compdemo.java~1~

来自「java2参考大全上的例子的源码和自己的理解.」· JAVA~1~ 代码 · 共 55 行

package 比较函数;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

// Use a custom comparator.
import java.util.*;

// A reverse comparator for strings.
class MyComp
    implements Comparator {
  public int compare(Object a, Object b) {
    String aStr, bStr;

    aStr = (String) a;
    bStr = (String) b;

    // reverse the comparison
    return bStr.compareTo(aStr);
  }

  // no need to override equals
}

class CompDemo {
  public static void main(String args[]) {
    // Create a tree set
    TreeSet ts = new TreeSet(new MyComp());

    // Add elements to the tree set
    ts.add("C");
    ts.add("A");
    ts.add("B");
    ts.add("E");
    ts.add("F");
    ts.add("D");

    // Get an iterator
    Iterator i = ts.iterator();

    // Display elements
    while (i.hasNext()) {
      Object element = i.next();
      System.out.print(element + " ");
    }
    System.out.println();
  }
}