Java 获取HashMap的大小

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import java.util.HashMap;

/**

n o w  j a v a  . c o m

**/

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public class Main {

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  public static void main(String[] args) {

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    HashMap hMap = new HashMap();

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    System.out.println("Size of HashMap : " + hMap.size());

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    //add key value pairs to HashMap using put method

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    hMap.put("1","One");

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    hMap.put("2","Two");

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    hMap.put("3","Three");

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    System.out.println("Size of HashMap after addition : " + hMap.size());

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    //remove one element from HashMap using remove method

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    Object obj = hMap.remove("2");

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