現在寫一個用狀態模式實現的根據上班時間狀態變化而行為變化的小程序，當時間<12上午上班時間，
<13午休時間，<17下午上班時間，<21加班時間，根據時間不同，條用的類方法不同。
狀態模式適用于當對象的狀態改變時，行為也改變，就可以使用狀態模式
狀態接口：
public interface State {
void writeProgram(Work work);
}
不同的實現類：
public class AfterNoonState implements State {
@Override
public void writeProgram(Work work) {
if(work.getHour()<17){
System.out.println("工作");
}else {
work.setCurrent(new EveningState());
work.writeProgram();
}
}
}
public class EveningState implements State {
@Override
public void writeProgram(Work work) {
if(work.isFinish()){
work.setCurrent(new RestState());
work.writeProgram();
}else {
if(work.getHour()<21){
System.out.println("加班");
}else {
work.setCurrent(new SleepState());
work.writeProgram();
}
}
}
}
public class ForenoonState implements State {
@Override
public void writeProgram(Work work) {
if(work.getHour()<12){
System.out.println("工作時間");
}else {
work.setCurrent(new NoonState());
work.writeProgram();
}
}
}
public class NoonState implements State {
@Override
public void writeProgram(Work work) {
if(work.getHour()<13){
System.out.println("午睡");
}else {
work.setCurrent(new AfterNoonState());
work.writeProgram();
}
}
}
public class RestState implements State {
@Override
public void writeProgram(Work work) {
System.out.println("回家");
}
}
public class SleepState implements State {
@Override
public void writeProgram(Work work) {
System.out.println("睡覺");
}
}
調用狀態的類：
public class Work {
private State current;
public Work(double hour,boolean finish){
current = new ForenoonState();
this.hour = hour;
this.finish = finish;
}
private double hour;
public double getHour() {
return hour;
}
public State getCurrent() {
return current;
}
public void setCurrent(State current) {
this.current = current;
}
private boolean finish;
public boolean isFinish() {
return finish;
}
public void writeProgram(){
current.writeProgram(this);
}
}
測試類：
public class Test {
public static void main(String[] args) {
Work work = new Work(20, true);
work.writeProgram();
}
}