Java基础之继承

package Basic;

public class TextExtends {
	public static void main(String[] args)
	{
		Man man = new Man(22,"Double");
		man.sound();
		man.hear();
	}
}

class Animals
{
	int age;
	String name ;
	public Animals(int age ,String name)
	{
		this.age = age ;
		this.name = name ;
	}
	public void sound()
	{
		System.out.println("Thie is sounding");
	}
}

 class Man extends Animals
{
	public Man(int age ,String name){
		super(age,name);
		System.out.println(name+"'s age is "+age);
	}
	public void hear()
	{
		System.out.println("Thie is hearing");
	}
}

①没有声明public的类需要，定义对象；

②一个文件只能声明一个public类；

③类继承（extends）后，子类可以使用父类的参数和方法（若是private声明除外）。