Опитвам се да сортирам ArrayList с 3 карти в него. Правя това с Comparator. (Това пресилено ли е)? Card.getRank() връща цяло число между 2 и 14. Нямам абсолютно никаква представа къде греша. Правил съм това успешно преди и в сравнение с другия ми код изглежда същото. Ще съм много благодарен, ако някой може да разясни това!
public int getHand(Card c1, Card c2, Card c3) {
ArrayList<Card> hand = new ArrayList<Card>();
hand.add(c1);
hand.add(c2);
hand.add(c3);
Collections.sort(hand, new SortCards());
package com.evorlor.threecardpoker;
import java.util.Comparator;
public class SortCards implements Comparator<Card> {
@Override
public int compare(Card card1, Card card2) {
if ((card1.getRank() - card2.getRank()) > 0) {
return 1;
}
if ((card1.getRank() - card2.getRank()) < 0) {
return -1;
}
return 0;
}
}
LOGCAT:
08-06 18:32:56.155: E/AndroidRuntime(4906): FATAL EXCEPTION: main
08-06 18:32:56.155: E/AndroidRuntime(4906): java.lang.IllegalStateException: Could not execute method of the activity
08-06 18:32:56.155: E/AndroidRuntime(4906): at android.view.View$1.onClick(View.java:3599)
08-06 18:32:56.155: E/AndroidRuntime(4906): at android.view.View.performClick(View.java:4204)
08-06 18:32:56.155: E/AndroidRuntime(4906): at android.view.View$PerformClick.run(View.java:17355)
08-06 18:32:56.155: E/AndroidRuntime(4906): at android.os.Handler.handleCallback(Handler.java:725)
08-06 18:32:56.155: E/AndroidRuntime(4906): at android.os.Handler.dispatchMessage(Handler.java:92)
08-06 18:32:56.155: E/AndroidRuntime(4906): at android.os.Looper.loop(Looper.java:137)
08-06 18:32:56.155: E/AndroidRuntime(4906): at android.app.ActivityThread.main(ActivityThread.java:5041)
08-06 18:32:56.155: E/AndroidRuntime(4906): at java.lang.reflect.Method.invokeNative(Native Method)
08-06 18:32:56.155: E/AndroidRuntime(4906): at java.lang.reflect.Method.invoke(Method.java:511)
08-06 18:32:56.155: E/AndroidRuntime(4906): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
08-06 18:32:56.155: E/AndroidRuntime(4906): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
08-06 18:32:56.155: E/AndroidRuntime(4906): at dalvik.system.NativeStart.main(Native Method)
08-06 18:32:56.155: E/AndroidRuntime(4906): Caused by: java.lang.reflect.InvocationTargetException
08-06 18:32:56.155: E/AndroidRuntime(4906): at java.lang.reflect.Method.invokeNative(Native Method)
08-06 18:32:56.155: E/AndroidRuntime(4906): at java.lang.reflect.Method.invoke(Method.java:511)
08-06 18:32:56.155: E/AndroidRuntime(4906): at android.view.View$1.onClick(View.java:3594)
08-06 18:32:56.155: E/AndroidRuntime(4906): ... 11 more
08-06 18:32:56.155: E/AndroidRuntime(4906): Caused by: java.lang.NullPointerException
08-06 18:32:56.155: E/AndroidRuntime(4906): at com.evorlor.threecardpoker.SortCards.compare(SortCards.java:10)
08-06 18:32:56.155: E/AndroidRuntime(4906): at com.evorlor.threecardpoker.SortCards.compare(SortCards.java:1)
08-06 18:32:56.155: E/AndroidRuntime(4906): at java.util.TimSort.countRunAndMakeAscending(TimSort.java:320)
08-06 18:32:56.155: E/AndroidRuntime(4906): at java.util.TimSort.sort(TimSort.java:185)
08-06 18:32:56.155: E/AndroidRuntime(4906): at java.util.TimSort.sort(TimSort.java:169)
08-06 18:32:56.155: E/AndroidRuntime(4906): at java.util.Arrays.sort(Arrays.java:2038)
08-06 18:32:56.155: E/AndroidRuntime(4906): at java.util.Collections.sort(Collections.java:1891)
package com.evorlor.threecardpoker;
public class Card {
private int rank;
private char suit;
public Card(int rank, char suit) {
super();
this.rank = rank;
this.suit = suit;
}
public int getRank() {
return rank;
}
public char getSuit() {
return suit;
}
}
Card
? - person tbodt   schedule 07.08.2013null
наgetHand
? - person Dennis Meng   schedule 07.08.2013Card
обекти е null, или един от тях връща null отgetRank()
. Горещо препоръчвам да се научите да използвате дебъгера. - person Dawood ibn Kareem   schedule 07.08.2013