java - Java中同一个套接字上的两个不同对象

Question

发件人:

ObjectA A = new ObjectA();
ObjectB B = new ObjectB();
//Connection is created
socket.writeObject(B);

接收者:

//不知道如何找到我应该将对象类型转换为哪个对象:(

有没有办法在同一个对象流上发送两个不同的对象？

-Pk

Answer 1

使用instanceof

A a = new A();
B b = new B();
C c = new C();
 //say obj is the object you read from your socket.
if(a instanceof A){
      System.out.println("a is instance of A, obj can be cast as A");
      A remoteA = (A)obj; //wont throw classcast exception!!
}
if(b instanceof B){
      System.out.println("b is instance of B, obj can be cast as B");
      B remoteB = (B)obj; //wont throw classcast exception!!
}
if(c instanceof C){
      System.out.println("c is instance of C,obj can be cast as C"); 
      C remoteC = (C)obj;  //wont throw classcast exception!!
}

这两个对象是否相关？一个继承另一个？如果是这样，您需要明确检查。

说A(父类)-> B

B b =  new B()

因此 b instanceof B 和 b instanceof A 将为真。所以你需要小心。先检查子类。