java.util.TreeMap.keySet() 方法示例

package com.codingdict;

import java.util.*;

public class TreeMapDemo {
   public static void main(String[] args) {

      // creating tree map
      TreeMap<Integer, String> treemap = new TreeMap<Integer, String>();

      // populating tree map
      treemap.put(2, "two");
      treemap.put(1, "one");
      treemap.put(3, "three");
      treemap.put(6, "six");
      treemap.put(5, "five");

      // creating set
      Set set = treemap.keySet();

      // getting set view         
      System.out.println("Checking values of the set");
      System.out.println("Value is: "+set);
   }    
}