testchoiceformat.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.*;

//测试ChoiceFormat类
public class TestChoiceFormat {
  public TestChoiceFormat() {
  }
  public static void main(String[] args) {
      double[] limits = {1,2,3,4,5,6,7};
      String[] monthNames = {"Sun","Mon","Tue","Wed","Thur","Fri","Sat"};
      //构造ChoiceFormat对象
      ChoiceFormat form = new ChoiceFormat(limits, monthNames);
      ParsePosition status = new ParsePosition(0);
      for (double i = 0.0; i <= 8.0; ++i) {
          status.setIndex(0);
          //格式化和分析
          System.out.println(i + " -> " + form.format(i) + " -> "
                                   + form.parse(form.format(i),status));
      }

      double[] filelimits = {0,1,2};
      String[] filepart = {"are no files","is one file","are {2} files"};
      //构造ChoiceFormat对象
      ChoiceFormat fileform = new ChoiceFormat(filelimits, filepart);
      Format[] testFormats = {fileform, null, NumberFormat.getInstance()};
      MessageFormat pattform = new MessageFormat("There {0} on {1}");
      pattform.setFormats(testFormats);
      Object[] testArgs = {null, "ADisk", null};
      for (int i = 0; i < 4; ++i) {
          testArgs[0] = new Integer(i);
          testArgs[2] = testArgs[0];
          System.out.println(pattform.format(testArgs));
      }

      //使用模式直接指定格式对应构造ChoiceFormat对象
      ChoiceFormat fmt = new ChoiceFormat(
           "-1#is negative| 0#is zero or fraction | 1#is one |1.0<is 1+ |2#is two |2<is more than 2.");
      System.out.println("Formatter Pattern : " + fmt.toPattern());//输出模式串
     //格式化
      System.out.println("Format with -INF : " + fmt.format(Double.NEGATIVE_INFINITY));
      System.out.println("Format with -1.0 : " + fmt.format(-1.0));
      System.out.println("Format with 0 : " + fmt.format(0));
      System.out.println("Format with 0.9 : " + fmt.format(0.9));
      System.out.println("Format with 1.0 : " + fmt.format(1));
      System.out.println("Format with 1.5 : " + fmt.format(1.5));
      System.out.println("Format with 2 : " + fmt.format(2));
      System.out.println("Format with 2.1 : " + fmt.format(2.1));
      System.out.println("Format with NaN : " + fmt.format(Double.NaN));
      System.out.println("Format with +INF : " + fmt.format(Double.POSITIVE_INFINITY));
  }

}