Java笔试题，

Java笔试题，

多态构造过程:

结果：132

 

public class TestChild {
	public static void main(String[] args) {
		new Child("mike");
	}
}
class People{
	private String name;
	public People(){
		System.out.println("People()...");
		System.out.print("1");
	}
	public People(String name){
		System.out.print("2");
		this.name = name;
	}
}
class Child extends People{
	People father;
	
	public Child(String name){
		//默认调用父类的无参构造super(),--不管有没有声明super()， 如果显式的调用super(实参列表)那么不会调用父类无参构造
		//这里省略了super()
		System.out.print("3");  
		father = new People(name +" F");
	}
	public Child(){
		System.out.print("4");
	}
}