Java Method generally.

Java Methods generally

• All methods will always be defined within the body of a class.
• They can contain local variable declarations.
• They will contain java statements that are executed when the method is invoked.
• Methods may return one value which can be one of:
  1. a primitive type (double, int, float, char etc.).
  2. a reference type (to an object of a class or an array of objects)
  3. or the type void, which indicates that no value will be returned.
• Methods can take arguments of same type as the return types – except void.
  Example class file: Bird.java:

  
  class Bird {
  
    int xPos;
  
    double fly(int x, int y) {
      // distance is a local variable for the method
      double distance = Math.sqrt(x * x + y * y);
      // the local variable,xPos, shadows or hides 
      // the name of the instance variable 
      int xPos = x;
      // You can use the special reference this operator 
      // any time you need to refer explicitly to the current object 
      this.xPos = y;
      return distance;
    }
  }