comparablebook.java

来自「国外的数据结构与算法分析用书」· Java 代码 · 共 21 行

package patronBook;

/**	A Book that can be compared to another BOOK by comparing their isbn
	numbers. The class defines the infix operators <, <=, > and  >=. */
	
public class ComparableBook extends Book implements Comparable
{
	/**	constructor */
	public ComparableBook(String t, String a, String i)
	{
		super(t, a, i);
	}

	/**	Is the current BOOK less than `other'?
		Analysis: Time = O(1) */
	public int compareTo(Object other)
	{
		return isbn.compareTo(((Book)other).isbn);
	}
}