java.util.TreeMap.containsKey(Object key) 方法示例

package com.codingdict;

import java.util.*;

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

      // creating tree map
      NavigableMap<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");

      System.out.println("Checking key value 6");
      System.out.println("Value for key 6 exists: "+ treemap.containsKey(6));
   }    
}