問題： 出現(xiàn)ClassCastException 見下圖 ：圖片描述
程序代碼如下：
import java.util.*;
import net.mindview.util.*;
class Words
{
String s ;
int i ;
public Words (String s , int i )
{
this . s = s ;
this . i = i ;
}
}
public class HoldingEx22 {
public static void main(String[] args)
{
Set<String> words = new TreeSet<String>(
new TextFile("SetOperations.java", "\\W+"));
System.out.println(words);
Set <Words> wordSet = new TreeSet <Words> ( ) ;
System.out.println( );
for (String s : words)
{
int count = 0;
for (String m : words)
{
if (s . equals (m) )
{
count ++ ;
}
}
Words w = new Words (s , count - 1);
wordSet . add (w ) ;
}
System.out.println(wordSet);
}
}
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