卸载掉open jdk，重新安装sun1.7jdk，查看后提示：

[root@localhost java]# java --version

Unrecognized option: --version
Error: Could not create the Java Virtual Machine.

Error: A fatal exception has occurred. Program will exit.

是命令不同造成，1.7查看命令为

[root@localhost java]# java -version
java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)