每个基本数据类型都有其对应的类: int Integer double Double String 不是基本数据类型 boolean Booleanint i = 0; double d = 0.00; String s = "s"; boolean b = false;Integer iobj = new Integer(i); Double dojb = new Double(d); Boolean bobj = new Boolean(b); Object o = null; o = (Object)iobj; o = (Object)dojb; o = (Object)bobj; o = (Object)s;
int Integer
double Double
String 不是基本数据类型
boolean Booleanint i = 0;
double d = 0.00;
String s = "s";
boolean b = false;Integer iobj = new Integer(i);
Double dojb = new Double(d);
Boolean bobj = new Boolean(b);
Object o = null;
o = (Object)iobj;
o = (Object)dojb;
o = (Object)bobj;
o = (Object)s;