Java 获取HashSet的大小

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 /* from 时代Java - N o w  J a v a . c o m*/

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import java.util.HashSet;

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public class Main {

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  public static void main(String[] args) {

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    HashSet hSet = new HashSet();

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    System.out.println("Size of HashSet : " + hSet.size());

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    //add elements to HashSet object

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    hSet.add(new Integer("1"));

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    hSet.add(new Integer("2"));

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    hSet.add(new Integer("3"));

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    System.out.println("Size of HashSet after addition : " + hSet.size());

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    //remove one element from HashSet using remove method

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