策略模式

public class ttt {

    public static void main(String[] args) {
        ProduceContext pc = new ProduceContext(new Winter());
        pc.GetDecision(555);
    }
}
//父类
interface ProduceStrategy{
    void Decision(int capital);
}
//冬季
class Winter implements ProduceStrategy{

    @Override
    public void Decision(int capital) {
        System.out.println("冬季"+capital);
    }
    
}
//夏季
class Summer implements ProduceStrategy{

    @Override
    public void Decision(int capital) {
        System.out.println("夏季"+capital);
    }
    
}
//重要一环
class ProduceContext{
    private ProduceStrategy ps;
    //生产上下文
    public ProduceContext(ProduceStrategy ps) {
        this.ps = ps;
    }
    //如何决策
    public void GetDecision(int capital) {
        ps.Decision(capital);
    }
}

输出：

      冬季555