Change the Compiler compliance level field value to 1.4 as shown in figure 3.

将Compiler compliance level字段的值修改为1.4，如图3所示。

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Set the Compiler compliance level to 1.4, deselect "Use default compliance settings," and set "Generated .class files compatibility" and "Source compatibility" to 1.4.

将 Compiler compliance level 设置为 1.4，取消选择 “Use default compliance settings”，并将 “Generated .class files compatibility” 和 “Source compatibility” 设为 1.4。

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