1. // 抽象状态,每种状态对应一种行为
    2. public abstract class State {
    4.    public abstract void WriteProgram(Work w);
    5. }
    6. // 上午工作状态
    7. public class ForenonState extends State {
    9.     @Override
    10.     public void WriteProgram(Work w) {
    11.          if(w.Hour<12){
    12.              System.out.println("当前时间:"+w.Hour+"，上午工作，精神百倍");
    13.          }else{
    14. //             超过12点，则转入中午工作状态
    15.              w.SetState(new NoonState());
    16.              w.WriteProgram();
    17.          }
    18.     }
    20. }
    22. // 下午工作状态
    23. public class AfternoonState extends State {
    25.     @Override
    26.     public void WriteProgram(Work w) {
    27.          if(w.Hour<18){
    28.              System.out.println("当前时间:"+w.Hour+"，下午工作状态还不错，继续努力");
    29.          }else{
    30. //             超过18点，则转入晚间工作状态
    31.              w.SetState(new EveningState());
    32.              w.WriteProgram();
    33.          }
    34.     }
    36. }
    37. // 晚间工作状态
    38. public class EveningState extends State {
    40.     @Override
    41.     public void WriteProgram(Work w) {    
    42.         if(w.TaskFinished){
    43.             w.SetState(new RestStae());
    44.             w.WriteProgram();
    45.         }else{
    47.              if(w.Hour<=22){
    48.                  System.out.println("当前时间:"+w.Hour+"，加班哦，疲惫至极");
    49.              }else{
    50. //                 超过21点，则转入睡眠状态
    51.                  w.SetState(new SleepingState());
    52.                  w.WriteProgram();
    53.              }    
    54.         }    
    55.     }
    57. }
    58. // 下班休息状态
    59. public class RestStae extends State {
    61.     @Override
    62.     public void WriteProgram(Work w) {
    64.             System.out.println("当前时间:"+w.Hour+"，下班了回家了");
    66.     }
    68. }
    69. // 睡眠状态
    70. public class SleepingState extends State {
    72.     @Override
    73.     public void WriteProgram(Work w) {
    75.         System.out.println("当前时间:"+w.Hour+"，不行了，睡着了");
    77.     }
    79. }
    80. // 工作,定义当前状态    
    81. public class Work {
    83.     private State currentState;
    85.     public Work(){
    86.        currentState = new ForenonState();    
    87.     }
    89.     public int Hour;
    91.     public boolean TaskFinished;
    93.     public void SetState(State state){
    94.         currentState=state;
    95.     }
    97.     public void WriteProgram(){
    98. //        设置状态，判断状态是否和当前一致,是否能处理，不是再下一个
    99.         currentState.WriteProgram(this);
    100.     }
    102. }
    103. public class Test {
    105.         public static void main(String[] args) {
    106.             Work work =new Work();
    107.             work.Hour=9;
    108.             work.WriteProgram();
    109.             work.Hour=13;
    110.             work.WriteProgram();
    111.             work.Hour=14;
    112.             work.WriteProgram();
    113.             work.Hour=20;
    114.             work.WriteProgram();
    115. //            work.TaskFinished=true;
    116.             work.Hour=23;
    117.             work.WriteProgram();
    118.         }
    119. }