class Miner{
static int x=7;
static String s = null;
public static void getWeight(Mineral m){
int y=0/x;
System.out.println(s+"haha");
}
public static void main(String ... args){
Mineral[] ma = {new Mineral(),new Gem()};
for(Object o:ma){
getWeight((Mineral)o);
}
}
}
class Mineral{}
class Gem extends Mineral{}
输出nullhaha,我怎么理解不了
static int x=7;
static String s = null;
public static void getWeight(Mineral m){
int y=0/x;
System.out.println(s+"haha");
}
public static void main(String ... args){
Mineral[] ma = {new Mineral(),new Gem()};
for(Object o:ma){
getWeight((Mineral)o);
}
}
}
class Mineral{}
class Gem extends Mineral{}
输出nullhaha,我怎么理解不了
nullhaha
nullhaha
数组中有两个元素啊 ,循环两次,每次都打印 s+"haha" ,就是 nullhaha,有什么不理解的
如果你定义int s=1然后,println(s+"haha"),最终打出来的就是1haha。道理很简单,强制转换而已
结果就是
nullhaha
nullhaha