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从哈希集中删除所有元素
import java.util.HashSet; /** nowjava.com 提供 **/ public class Main { public static void main(String[] args) { HashSet hSet = new HashSet(); hSet.add(new Integer("1")); hSet.add(new Integer("2")); hSet.add(new Integer("3")); System.out.println("HashSet before removal : " + hSet); hSet.clear(); System.out.println("HashSet after removal : " + hSet); System.out.println("Is HashSet empty ? " + hSet.isEmpty()); } }