责任链模式

设置一个责任链抽象总承

public abstract class AbstractChain {
    protected  AbstractChain nextAbstractChain;
    public AbstractChain setNextChain(AbstractChain abstractChain) {
        this.nextAbstractChain = abstractChain;
        return abstractChain;
    }
    public void next(Object obj) {
        hander(obj);
        if (Objects.nonNull(nextAbstractChain)) {
            nextAbstractChain.next(obj);
        }
    }
    public abstract void hander(Object obj);
}

编写实现类

public class LogHander extends AbstractChain {
    @Override
    public void hander(Object obj) {
        System.out.println("责任链开始");
    }

    public static class Log1Hander extends AbstractChain {
        @Override
        public void hander(Object obj) {
            System.out.println("1");
        }
    }
    public static class Log2Hander extends AbstractChain {
        @Override
        public void hander(Object obj) {
            System.out.println("2");
        }
    }
    public static class Log3Hander extends AbstractChain {
        @Override
        public void hander(Object obj) {
            System.out.println("3");
        }
    }
}

编写测试类

public class MainTest {
    public static void main(String[] args) {
        LogHander logHander = new LogHander();
        LogHander.Log1Hander log1Hander = new LogHander.Log1Hander();
        LogHander.Log2Hander log2Hander = new LogHander.Log2Hander();
        LogHander.Log3Hander log3Hander = new LogHander.Log3Hander();
        logHander.setNextChain(log1Hander).setNextChain(log2Hander).setNextChain(log3Hander);
        logHander.next("obj");
    }
}

结果