获取Java树集的大小

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import java.util.TreeSet;

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public class Main {/* 来自 nowjava*/

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  public static void main(String[] args) {

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    TreeSet tSet = new TreeSet();

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    System.out.println("Size of TreeSet : " + tSet.size());

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    //add elements to TreeSet object

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    tSet.add(new Integer("1"));

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    tSet.add(new Integer("2"));

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    tSet.add(new Integer("3"));

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    System.out.println("Size of TreeSet after addition : " + tSet.size());

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    //remove one element from TreeSet using remove method

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