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有接口程序
package my_program;
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;
}
另外一个程序为
package my_program;
import java.rmi.server.UnicastRemoteObject;
public class CalculatorImpl extends UnicastRemoteObject implements Calculator {
// 这个实现必须有一个显式的构造函数,并且要抛出一个RemoteException异常
public CalculatorImpl() throws java.rmi.RemoteException {
super();
}
public long add(long a, long b) throws java.rmi.RemoteException {
return a + b;
}
public long sub(long a, long b) throws java.rmi.RemoteException {
return a - b;
}
public long mul(long a, long b) throws java.rmi.RemoteException {
return a * b;
}
public long div(long a, long b) throws java.rmi.RemoteException {
return a / b;
}
}
当编译第二个程序的时候报
CalculatorImpl.java:14: cannot resolve symbol
symbol : class Calculator
location: class my_program.CalculatorImpl
public class CalculatorImpl implements Calculator {
^
1 error
这到底是何原因?? |
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