Java Terminology

Java Terminology

üEach point is an object

üEach includes three fields

üEach has three methods

üEach is an instance of the same class

Object-Oriented Style

üSolve problems using objects: little bundles of data that know

 how to do things to themselves.

üNot the computer knows how to move the point, but rather the 

point knows how to move itself.

üObject-oriented languages make this way of thinking and 

programming easier.

class Point {

  int xCoord;

  int yCoord;

  Point() {

  xCoord = 0;

  yCoord = 0;

  }

  int currentX() {

  return xCoord;

  }

  int currentY() {

  return yCoord;

  }

  void move (int newXCoord, int newYCoord) {

  xCoord = newXCoord;

  yCoord = newYCoord;

  }

}

The General Form of a Class

üA class is defined by specifying the data and the code that 

operate on the data.

üThe general form:

  class classname{

  type instance-variable1;

  type instance-variable2;

  …………

   type methodname1( parameter-list)

  {

  // body of the method

  }

  type methodname2( parameter-list)

  {

  //body of the method

  }

  ……………………

    }