person.java

JAVA培训用实用代码

import java.util.Date;
public class Person {
	private String name;
	private int age;
	private Date birthDate;
	public Person(String name, int age, Date d) {
		this.name = name;
		this.age = age;
		this.birthDate = d;
	}
	public Person(String name, int age) {
		this(name, age, null);
	}
	public Person(String name, Date d) {
		this(name, 30, d);
	}
	public Person(String name) {
		this(name, 30);
	}
	public static void main(String args[]){
		Date d1 = new Date(1970,1,1);
		Person p1 = new Person("Tom",18,d1);
		Person p2 = new Person("Bily",20);
		Person p3 = new Person("Kity",d1);
		Person p4 = new Person("John");
	}
	
}