责任链模式 核心设计类 IBaseTask :

public abstract class IBaseTask {
    
    boolean isTask;
    
    IBaseTask iNextTask;
    
    public IBaseTask(boolean isTask){
        this.isTask = isTask; 
    }
    
    public void setNextTask(IBaseTask iNextTask) {
        this.iNextTask = iNextTask;
    }
    
    public void action() {
        if(isTask) {
            doAction();
        } else if(iNextTask!=null) {
            iNextTask.action();
        }
        
    }
    
    public abstract void doAction();
}

public class Task1 extends IBaseTask{

    public Task1(boolean isTask) {
        super(isTask); 
    }

    @Override
    public void doAction() {

         System.out.println("Task1 执行了");
    }

}

public class Task2 extends IBaseTask {

    public Task2(boolean isTask) {
        super(isTask); 
    }

    @Override
    public void doAction() {
         System.out.println("Task2 执行了");
    }

}

public class Task3 extends IBaseTask {
    
 

    public Task3(boolean isTask) {
        super(isTask); 
    }

    @Override
    public void doAction() {

         System.out.println("Task3 执行了");
    }

}

测试：

    public static void main(String[] args) {
         Task1 task1 = new  Task1(false);
         Task2 task2 = new  Task2(true);
         Task3 task3 = new  Task3(true);
         
         task1.setNextTask(task2);
         task2.setNextTask(task3);
         
         task1.action();
    }

执行结果：

Task2 执行了