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状态

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状态是行为设计​​模式之一,其中类的行为根据其状态而变化。

关键概念
上下文:行为根据状态变化的类/对象
状态:抽象状态
具体状态:代表各种状态,它改变context类的行为。

让我们通过一个例子来理解这一点:

state.java

public interface state {
    public void doaction(context context);
}

国家具体实施

public class startstate implements state {
    private context context;
    public startstate(){}
    @override
    public void doaction(context context){
        this.context = context;
        this.context.setstate(this);
        system.out.println("player is in startstate");
    }

    public string tostring(){
        return "start state";
    }
}

public class endstate implements state {
    private context context;
    public endstate(){}
    @override
    public void doaction(context context){
        this.context = context;
        this.context.setstate(this);
        system.out.println("player is in endstate");
    }

    public string tostring(){
        return "end state";
    } 
}

主要

public class main {
    public static void main(string args[]){
        context context = new context();
        state state = new startstate();
        state.doaction(context);
        //current state
        system.out.println(context.getstate().tostring());

        state state2 = new endstate();
        state2.doaction(context);
        //new state
        system.out.println(context.getstate().tostring());
    }
}

输出:

Player is in StartState
Start State
Player is in EndState
End State

注意:以上代码遵循isp、lsp、srp、ocp的扎实原则

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