Java中的 BreakIterator isBoundary() 方法及示例

在Java中，BreakIterator是用于将文本分割成单独单词、句子或其他特定单元的类。BreakIterator的isBoundary()方法可以用于判断指定位置是否是边界，即是否可以将其作为分割点来分割文本。

BreakIterator isBoundary()方法的语法

BreakIterator的isBoundary()方法的语法如下：

public boolean isBoundary(int offset)

其中，offset参数表示要判断的位置。如果该位置是边界，则返回true，否则返回false。

BreakIterator isBoundary()方法的示例

以下示例演示了如何使用BreakIterator的isBoundary()方法来查找文本中的边界。

import java.text.BreakIterator;

public class BreakIteratorExample {

    public static void main(String[] args) {
        String text = "This is a simple sentence. It contains multiple sentences. " +
                      "Some of the sentences may have different endings, such " +
                      "as a question mark or an exclamation point.";

        // 获取句子边界
        BreakIterator sentenceIterator = BreakIterator.getSentenceInstance();
        sentenceIterator.setText(text);

        // 遍历句子边界并输出
        int start = sentenceIterator.first();
        int end = sentenceIterator.next();
        while (end != BreakIterator.DONE) {
            System.out.println("Sentence: " + text.substring(start, end) +
                    ", Start index: " + start + ", End index: " + end);

            // 如果当前位置是边界，则输出
            if (sentenceIterator.isBoundary(end)) {
                System.out.println("End index is a boundary");
            }

            start = end;
            end = sentenceIterator.next();
        }
    }
}

运行该示例，将会输出每个句子及其起始和结束索引。如果结束索引是边界，则会在句子后面输出“End index is a boundary”。

输出结果如下所示：

Sentence: This is a simple sentence., Start index: 0, End index: 25
End index is a boundary
Sentence:  It contains multiple sentences., Start index: 27, End index: 61
End index is a boundary
Sentence:  Some of the sentences may have different endings, such as a question mark or an exclamation point., Start index: 63, End index: 122
End index is a boundary