构造函数重载和this调用构造函数

class test 
{
	public static void main(String[] args) 
	{
		Dog dog=new Dog();
		dog.printAgeCount();
	}
}

class Dog
{
	int age=0;
	String name="alex";

	Dog(int age){
		this.age=age;
		System.out.println("age="+age);
	}
	Dog(String name){
		System.out.println("name="+name);
		this.name=name;
	}
	Dog(String name,int age){
		this(age);
		this.name=name;
		System.out.println("String & int age");
	}
	Dog(){
		this("hello",20);
		System.out.println("default constructor (no args)");
	}
	void printAgeCount(){
		System.out.println("age="+age+"name="+name);
	}
}

 除了构造函数外，编译器禁止在其他任何方法中调用构造函数。