java例程练习（Map接口及自动打包、解包）

import java.util.*;

public class Test {
    public static void main(String[] args) {
        Map m1 = new HashMap();
        Map m2 = new HashMap();

        m1.put("one", 1);
        //m1.put("one",new Integer(1));
        m1.put("two", 2);
        //m1.put("two",new Integer(2));
        m1.put("three", 3);
        //m1.put("three",new Integer(3));
        m2.put("A", 1);
        //m2.put("A", new Integer(1));
        m2.put("B", 2);
        //m2.put("B", new Integer(2));

        System.out.println(m1.size());
        System.out.println(m1.containsKey("one"));
        System.out.println
            (m2.containsValue(1));
            //(m2.containsValue(new Integer(1)));
        if(m1.containsKey("two")) {
            int i =(Integer)m1.get("two");
            //int i = ((Integer)m1.get("two")).intValue();
            System.out.println(i);
        }

        Map m3 = new HashMap(m1);
        m3.putAll(m2);
        System.out.println(m3);
    }
}

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补充：软件开发 , Java ,