如何判断一个Socket对象当前是否处于连接状态?
A.
boolean isConnected=socket.isConnected() && socket.isBound();
B.
boolean isConnected=socket.isConnected() && !socket.isClosed();
C.
boolean isConnected=socket.isConnected() && !socket.isBound();
D.
boolean isConnected=socket.isConnected();