testencapsulation.java

有关于java中的继承

public class TestEncapsulation{
	public static void main(String[] args){
		CreditCard card=new CreditCard();
		//System.out.println(card.password);
		//card.password="654";
		System.out.println(card.getPassword());
		card.setPassword("654321");
		System.out.println(card.getPassword());
			
	}
}
class CreditCard{
	private String password="123456";
	public String getPassword(){
		return password;
	}
	public void setPassword(String password){
		if (password.length()!=6) return;
		this.password=password;
	}
}