public class Example4_10{
public static void main(String args[]){
 		//声明对象并分配内存
 		People 张三 = new People("张华",20); 
 	People 李四 = new People("自由职业者",true); 
 	People 无名 = new People();
	}
}
class People{
String name, career;
boolean sex = true; //true代表女,false代表男
int age;
double height;	

	public People(String name,int age){
		this.name = name;
		this.age = age;
		System.out.println("姓名:" + name + " 年龄:" + age);
	}
	 
	public People(String career,boolean sex){
		this.career=career;
		this.sex=sex;
 	System.out.println("职业:" + career + " 性别:" + sex);
	}
 
 	public People(){
	 	System.out.println(sex);
	}
}