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...
publicclassStringCheckExample{ publicstaticvoidmain(String[] args){ // 定义一个可能为null或空的String变量 StringmyString=null;// 我们可以根据需要更改这个变量的值 // 判断String是否为null或空 if(myString ==null|| myString.isEmpty) { System.out.println("The string is null or empty."); }el...
string input string error } EMPTY_STRING_CHECK { if (input.isEmpty) error --> "IllegalArgumentException" } USER ||--|{ EMPTY_STRING_CHECK : "inputs" 总结 通过以上步骤,我们成功地实现了一个简单的 Java 程序,该程序能够检查用户输入的字符串是否为空,并处理相应的错误信息。希望这篇指导能够帮助...
Check if String is Null or Empty in Java Java: Check if String is Numeric How to Convert String to int in Java Reverse a String in Java Convert int to String in Java How to Split a String in Java: Different Examples Convert Char to String in Java ...
Check if a String is Null, Empty or Blank in Java Java: Check if String is Numeric How to Convert String to int in Java Reverse a String in Java Convert int to String in Java How to Split a String in Java: Different Examples
publicclassEmptyStringExample{publicstaticvoidmain(String[]args){Stringstr="";// 空字符串// 判断字符串是否为空字符串if(str.equals("")){System.out.println("字符串是空字符串");}else{System.out.println("字符串不是空字符串");}str="Hello";// 判断字符串是否为空字符串if(str.isEmpty()){...
publicclassStringCheckExample{publicstaticvoidmain(String[] args){// 定义一个可能为null或空的String变量StringmyString=null;// 我们可以根据需要更改这个变量的值// 判断String是否为null或空if(myString ==null|| myString.isEmpty()) { System.out.println("The string is null or empty."); ...
c) If aXbZc is true, aXbYZca is also valid, where a, b, c are either empty strings or a string consisting only of the letter X. Visual Presentation: Sample Solution: Java Code: // Importing necessary classesimportjava.util.PriorityQueue;importjava.util.Scanner;// Defining a class named ...
2. StringisBlank()Example Java program to check if a given string is blank or not. "ABC".isBlank() //false " ABC ".isBlank() //false " ".isBlank() //true "".isBlank() ) //true 3. Difference betweenisBlank()andisEmpty()
其实isEmpty完全等同于string.length()==0 如果String本身是null，那么使用string.isEmpty()会报空指针...