java.util.TreeSet.clear() 方法示例

package com.codingdict;

import java.util.Iterator;
import java.util.TreeSet;

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

      // creating a TreeSet
      TreeSet <Integer>treeadd = new TreeSet<Integer>();

      // adding in the tree set
      treeadd.add(12);
      treeadd.add(13);
      treeadd.add(14);
      treeadd.add(15);

      // create an iterator
      Iterator iterator;
      iterator = treeadd.iterator();

      // displaying the Tree set data
      System.out.println("Tree set data: ");     

      while (iterator.hasNext()) {
         System.out.println(iterator.next() + " ");
      }

      // clearing the set
      System.out.println("Clearing tree");
      treeadd.clear();
      System.out.println("Size of the tree: "+treeadd.size());      
   }     
}