buyer.java

Java面向对象编程(随书配套源代码) 阐述了面向对象编程的思想

package chapter7;
public class Buyer
{
	public void buy()
	{
		System.out.println("买地瓜");
	}
	public void buy(String what)
	{
		System.out.println("买" + what);
	}
	public void buy(String what ,String howmuch)
	{
		System.out.println("买" + howmuch + what);
	}
	public void buy(String what,String howmuch,String where)
	{
		System.out.println("到"+ where + ",买" + howmuch + what);
	}
	
	public void buy(String what ,String howmuch,String where ,String when)
	{
		System.out.println(when + ",到"+ where + "买" + howmuch + what);
	}
	
	public static void main(String[] args)
	{
		Buyer buyer = new Buyer();
		buyer.buy();
		buyer.buy("大米");
		buyer.buy("大米","十斤");
		buyer.buy("大米","十斤","福州东街口");
		buyer.buy("大米","十斤","福州东街口","今晚八点");
	}
}