testbreakiterator.java

本书是一本为Java学习者在基础内容学习结束后进行课程设计时提供参考的指导书

package apibook.c2.s2;

import java.text.*;
import java.util.*;

//测试BreakIterator类
public class TestBreakIterator {
  public TestBreakIterator() {
  }
//按顺序输出每个元素
  public static void printEachForward(BreakIterator boundary, String source) {
      int start = boundary.first();
      for (int end = boundary.next();
           end != BreakIterator.DONE;
           start = end, end = boundary.next()) {
           System.out.println(source.substring(start,end));
      }
  }
  //按反序输出每个元素
  public static void printEachBackward(BreakIterator boundary, String source) {
      int end = boundary.last();
      for (int start = boundary.previous();
           start != BreakIterator.DONE;
           end = start, start = boundary.previous()) {
          System.out.println(source.substring(start,end));
      }
  }
  //输出第一个元素
  public static void printFirst(BreakIterator boundary, String source) {
      int start = boundary.first();
      int end = boundary.next();
      System.out.println("Start:" + source.substring(start,end));
  }
  //输出最后一个元素
  public static void printLast(BreakIterator boundary, String source) {
      int end = boundary.last();
      int start = boundary.previous();
      System.out.println("Last:" + source.substring(start,end));
  }
  //输出特定位置的元素
  public static void printAt(BreakIterator boundary, int pos, String source) {
      int end = boundary.following(pos);
      int start = boundary.previous();
      System.out.println(source.substring(start,end));
  }
  //输出下一个元素
  public static int nextWordStartAfter(int pos, String text) {
      BreakIterator wb = BreakIterator.getWordInstance();
      wb.setText(text);
      int last = wb.following(pos);
      int current = wb.next();
      while (current != BreakIterator.DONE) {
          for (int p = last; p < current; p++) {
              if (Character.isLetter(text.charAt(p)))
                  return last;
          }
          last = current;
          current = wb.next();
      }
      return BreakIterator.DONE;
  }


  public static void main(String[] args) {
      String stringToExamine = "test?yes,test BreakIterator!oh!";
      //按顺序输出每个单词
      BreakIterator boundary = BreakIterator.getWordInstance();
      boundary.setText(stringToExamine);
      printEachForward(boundary, stringToExamine);
      //反序输出每个句子
      boundary = BreakIterator.getSentenceInstance(Locale.US);
      boundary.setText(stringToExamine);
      printEachBackward(boundary, stringToExamine);
      //输出第一个
      printFirst(boundary, stringToExamine);
      //输出最后一个
      printLast(boundary, stringToExamine);
  }

}