isblank 和 isempty
时间: 2024-05-16 22:18:49 浏览: 73
isBlank()和isEmpty()是Java中String类的两个方法,用于判断一个字符串是否为空。它们之间的主要区别在于isBlank()方法会将只包含空格的字符串也视为空,而isEmpty()方法只会将空字符串视为空。举例来说,对于isBlank()方法,"".isBlank()的结果是true," ".isBlank()的结果也是true,而"hi".isBlank()的结果是false," hi "的结果也是false。而对于isEmpty()方法,"".isEmpty()的结果是true," ".isEmpty()的结果是false,"hi".isEmpty()的结果是false," hi "的结果也是false。
isBlank()方法是在isEmpty()方法的基础上进行了更加严格的判断,即当字符串只包含空格、制表符、tab时也会被视为空。因此,在实际使用中,如果需要判断字符串是否为空,一般更常用isBlank()方法。
isEmpty()方法的实现是通过判断字符串是否为null或长度是否为0来确定字符串是否为空。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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