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client.java

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+//CLIENT
+import java.rmi.*;
+public class client{
+	public static void main(String[] args){
+		try{
+			operation opt = (operation)Naming.lookup("rmi://localhost:6007/methods");
+			System.out.println(opt.getMessage());
+			System.out.println(opt.add(10, 20));
+			System.out.println(opt.subtract(10, 20));
+			System.out.println(opt.multiply(10, 20));
+			System.out.println(opt.divide(10, 20));
+		}
+		catch(Exception e){
+		}
+	}
+}

operation.java

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+//INTERFACE
+import java.rmi.*;
+public interface operation extends Remote{
+	public String getMessage() throws Exception;
+	public int add(int a, int b) throws Exception;
+	public int subtract(int a, int b) throws Exception;
+	public int multiply(int a,int b) throws Exception;
+	public int divide(int a, int b) throws Exception;
+}

operation_impl.java

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+//INTERFACE IMPLEMENTATION
+import java.rmi.server.*;
+import java.rmi.*;
+public class operation_impl extends UnicastRemoteObject implements operation{
+	public operation_impl() throws Exception{
+		super();
+	}
+	public String getMessage() throws Exception{
+		return "Welcome to RMI Implementation";
+	}
+	public int add(int a, int b) throws Exception{
+		return a + b;
+	}
+	public int subtract(int a, int b) throws Exception{
+		return a - b;
+	}
+	public int multiply(int a,int b) throws Exception{
+		return a * b;
+	}
+	public int divide(int a, int b) throws Exception{
+		return a / b;
+	}	
+}

server.java

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+//SERVER 
+import java.rmi.*;
+import java.rmi.registry.LocateRegistry;
+import java.rmi.registry.Registry;
+public class server{
+	public static void main(String args[]){
+		try{
+			Registry registry = LocateRegistry.createRegistry(6007);
+			operation_impl obj1 = new operation_impl();
+			registry.rebind("methods", obj1);
+			System.out.println("Server Ready!!");
+		}
+		catch(Exception e){
+		}
+	}
+}
+