Java 代码格式在遵循 Google Java Style Guide 的基础上，采用 Alibaba 4 个空格缩进的规约（谷歌默认采用的是 2 个空格的缩进）。
IntelliJ IDEA 中导入（Preferences -> Editor -> Code Style -> Java -> Schema -> Import Schema）以下格式文件：
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| <?xml version="1.0" encoding="UTF-8"?>
<code_scheme name="GoogleStyle">
<codeStyleSettings language="JAVA">
<option name="KEEP_CONTROL_STATEMENT_IN_ONE_LINE" value="false"/>
<option name="KEEP_BLANK_LINES_IN_CODE" value="1"/>
<option name="BLANK_LINES_AFTER_CLASS_HEADER" value="1"/>
<option name="ALIGN_MULTILINE_PARAMETERS" value="false"/>
<option name="ALIGN_MULTILINE_RESOURCES" value="false"/>
<option name="ALIGN_MULTILINE_FOR" value="false"/>
<option name="CALL_PARAMETERS_WRAP" value="1"/>
<option name="METHOD_PARAMETERS_WRAP" value="1"/>
<option name="EXTENDS_LIST_WRAP" value="1"/>
<option name="THROWS_KEYWORD_WRAP" value="1"/>
<option name="METHOD_CALL_CHAIN_WRAP" value="1"/>
<option name="BINARY_OPERATION_WRAP" value="1"/>
<option name="BINARY_OPERATION_SIGN_ON_NEXT_LINE" value="true"/>
<option name="TERNARY_OPERATION_WRAP" value="1"/>
<option name="TERNARY_OPERATION_SIGNS_ON_NEXT_LINE" value="true"/>
<option name="FOR_STATEMENT_WRAP" value="1"/>
<option name="ARRAY_INITIALIZER_WRAP" value="1"/>
<option name="WRAP_COMMENTS" value="true"/>
<option name="IF_BRACE_FORCE" value="3"/>
<option name="DOWHILE_BRACE_FORCE" value="3"/>
<option name="WHILE_BRACE_FORCE" value="3"/>
<option name="FOR_BRACE_FORCE" value="3"/>
<option name="PARENT_SETTINGS_INSTALLED" value="true"/>
<indentOptions>
<option name="INDENT_SIZE" value="4"/>
<option name="CONTINUATION_INDENT_SIZE" value="4"/>
<option name="TAB_SIZE" value="4"/>
</indentOptions>
</codeStyleSettings>
</code_scheme>
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