java - 在x个单词之后分割字符串

Question

我有一个总是在变化的字符串，就像一个随机语句。我想要做的是在 10 个单词之后我想分割字符串，这样当我打印它时它是 2 行。

例如:

String s = "A random statement about anything can go here and it won't change anything."

然后我希望每十个单词就分割一次，所以在“it”之后它会被分割，然后它看起来像这样:

String[] arrayOfString;
System.out.println(arrayOfString[0]); -> which prints "A random statement about anything can go here and it"
System.out.println(arrayOfString[1]); -> which prints "won't change anything."

对此的任何帮助都会很棒，谢谢!

Answer 1

只是为了给你另一个解决方案。我认为这更容易阅读，因为它无需对数组进行索引操作即可工作:

package stack;

import java.util.StringTokenizer;

 /**
 * This class can Split texts.
 */
 public class Splitter
 {

 public static final String WHITESPACE = " ";
 public static final String LINEBREAK = System.getProperty("line.separator");

 /**
  * Insert line-breaks into the text so that each line has maximum number of words.
  *
  * @param text         the text to insert line-breaks into
  * @param wordsPerLine maximum number of words per line
  * @return a new text with linebreaks
  */
  String splitString(String text, int wordsPerLine)
  {
    final StringBuilder newText = new StringBuilder();

    final StringTokenizer wordTokenizer = new StringTokenizer(text);
    long wordCount = 1;
    while (wordTokenizer.hasMoreTokens())
    {
        newText.append(wordTokenizer.nextToken());
        if (wordTokenizer.hasMoreTokens())
        {
            if (wordCount++ % wordsPerLine == 0)
            {
                newText.append(LINEBREAK);
            }
            else
            {
                newText.append(WHITESPACE);
            }
        }
    }
    return newText.toString();
   }
}

以及相应的 JUnit-Test，它使用 AssertJ-Library:

package stack;

import static org.assertj.core.api.Assertions.assertThat;

import org.junit.Test;

public class SplitterTest
{
 private final Splitter sut = new Splitter();

@Test
public void splitDemoTextAfter10Words() throws Exception
{
    final String actual = sut.splitString(
        "A random statement about anything can go here and it won't change anything.", 10);

    assertThat(actual).isEqualTo("A random statement about anything can go here and it\r\n"
                                 + "won't change anything.");
}

@Test
public void splitNumerText() throws Exception
{

    final String actual = sut.splitString("1 2 3 4 5 6 7 8 9 10 11 12", 4);

    assertThat(actual).isEqualTo("1 2 3 4\r\n5 6 7 8\r\n9 10 11 12");
  }
}