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Hutool是一个小而全的Java工具类库,通过静态方法封装,降低相关API的学习成本,提高工作效率,使Java拥有函数式语言般的优雅,让Java语言也可以“甜甜的”。

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package cn.hutool.json;

import cn.hutool.core.util.StrUtil;

import java.io.Serializable;

/**
 * 用于定义{@code null},与Javascript中null相对应
* Java中的{@code null}值在js中表示为undefined。 * * @author Looly */ public class JSONNull implements Serializable { private static final long serialVersionUID = 2633815155870764938L; /** * {@code NULL} 对象用于减少歧义来表示Java 中的{@code null}
* {@code NULL.equals(null)} 返回 {@code true}.
* {@code NULL.toString()} 返回 {@code "null"}. */ public static final JSONNull NULL = new JSONNull(); /** * A Null object is equal to the null value and to itself. * 对象与其本身和{@code null}值相等 * * @param object An object to test for nullness. * @return true if the object parameter is the JSONObject.NULL object or null. */ @SuppressWarnings("EqualsWhichDoesntCheckParameterClass") @Override public boolean equals(Object object) { return object == null || (object == this); } /** * Get the "null" string value. * 获得“null”字符串 * * @return The string "null". */ @Override public String toString() { return StrUtil.NULL; } }




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