代码2:Person p2 = new Person("李四" , '女' , 28)
代码3:p2.age = 33
代码4:System.out.println(p2.toString())
运行结果:
姓名: 张三 性别: 女 年龄: 20
姓名: 李四 性别: 女 年龄: 33
public class A1 {public A1() {
System.out.println("This is A")
}
public static void main(String[] args) {
A1 c1 = new C1()
}
}
class B1 extends A1{
public B1() {
System.out.println("This is B")
}
}
class C1 extends B1 {
public C1() {
System.out.println("This is C")
}
}