我把Map中value分别定义为int[](基本类型数组)和String[](引用型数组),代码和结果如下:

/* int[] */

import java.util.Map;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;

public class MapTest {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Map <String, int[]> m1=new HashMap<String,int[]>();
        String key1="Lucy";
        String key2="Lily";
        int[] m2={100,10,1};
        int[] m3={1,10,100};
        
        m1.put(key1, m2);
        m1.put(key2, m3);
        
        System.out.println(m1.get(key1));
        System.out.println(m1.containsKey("Lily"));
        System.out.println(m1.size());
    }
}
        输出结果为: [I@139a55
                    true
                    2

/* String[] */

import java.util.Map;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;

public class MapTest {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Map <String, String[]> m1=new HashMap<String,String[]>();
        String key1="Lucy";
        String key2="Lily";
        String[] m2={"Lucy的成绩","100","A"};
        String[] m3={"Lily的成绩","88","B"};
        
        m1.put(key1, m2);
        m1.put(key2, m3);
        
        System.out.println(m1.get(key1));
        System.out.println(m1.containsKey("Lily"));
        System.out.println(m1.size());
    }
}
            输出结果为: [Ljava.lang.String;@139a55
                        true
                        2

输出Map类型中的value时,结果都是一串地址,怎么得到值?
        

是因为数组是引用类型,直接get到的都是它的首地址吗?那在Map类型的value中怎么得到值,只能通过引用下标吗？
 System.out.println(m1.get(key1)[i]);

初学者遇到困难，向各路大神求解啊

[此贴子已经被作者于2016-3-28 16:13编辑过]