2021-12-07 1.更新demo

JLChen

2021-12-07 fc4e5c770f076e98e890cffc9e2976754c3607da

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<?xml version="1.0" encoding="UTF-8"?> 
<project version="4"> 
  <component name="CompilerConfiguration"> 
    <bytecodeTargetLevel target="1.8" /> 
  </component> 
</project>