public class Sub extends Super {// 子类Sub 继承父类Super
public static void main(String[] args) {
System.out.println(new Sub().j);
}
int j = 30;
public Sub() {
print();
j = 40;
}
void print() {
System.out.println(j);
}
}
class Super {// 父类
int i = 10;
public Super() {
print();
int i = 20;
}
void print() {
System.out.println(i);
}
}