fix code

hutool-socket/src/main/java/cn/hutool/socket/aio/AioServer.java

@@ -143,7 +143,7 @@ public class AioServer implements Closeable{
 	 * @return 服务是否开启状态
 	 */
 	public boolean isOpen() {
-		return (null == this.channel) ? false : this.channel.isOpen();
+		return (null != this.channel) && this.channel.isOpen();
 	}
 
 	/**

hutool-socket/src/main/java/cn/hutool/socket/aio/AioSession.java

@@ -153,7 +153,7 @@ public class AioSession implements Closeable{
 	 * @return 会话是否打开状态
 	 */
 	public boolean isOpen() {
-		return (null == this.channel) ? false : this.channel.isOpen();
+		return (null != this.channel) && this.channel.isOpen();
 	}
 
 	/**

hutool-socket/src/main/java/cn/hutool/socket/nio/Operation.java

@@ -29,7 +29,7 @@ public enum Operation {
 	 * @see SelectionKey#OP_CONNECT
 	 * @see SelectionKey#OP_ACCEPT
 	 */
-	private Operation(int value) {
+	Operation(int value) {
 		this.value = value;
 	}