java - 尝试用空格分割字符串

Question

我正在编写一段代码，尝试通过使用用户输入的值之间的空格将用户的输入分成 3 个不同的数组。但是，每次我运行代码时都会收到错误:

    Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1
            at Substring.main(Substring.java:18)
    Java Result: 1

我在输入文本时尝试使用不同的分隔符，效果很好，例如通常使用/拆分完全相同的输入，并执行到目前为止我希望它执行的操作。任何帮助，将不胜感激!如果需要的话这是我的代码

import java.util.Scanner;

    public class Substring{
    public static void main(String[]args){
    Scanner user_input = new Scanner(System.in);

    String fullname = ""; //declaring a variable so the user can enter their full name
    String[] NameSplit = new String[2];
    String FirstName;
    String MiddleName;
    String LastName;

    System.out.println("Enter your full name (First Middle Last): ");
    fullname = user_input.next(); //saving the user's name in the string fullname

    NameSplit = fullname.split(" ");//We are splitting up the value of fullname every time there is a space between words
    FirstName = NameSplit[0]; //Putting the values that are in the array into seperate string values, so they are easier to handle
    MiddleName = NameSplit[1];
    LastName = NameSplit[2];

    System.out.println(fullname); //outputting the user's orginal input
    System.out.println(LastName+ ", "+ FirstName +" "+ MiddleName);//outputting the last name first, then the first name, then the middle name
    new StringBuilder(FirstName).reverse().toString();
    System.out.println(FirstName);


}

}

Answer 1

Split 是一种正则表达式，您可以查找一个或多个空格(“+”)，而不仅仅是一个空格(“”)。

String[] array = s.split(" +");

或者您可以使用 Strint Tokenizer

 String message = "MY name is ";
 String delim = " \n\r\t,.;"; //insert here all delimitators
 StringTokenizer st = new StringTokenizer(message,delim);
 while (st.hasMoreTokens()) {
     System.out.println(st.nextToken());
 }