public class inner {
public static void main(String[] args) {
//方法：编译看左边，运行看右边
//变量：编译看左边，运行看左边
A cc = new B();
cc.kk();
System.out.println(cc.a);
}

}
class A {
int a = 9;
public void kk() {
System.out.println(“父类”);
}
public void cry() {
System.out.println(“父类特有”);
}
}
class B extends A {
int a = 10;
@Override
public void kk() {
System.out.println(“子类”);
}
public void cat() {
System.out.println(“子类特有”);
}
}