封装实例（汽车销售人员）

题目要求：

 具体代码：

public class Seller {
	private String id;
	private String name;
	private String cardId;
	private int age;
	private char sex = '男';
	public String getId() {
		return id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public char getSex() {
		return sex;
	}
	public void setSex(char sex) {
		this.sex = sex;
	}
	public String getCardId() {
		return cardId;
	}
	public void setCardId(String cardId) {
		if(cardId.length()==18) 
		this.cardId = cardId;
		else {
			this.cardId="00000000000000000";
		}
	}
	public void setAge(int age) {
		this.age = age;
	}
	
}