out.println("Color of the " + name + " is " + color);
      }
  }
  
  public class Square extends Shape {
      private int lengthOfSide;
  
  
      public Square(String name, String color, int lengthOfSide) {
          super(name, color);
  
          this.lengthOfSide = lengthOfSide;
      }
  
      public void printSquare() {
          super.printShape();
  
          System.out.println("Length of a side is " + lengthOfSide);
      }
  }




• super can use to call immediate parent class instant variables.

  public class Shape {
      protected String name;
      protected String color;
  
      public Shape(String name, String color) {
          this.name = name;
          this.color = color;
      }
  }
  
  public class Square extends Shape {
      private int lengthOfSide;
  
  
      public Square(String name, String color, int lengthOfSide) {
          super(name, color);
  
          this.lengthOfSide = lengthOfSide;
      }
  
      public void printSquare() {
          System.out.println("Printing a " + super.name);
          System.out.println("Color of the " + super.name + " is " + super.color);
          System.out.println("Length of a side is " + lengthOfSide);
      }
  }

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