Mega Code Archive
Binary Search an ArrayList
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using System;
using System.Collections;
class Album : IComparable, ICloneable {
private string _Title;
private string _Artist;
public Album(string artist, string title) {
_Artist = artist;
_Title = title;
}
public string Title {
get {
return _Title;
}
set {
_Title = value;
}
}
public string Artist {
get {
return _Artist;
}
set {
_Artist = value;
}
}
public override string ToString() {
return _Artist + ",\t" + _Title;
}
public int CompareTo(object o) {
Album other = o as Album;
if (other == null)
throw new ArgumentException();
if (_Artist != other._Artist)
return _Artist.CompareTo(other._Artist);
else
return _Title.CompareTo(other._Title);
}
public object Clone() {
return new Album(_Artist, _Title);
}
}
class TitleComparer : IComparer {
public int Compare(object l, object r) {
Album left = l as Album;
Album right = r as Album;
if ((left == null) || (right == null))
throw new ArgumentException();
if (left.Title != right.Title)
return left.Title.CompareTo(right.Title);
else
return left.Artist.CompareTo(right.Artist);
}
}
class Class1 {
static void Main(string[] args) {
ArrayList arr = new ArrayList();
arr.Add(new Album("G", "A"));
arr.Add(new Album("B", "G"));
arr.Add(new Album("S", "A"));
arr.Sort();
try {
foreach (Album a in arr) {
Console.WriteLine(a);
}
} catch (System.InvalidCastException e) {
}
arr.Sort(new TitleComparer());
foreach (Album a in arr) {
Console.WriteLine(a);
}
Album l = new Album("L", "G");
arr.Sort();
int index = arr.BinarySearch(l);
Console.WriteLine(index.ToString());
arr.Sort(new TitleComparer());
index = arr.BinarySearch(l, new TitleComparer());
Console.WriteLine(index.ToString());
}
}
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