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