INTERNATIONAL MAHARISHI UNIVERSITY 1971-1995
MAHARISHI UNIVERSITY
of MANAGEMENT
Engaging the Managing Intelligence of Nature
Lab 5:
State Pattern
State : Example without state pattern
public class Application { public class Person { static public void main(String args[]) { private String state; Person p=new Person(); public void setState(String st){ p.setState("hungry"); state=st; p.talk(); } p.setState("happy"); public void talk(){ p.talk(); if (state.equals("hungry")) p.setState("sleepy"); System.out.println("I want food"); p.talk(); else p.setState("dirty"); if (state.equals("sleepy")) p.talk(); System.out.println("I want to sleep"); } else } if (state.equals("dirty")) System.out.println("I need a bath"); else if (state.equals("happy")) System.out.println("I feel good"); } }
State : Example with state pattern
public class Application { static public void main(String args[]) { Person p=new HungryPerson(); p.talk(); p=new HappyPerson(); p.talk(); p=new SleepyPerson(); p=new p.talk(); DirtyPerson(); p.talk(); } } public interface Person { public void talk(); } public class DirtyPerson implements Person{ public void talk(){ System.out.println("I need a bath"); } } public class SleepyPerson implements Person{ public void talk(){ System.out.println("I want to sleep"); } } public class HappyPerson implements Person{ public void talk(){ System.out.println("I feel good"); } } public class HungryPerson implements Person{ public void talk(){ System.out.println("I want food"); } }
State : Lab
Shift car simulation speed x=0 0<x<5 5<x<10 10<x<30 30<x<55 x>5...