calculator.java

JAVA讲解课件

//Calculator.java
//define the interface
import java.rmi.Remote;

public interface Calculator extends Remote
{
    public long add(long a, long b) 
        throws java.rmi.RemoteException; 

    public long sub(long a, long b) 
        throws java.rmi.RemoteException; 

    public long mul(long a, long b) 
        throws java.rmi.RemoteException; 

    public long div(long a, long b) 
        throws java.rmi.RemoteException; 
} 


//这个接口继承自Remote，每一个定义的方法都必须抛出一个RemoteException异常对象。
//在Java RMI中，能通过实现Remote和抛出RemoteExceptions来区分远程对象。