[問題] non-satic variable this cannot be...
不多說 code 很短 直接貼上code
import java.util.*;
public class Access {
class Super{
String A = "SUPER";
void Print(){
System.out.println("Hey I am Super my a is " + A);
}
}
class Sub extends Super{
String A = "SUb";
void Print(){
System.out.println("Hey I am Sub my a is " + A);
}
}
public static void main(String args[]){
Sub sub = new Sub();
Super sup = sub;
}
}
結果compile 之後 出現了這個訊息
Access.java:18: non-static variable this cannot be referenced from a static context
Sub sub = new Sub();
^
1 error
想請問是為什麼呢？
我知道如果把那兩個class 拉到主class 的外面就會過了
不過主要是想知道為什麼... Sub sub = new Sub()
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