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:
    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;
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