Java 如何使用子字符串方法打断这4个单词

我想把一个由4个单词组成的句子分成几个单词。但是，我不知道如何告诉它在句子的第一个空格后开始，然后停止，然后是下一个空格

import java.util.Scanner;
public class arithmetic {
    public static void main(String[] args) {
    Scanner in = new Scanner(System.in)

    String sentence;
    String word1, word2, word3, word4;
    int p, p2;

    System.out.print("Enter a sentence with 4 words:");
    sentence = in.nextLine();

    p = sentence.indexOf(" ");

    word1 = sentence.substring(0,p)+(" ");
    word2 = sentence.substring()(" ");
    word3 = sentence.substring()+(" ");
    word4 = sentence.substring()+(" ");

    sentence = word1+word2+word3+word4;

    System.out.println(sentence);

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这听起来像是你的工作

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现在，Word中包含了一个字符串数组，您可以对它们执行任何操作，如将它们转换为另一个句子。

您还可以使用

String.split（）

方法，如下所示：

import java.util.Scanner;
public class arithmetic {
    public static void main(String[] args) {
    Scanner in = new Scanner(System.in)

    String sentence;
    String word1, word2, word3, word4;
    int p, p2;

    System.out.print("Enter a sentence with 4 words:");
    sentence = in.nextLine();

    p = sentence.indexOf(" ");

    word1 = sentence.substring(0,p)+(" ");
    word2 = sentence.substring()(" ");
    word3 = sentence.substring()+(" ");
    word4 = sentence.substring()+(" ");

    sentence = word1+word2+word3+word4;

    System.out.println(sentence);

String[] parts = sentence.split("\\s");

这与Chris方法得出的结果完全相同