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Compilercompliancelevel设置为 1.4，取消选择 “Usedefault compliancesettings”，并将 “Generated .class filescompatibility”和 “Source compatibility” 设为 1.4。

youdao

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Compilercompliancelevel设置为 1.4，取消选择 “Usedefault compliancesettings”，并将 “Generated .class filescompatibility”和 “Source compatibility” 设为 1.4。

youdao