Question

我试图在类之间传递一些信息，如成功或失败，失败原因，缺少数据等。但我不确定哪种方法是正确的。此外，我无法将信息作为参数传递，因为我需要将其检索回来。由于已有返回值，因此无法返回任何值。例如：假设我有这样的类（它只是虚拟代码实际代码非常长）

class A {
   B b = new B();
   C c = new C();
   b.putData();
   c.putData();

   //Want to print all the inforamtion of what happend 
   //in methods of putData and getData. How to do that?
}   

class B {

   boolean putData() {
      D d = new D();
      Data data =d.getData();
      //some code goes here
   }
}
Class C{
   boolean putData() {
      //some code here
   } 
}

Answer 1

查看以下代码是否可以为您提供帮助。

class A {
  B b = new B();
  C c = new C();
  String resultClassB = b.putData();
  String resultClassC = c.putData();

  System.out.println(resultClassB);
  System.out.println(resultClassC)

  //Want to print all the inforamtion of what happend 
 //in methods of putData and getData. How to do that?
}   

class B {

  String putData() {
   D d = new D();
   String data =d.getData();
  //some code goes here

  return data'

 }

}
Class C {
     String putData() {
     //some code here
     String result = "reason for failure and success";
     return result'
   } 
}

class Data (){
    String getData(){
        String data = "get all data to print using some logic";
        return data;
    }
}

Answer 2

您可以使用try {} catch（Exception）{}在出现问题时获取信息。

Succes将是一个有效的返回对象。

 class A {
           B b = new B();
           C c = new C();
           b.putData();
           try
           {
                c.putData();
           }
           catch(Exception e)
           {
               //do error handling, or print stacktrace
           }

          //Want to print all the inforamtion of what happend 
         //in methods of putData and getData. How to do that?
        }   

    class B {

        boolean putData() {
           D d = new D();
           Data data =d.getData();
          //some code goes here
        }
     }
        Class C{
        boolean putData() throws Exception{
            if(<data_missing>) throw new Exception("Data missing");
        } 
 }

如何在对象之间传递数据

2 个答案: