ClassCastException が発生する理由とその修正方法を教えてください。次の例外メッセージを受け取りました。コードは以下のとおりです。
Exception in thread "main" java.lang.ClassCastException:
java.lang.String cannot be cast to java.lang.Integer
at HighScores.sort(HighScores.java:32)
at HighScores.main(HighScores.java:10)
これが私のコードです：
import java.util.*;
public class HighScores {
public static void main( String args[] )
{
ArrayList<String> names = new ArrayList();
ArrayList<Integer> scores = new ArrayList();
initialize( names, scores );
sort( names, scores );
display( names, scores );
}
public static void initialize( ArrayList names, ArrayList scores )
{
Scanner in = new Scanner( System.in );
for ( int i = 0; i < 5; i++ )
{
System.out.println( "Enter the name for score # " + (i + 1) + ": " );
names.add( in.next() );
System.out.println( "Enter the score for score # " + (i + 1) + ": " );
scores.add( in.next() );
}
}
public static void sort( ArrayList<String> names, ArrayList<Integer> scores )
{
for ( int i = 0; i < (4); i++ )
{
for ( int j = (i + 1); j < (3); j++ )
{
/*Line 32 -->*/ if ( scores.get( i ) < scores.get( j ) )
{
int tempScore = scores.get( i );
scores[i] = scores[j];
scores[j] = tempScore;
String tempName = names.get( i );
names[i] = names[j];
names[j] = tempName;
scores.add( i, maxValue );
scores.remove( j );
scores.add( j, temp );
String tempName = names.get( i );
String maxName = names.get( j );
names.remove( i );
names.add( i, maxName );
names.remove( j );
names.add( j, tempName );
}
}
}
}
public static void display( ArrayList names, ArrayList scores )
{
System.out.println( "Top Scorers: " );
System.out.println( names );
System.out.println( scores );
}
}