因为您需要输入Java Preferences窗格并以这种方式仅标记JVM 7：

Because you need to enter in Java Preferences pane and flag only the JVM 7 in this way :

轻松快速地打开在Mac OS X中的 Java首选项窗格中，您只需使用⌘ + SPACE 调用聚光灯并输入系统偏好设置它将显示在窗口的最后一行。

To easily and quickly open the Java Preferences pane in Mac OS X you can simply call spotlight with ⌘+SPACE and type System Preferences it will show up in the last row of the window.