State_Pattern

最新推荐文章于 2025-04-24 00:16:34 发布

TheHarrySky

最新推荐文章于 2025-04-24 00:16:34 发布

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分类专栏： Java 文章标签： state_pattern design_pattern java

本文链接：https://blog.youkuaiyun.com/GZHarryAnonymous/article/details/82829778

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本文深入探讨了状态模式的设计理念，通过具体代码示例展示了如何使用状态模式来管理对象的行为变化，特别是在运行时依赖于其状态的情况下。文章通过定义抽象状态类和具体状态类，配合上下文类，实现了状态之间的无缝切换。

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package state_pattern;

public abstract class State {
public abstract void Handle(Context context);
}

package state_pattern;

public class ConcreteStateA extends State{
@Override
public void Handle(Context context) {//It implements the logic between related state.
context.setState(new ConcreteStateB());//The current state decide the next state.
}
}

package state_pattern;

public class ConcreteStateB extends State{
@Override
public void Handle(Context context) {
context.setState(new ConcreteStateA());
}
}

package state_pattern;

public class Context {
private State state;
public Context(State state) {
this.state = state;
}
public State getState() {
return state;
}
public void setState(State state) {
this.state = state;
System.out.println("The current state is " + this.state.getClass().getName());
}
public void request() {
state.Handle(this);//The current class object as the parameter communicate
//with state.The dynamic binding instead of "switch-case".
}
}

package state_pattern;

public class Main {
public static void main(String args[]) {
Context c = new Context(new ConcreteStateA());
c.request();
c.request();
c.request();
c.request();
}
}
/*
* The current object's behavior is related to its state during the runtime.
*/

This is a general introduction to the 23 design patterns：
https://blog.youkuaiyun.com/GZHarryAnonymous/article/details/81567214

See more source code:[GZHarryAnonymous](https://github.com/GZHarryAnonymous/Design_Pattern)