stringutils.isempty()

StringUtils.isEmpty()是一个常用的方法，用于判断字符串是否为空。根据引用和引用的源码，当传入的字符串为null或者字符串长度为0时，该方法会返回true，表示字符串为空值。因此，在你提供的代码中，当字符串str为空时，if(StringUtils.isEmpty(str))这个条件成立，会输出"这个字符串为空！"。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* *2* *3* [【Java】StringUtils的isEmpty()和isBlank()方法的使用和区别解析](https://blog.csdn.net/Dan1374219106/article/details/108734347)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT3_1"}}] [.reference_item style="max-width: 100%"]
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相关问题

StringUtils.isEmpty

StringUtils.isEmpty is a method in the Apache Commons Lang library that checks whether a given string is empty or null. The method returns true if the string is null or has zero length, otherwise it returns false.

For example, consider the following code snippet:

String str1 = "";
String str2 = null;
String str3 = "Hello World";

boolean isEmpty1 = StringUtils.isEmpty(str1); // true
boolean isEmpty2 = StringUtils.isEmpty(str2); // true
boolean isEmpty3 = StringUtils.isEmpty(str3); // false

In this example, StringUtils.isEmpty returns true for str1 and str2, which are empty or null, and false for str3, which contains a non-empty string. By using this method, we can easily check whether a string is empty or null before performing any operations on it.

StringUtils.isempty

StringUtils.isEmpty方法是一个用于判断字符串是否为空的方法。根据引用和引用的代码示例，可以看出isEmpty方法的实现是通过判断字符序列是否为null或长度是否为0来确定字符串是否为空。如果字符串为null或长度为0，则返回true，否则返回false。这个方法没有忽略空格，而是以是否为空和是否存在为判断依据。所以如果字符串中只包含空格，它依然会被判断为非空。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* *2* *3* [关于StringUtils里isEmpty方法和isBlank方法](https://blog.csdn.net/qq_55894557/article/details/124568346)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 100%"]
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