Hands-On Design Patterns with Java

Programming the design pattern

The first class in our example is the GameMission class. As you can see, we have two class variables. The percentageCompleted int is private and the getPercentageCompleted() accessor method is used to obtain the variable's value. The second class variable is previousPercentageCompleted. This is assumed private to the current Java package; there is no associated accessor method for this variable:

public class GameMission {    // class variables    private int percentageCompleted;    int previousPercentageCompleted;    // constructor    public GameMission() {        percentageCompleted = 0;        previousPercentageCompleted = 0;    }    // mutator    public void setPercentageCompeted(int percentage) {        previousPercentageCompleted = percentageCompleted ...