public class Main { private static Integer i1;//引用类型,也可称为包装类型 private static int i2;//基本类型 private static Bool b1; private static boolean b2; private static Long L1; private static long L2; private static Float f1; private static float f2; private static Object object;//引用类型 public static void main(String[] args) { // int默认值为0,boolean的默认值为false,null是任何引用类型的默认值 System.out.println(i1);//null System.out.println(i2);//0 System.out.println(b1);//null System.out.println(b2);//false System.out.println(L1);//null System.out.println(L2);//0 System.out.println(f1);//null System.out.println(f2);//0.0 System.out.println(object);//null } }
更多可参考:http://www.importnew.com/14229.html Java中有关Null的9件事