关于Java包装类装箱拆箱的小例子

简单来说：装箱就是把值类型转变为引用类型，拆箱就是把引用类型转变为值类型
其实这东西没什么好说的，上代码看看就明白了：
Java代码
/**
* @author hellosure
* @time 2011-7-27 上午8:10:46
* @description：装箱拆箱例子
*/
public class Test {

    public static void main(String arg[]) {
        int v1 = 100;
        int v2 = 100;
        //自动装箱
        Integer autovalue1 =   100 ;
        Integer autovalue2 =   100 ;
        //手动装箱两种方式
        Integer value1 = Integer.valueOf(v1);
        Integer value2 = Integer.valueOf(v2);
        Integer va1 = new Integer(v1);
        Integer va2 = new Integer(v2);
        //自动拆箱
        int autov1 = autovalue1;
        int autov2 = autovalue2;
        //手动拆箱
        int vv1 = value1.intValue();
        int vv2 = value2.intValue();


        System.out.println(" v1 == v2 is "+ (v1 == v2));
        System.out.println(" autovalue1 == autovalue2 is "+ (autovalue1 == autovalue2));
        System.out.println(" value1 == value2 is " + (value1 == value2));
        System.out.println(" va1 == va2 is "+ (va1 == va2));
        System.out.println(" va1 equals va2 is "+ (va1.equals(va2)));
        System.out.println(" autov1 == autov2 is "+ (autov1 == autov2));
        System.out.println(" vv1 == vv2 is "+ (vv1 == vv2));

        System.out.println("-----------------------------------------------------");

        String strv1 = "100";
        String strv2 = "100";
        String stringv1 = new String("100");
        String stringv2 = new String("100");
        Integer strvalue1 = Integer.parseInt(strv1);
        Integer strvalue2 = Integer.parseInt(strv2);
        Integer stringvalue1 = Integer.parseInt(stringv1);
        Integer stringvalue2 = Integer.parseInt(stringv2);
        Integer newstrv1 = new Integer(strv1);
        Integer newstrv2 = new Integer(strv2);

        System.out.println(" strv1 == strv2 is "+ (strv1 == strv2));
        System.out.println(" stringv1 == stringv2 is "+ (stringv1 == stringv2));
        System.out.println(" stringv1 equals stringv2 is "+ (stringv1.equals(stringv2)));
        System.out.println(" strvalue1 == strvalue2 is "+ (strvalue1 == strvalue2));
        System.out.println(" stringvalue1 == stringvalue2 is "+ (stringvalue1 == stringvalue2));
        System.out.println(" newstrv1 == newstrv2 is "+ (newstrv1 == newstrv2));
        System.out.println(" newstrv1 equals newstrv2 is "+ (newstrv1.equals(newstrv2)));

        System.out.println("-----------------------------------------------------");

        int v3 = 200;
        int v4 = 200;
        //自动装箱
        Integer autovalue3 =   200 ;
        Integer autovalue4 =   200 ;
        //手动装箱两种方式
        Integer value3 = Integer.valueOf(v3);
        Integer value4 = Integer.valueOf(v4);
        Integer va3 = new Integer(v3);
        Integer va4 = new Integer(v4);
        //自动拆箱
        int autov3 = autovalue3;
        int autov4 = autovalue4;
        //手动拆箱
        int vv3 = value3.intValue();
        int vv4 = value4.intValue();


        System.out.println(" v3 == v4 is "+ (v3 == v4));
        System.out.println(" autovalue3 == autovalue4 is "+ (autovalue3 == autovalue4));
        System.out.println(" value3 == value4 is " + (value3 == value4));
        System.out.println(" va3 == va4 is "+ (va3 == va4));
        System.out.println(" va3 equals va4 is "+ (va3.equals(va4)));
        System.out.println(" autov3 == autov4 is "+ (autov3 == autov4));
        System.out.println(" vv3 == vv4 is "+ (vv3 == vv4));

        System.out.println("-----------------------------------------------------");

        String strv3 = "200";
        String strv4 = "200";
补充：软件开发 , Java ,