strsortvector.java

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//: StrSortVector.java
// Automatically sorted Vector that 
// accepts and produces only Strings
//测试
import java.util.*;

public class StrSortVector {
  private SortVector v = new SortVector(
    // Anonymous inner class:
    new Compare() {
      public boolean 
      lessThan(Object l, Object r) {
        return 
          ((String)l).toLowerCase().compareTo(
          ((String)r).toLowerCase()) < 0;
      }
      public boolean 
      lessThanOrEqual(Object l, Object r) {
        return 
          ((String)l).toLowerCase().compareTo(
          ((String)r).toLowerCase()) <= 0;
      }
    }
  );
  private boolean sorted = false;
  public void addElement(String s) {
    v.addElement(s);
    sorted = false;
  }
  public String elementAt(int index) {
    if(!sorted) {
      v.sort();
      sorted = true;
    }
    return (String)v.elementAt(index);
  }
  public Enumeration elements() {
    if(!sorted) {
      v.sort();
      sorted = true;
    }
    return v.elements();
  }
  // Test it:
  public static void main(String[] args) {
    StrSortVector sv = new StrSortVector();
    sv.addElement("d");
    sv.addElement("A");
    sv.addElement("C");
    sv.addElement("c");
    sv.addElement("b");
    sv.addElement("B");
    sv.addElement("D");
    sv.addElement("a");
    Enumeration e = sv.elements();
    while(e.hasMoreElements())
      System.out.println(e.nextElement());
  }
} ///:~