设计模式（java）--状态模式

package tm;

import java.io.IOException;
//1, 接口 State.java
interface State {
     void handle(Client machine);
 }
//2, 具体状态一开始， StartState.java
class StartState implements State {

    public void handle(Client machine) {
        System.out.println("Start to process...");
        machine.setCurrentSate(new DraftState());
    }
}
//3, 具体状态二草稿，DraftState.java
class DraftState implements State {

    public void handle(Client machine) {
        System.out.println("Draft...");
        machine.setCurrentSate(new PublishState());
    }
}
//4, 具体状态三发布，PublishState.java
class PublishState implements State {

    public void handle(Client machine) {
        System.out.println("Publish...");
        machine.setCurrentSate(new CompletedState());

    }
}
//5, 具体状态四完成，CompletedState.java
class CompletedState implements State {

    public void handle(Client machine) {
        System.out.println("Completed");
        machine.setCurrentSate(null);
    }
}

//6, 状态容器 及客户端调用, StateMachine.java
public class Client {
    private State currentSate;

    public State getCurrentSate() {
        return currentSate;
    }

    public void setCurrentSate(State currentSate) {
        this.currentSate = currentSate;
    }
    
    public static void main(String[] args) throws IOException {
        Client machine = new Client();
        State start = new StartState();
        machine.setCurrentSate(start);
        while(machine.getCurrentSate() != null){
            machine.getCurrentSate().handle(machine);
        }
        
        System.out.println("press any key to exit:");
        System.in.read();
    }
}