?? comparablebook.java
字號:
/** A Book that can be compared to another Book by comparing their isbn
numbers using the compareTo() function. */
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);
}
/** Is the current Book equal to `other' using isbn for comparison?
Analysis: Time = O(1) */
public boolean equals(Object other)
{
return (compareTo(other) == 0);
}
}
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