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);
}
}