碼仔漫畫：做個(gè)審批流程，被領(lǐng)導(dǎo)怒懟“什么玩意兒”！

public class LeaveApproval {
public static void main(String[] args) {
    ExpenseReimbursement maNiuApply = new ExpenseReimbursement();
     maNiuApply.setName("Ma Niu");
    maNiuApply.setAmount(-100);

    if (maNiuApply.getAmount() < 0 ) {
        System.out.println("Amount error!");
    } else if (maNiuApply.getAmount() <= 500) {
        projectManagerHandle(maNiuApply);
     } else if (maNiuApply.getAmount() <= 1000) {
        departmentManagerHandle(maNiuApply);
    }else {
        managingDirectorHandle(maNiuApply);
     }
 }

  public static void projectManagerHandle(ExpenseReimbursement expense) {
     System.out.println("Project manager approved " + expense.getAmount());
   }

  public static void departmentManagerHandle(ExpenseReimbursement expense) {
    System.out.println("Department manager approved " + expense.getAmount());
   }

  public static void managingDirectorHandle(ExpenseReimbursement expense) {
    System.out.println("Managing director approved " + expense.getAmount());
   }
}

public class ChainOfResponsibilityPattern {

public static void main(String[] args) {
    //組裝責(zé)任鏈
    Handler handler1 = new ConcreteHandler1();
    Handler handler2 = new ConcreteHandler2();
    handler1.setNext(handler2);
    //提交請求
    handler1.handleRequest("two");
   }
}

//抽象處理者角色
abstract class Handler {

private Handler next;
   public void setNext(Handler next) {
      this.next = next;
   }

   public Handler getNext() {
      return next;
   }

   //處理請求的方法
   public abstract void handleRequest(String request);
}

//具體處理者角色1
class ConcreteHandler1 extends Handler {
   @Override
   public void handleRequest(String request) {
       if (request.equals("one")) {
         System.out.println("ConcreteHandler1 handler！");
       } else {
       if (getNext() != null) {
           getNext().handleRequest(request);
       } else {
           System.out.println("None handler！");
           }
       }
   }
}

//具體處理者角色2
class ConcreteHandler2 extends Handler {
   @Override
   public void handleRequest(String request) {
      if (request.equals("two")) {
            System.out.println("ConcreteHandler2 handler！");
      } else {
      if (getNext() != null) {
         getNext().handleRequest(request);
      } else {
        System.out.println("None handler！");
      }
      }
   }
}