a.java

importjava.net.Socket;  
importjava.io.IOException;  
importjava.io.InputStreamReader;  
importjava.io.BufferedReader;  
importjava.io.PrintWriter;  
publicclassClientTest{  
privateSocketsocket;  
BufferedReaderin;  
PrintWriterout;  
publicClientTest(){  
try{  
System.out.println("Trytoconnectto127.0.0.1:10000");  
socket=newSocket("127.0.0.1",10000);  
System.out.println("TheServerConnected!");  
System.out.println("Pleaseentersomecharacters:");  
BufferedReaderline=newBufferedReader(newInputStreamReader(System.in));  
out=newPrintWriter(socket.getOutputStream(),true);  
out.println(line.readLine());  
in=newBufferedReader(newInputStreamReader(socket.getInputStream()));  
System.out.println(in.readLine());  
out.close();  
in.close();  
socket.close();  
}catch(IOExceptionex){  
System.out.println(ex.getMessage());  
}  
}  
publicstaticvoidmain(String[]args){  
newClientTest();  
}  
}