请选出以下程序的输出结果public class Child extends People {People father;public Child(String name) {System.out.print(3);this.name = name;father = new People(name + ":F");}public Child() {System.out.print(4);}public static void main(String[] args) {new Child("Alice");}}class People {String name;public People() {System.out.print(1);}public People(String name) {System.out.print(2);this.name = name;}}