publicclassStringUtils{publicstaticbooleanisNotEmptyOrWhitespace(Stringstr){returnstr!=null&&!str.trim().isEmpty();}publicstaticvoidmain(String[]args){StringtestStr1=" ";StringtestStr2="Hello, World!";StringtestStr3=null;System.out.println(isNotEmptyOrWhitespace(testStr1));// falseSystem.out....
Example 1: Check if String is Empty or Null class Main { public static void main(String[] args) { // create null, empty, and regular strings String str1 = null; String str2 = ""; String str3 = " "; // check if str1 is null or empty System.out.println("str1 is " + is...
Learn how to effectively check if a Java string is null, empty, and whitespace. Enhance code reliability and prevent errors. Master string validation in Java now!
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public static String abbr2(String param, int length) { if (param == null) { return ""; } StringBuffer result = new StringBuffer(); int n = 0; char temp; boolean isCode = false; // 是不是HTML代码 boolean isHTML = false; // 是不是HTML特殊字符,如 for (int i = 0; i < ...
is null, empty or whitespace* @since 2.0* @since 3.0 Changed signature from isBlank(String) ...
IndexOutOfBoundsException - If offset is negative, count is negative, or offset is greater than ascii.length - count See Also: String(byte[], int), String(byte[], int, int, java.lang.String), String(byte[], int, int, java.nio.charset.Charset), String(byte[], int, int), String(...
函数StringUtils.isNotBlank(testString)的功能与StringUtils.isBlank(testString)相反. 2.清除空白字符 使用函数: StringUtils.trimToNull(testString) 函数介绍:清除掉testString首尾的空白字符,如果仅testString全由空白字符 (whitespace)组成则返回null 例程: ...
翻一下JDK的实现就会知道：其实isEmpty完全等同于string.length()==0如果String本身是null，那么使用...
public static void main(String[] args) { 挖到(); System.out.println(Character.isJavaIdentifierPart(97)); System.out.println("代码点值是: "+(int)'_'); } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15.