英文写作网站,清新区住房和城乡建设局网站,智慧团建团员登录网站,如何去做电商平台isEmpty 和 isBlank 的用法区别 isEmpty系列isBank系列 hi#xff01;我是沁禹#xff5e; 也许你两个都不知道,也许你除了isEmpty/isNotEmpty/isNotBlank/isBlank外,并不知道还有isAnyEmpty/isNoneEmpty/isAnyBlank/isNoneBlank的存在, come on ,让我们一起来探索org.apache… isEmpty 和 isBlank 的用法区别 isEmpty系列isBank系列 hi我是沁禹 也许你两个都不知道,也许你除了isEmpty/isNotEmpty/isNotBlank/isBlank外,并不知道还有isAnyEmpty/isNoneEmpty/isAnyBlank/isNoneBlank的存在, come on ,让我们一起来探索org.apache.commons.lang3.StringUtils;这个工具类.
isEmpty系列
StringUtils.isEmpty()
是否为空. 可以看到 空格是会绕过这种空判断,因为是一个空格,并不是严格的空值,会导致 isEmpty( )false
StringUtils.isEmpty(null) trueStringUtils.isEmpty(“”) trueStringUtils.isEmpty( ) falseStringUtils.isEmpty(“bob”) falseStringUtils.isEmpty( bob ) false /**** pNOTE: This method changed in Lang version 2.0.* It no longer trims the CharSequence.* That functionality is available in isBlank()./p** param cs the CharSequence to check, may be null* return {code true} if the CharSequence is empty or null* since 3.0 Changed signature from isEmpty(String) to isEmpty(CharSequence)*/public static boolean isEmpty(final CharSequence cs) {return cs null || cs.length() 0;}StringUtils.isNotEmpty()
相当于不为空 , !isEmpty()
public static boolean isNotEmpty(final CharSequence cs) {return !isEmpty(cs);}StringUtils.isAnyEmpty()
是否有一个为空,只有一个为空,就为true.
StringUtils.isAnyEmpty(null) trueStringUtils.isAnyEmpty(null, “foo”) trueStringUtils.isAnyEmpty(“”, “bar”) trueStringUtils.isAnyEmpty(“bob”, “”) trueStringUtils.isAnyEmpty( bob , null) trueStringUtils.isAnyEmpty( , “bar”) falseStringUtils.isAnyEmpty(“foo”, “bar”) false
/*** param css the CharSequences to check, may be null or empty* return {code true} if any of the CharSequences are empty or null* since 3.2*/public static boolean isAnyEmpty(final CharSequence... css) {if (ArrayUtils.isEmpty(css)) {return true;}for (final CharSequence cs : css){if (isEmpty(cs)) {return true;}}return false;}StringUtils.isNoneEmpty()
相当于!isAnyEmpty(css) , 必须所有的值都不为空才返回true
/*** pChecks if none of the CharSequences are empty () or null./p* pre* StringUtils.isNoneEmpty(null) false* StringUtils.isNoneEmpty(null, foo) false* StringUtils.isNoneEmpty(, bar) false* StringUtils.isNoneEmpty(bob, ) false* StringUtils.isNoneEmpty( bob , null) false* StringUtils.isNoneEmpty( , bar) true* StringUtils.isNoneEmpty(foo, bar) true* /pre* param css the CharSequences to check, may be null or empty* return {code true} if none of the CharSequences are empty or null* since 3.2*/
public static boolean isNoneEmpty(final CharSequence... css) {return !isAnyEmpty(css);
}isBank系列
StringUtils.isBlank()
是否为真空值(空格或者空值)
StringUtils.isBlank(null) trueStringUtils.isBlank(“”) trueStringUtils.isBlank( ) trueStringUtils.isBlank(“bob”) falseStringUtils.isBlank( bob ) false
/*** pChecks if a CharSequence is whitespace, empty () or null./p* param cs the CharSequence to check, may be null* return {code true} if the CharSequence is null, empty or whitespace* since 2.0* since 3.0 Changed signature from isBlank(String) to isBlank(CharSequence)*/
public static boolean isBlank(final CharSequence cs) {int strLen;if (cs null || (strLen cs.length()) 0) {return true;}for (int i 0; i strLen; i) {if (Character.isWhitespace(cs.charAt(i)) false) {return false;}}return true;
}StringUtils.isNotBlank()
是否真的不为空,不是空格或者空值 ,相当于!isBlank();
public static boolean isNotBlank(final CharSequence cs) {return !isBlank(cs);}StringUtils.isAnyBlank()
是否包含任何真空值(包含空格或空值)
StringUtils.isAnyBlank(null) trueStringUtils.isAnyBlank(null, “foo”) trueStringUtils.isAnyBlank(null, null) trueStringUtils.isAnyBlank(“”, “bar”) trueStringUtils.isAnyBlank(“bob”, “”) trueStringUtils.isAnyBlank( bob , null) trueStringUtils.isAnyBlank( , “bar”) trueStringUtils.isAnyBlank(“foo”, “bar”) false /*** pChecks if any one of the CharSequences are blank () or null and not whitespace only../p* param css the CharSequences to check, may be null or empty* return {code true} if any of the CharSequences are blank or null or whitespace only* since 3.2*/
public static boolean isAnyBlank(final CharSequence... css) {if (ArrayUtils.isEmpty(css)) {return true;}for (final CharSequence cs : css){if (isBlank(cs)) {return true;}}return false;
}StringUtils.isNoneBlank()
是否全部都不包含空值或空格
StringUtils.isNoneBlank(null) falseStringUtils.isNoneBlank(null, “foo”) falseStringUtils.isNoneBlank(null, null) falseStringUtils.isNoneBlank(“”, “bar”) falseStringUtils.isNoneBlank(“bob”, “”) falseStringUtils.isNoneBlank( bob , null) falseStringUtils.isNoneBlank( , “bar”) falseStringUtils.isNoneBlank(“foo”, “bar”) true
/*** pChecks if none of the CharSequences are blank () or null and whitespace only../p* param css the CharSequences to check, may be null or empty* return {code true} if none of the CharSequences are blank or null or whitespace only* since 3.2*/
public static boolean isNoneBlank(final CharSequence... css) {return !isAnyBlank(css);
}StringUtils的其他方法
可以参考官方的文档,里面有详细的描述,有些方法还是很好用的. StringUtils: 官方文档 好了到这我们的教程也结束了 希望以上方法可以帮到您祝您工作愉快 对您有帮助的话记点赞得收藏哦 我是 沁禹 一个在互联网摸爬滚打的工具人
