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 “Usedefault compliancesettings”，并将 “Generated .class filescompatibility”和 “Source compatibility” 设为 1.4。

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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 “Usedefault compliancesettings”，并将 “Generated .class filescompatibility”和 “Source compatibility” 设为 1.4。

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