[英]Why can't I properly remove an item from this array?
刪除項目時,將從陣列中刪除它,然后打印一條消息,指出該項目已被刪除。
我知道,由於數組未排序,因此刪除項目的最簡單方法是將當前的最后一個項目移到其位置,然后減少項目數。
我做錯了什么? 我該如何解決?
public static int removeBall(String[] hookPotentialArray, String[] nameBallArray, int[] ballWeightArray, int count) {
Scanner keyboard = new Scanner(System.in);
System.out.println("Please enter the name of the ball you would like to remove: ");
String name = keyboard.nextLine();
boolean ballRemoval = false;
for (int i = 0; i < count; i++) {
if (name.compareToIgnoreCase(nameBallArray[i]) == 0 && !ballRemoval) {
nameBallArray[i] = nameBallArray[count - 1];
ballWeightArray[i] = ballWeightArray[count - 1];
hookPotentialArray[i] = hookPotentialArray[count - 1];
ballRemoval = true;
count--;
System.out.println("The ball you selected to be removed "
+ "has been removed.");
System.out.println("");
}
}
return count;
}
最好創建一個Ball
類來存儲名稱,權重和潛在值,並使用List
來存儲Ball
對象。 List
也有自己的添加和刪除項目的方法。
(1)您應使用break退出搜索
(2)刪除最后一項時,應添加特殊檢查
(3)請記住,java數組實際上不會收縮,因此需要始終保持計數正確並在使用中
如下所示:
package tests.StackOverflow;
public class q27159679 {
public static void main(String[] args) {
String[] hookPotentialArray = {"alpha", "beta", "gamma", "delta"};
String[] nameBallArray = {"A", "B", "C", "D"};
int[] ballWeightArray = {11, 12, 13, 14};
int count = hookPotentialArray.length;
printBalls(nameBallArray, count);
count = removeBall(hookPotentialArray, nameBallArray, ballWeightArray, count, "B");
count = removeBall(hookPotentialArray, nameBallArray, ballWeightArray, count, "D");
}
public static int removeBall(String[] hookPotentialArray, String[] nameBallArray, int[] ballWeightArray, int count, String name) {
System.out.println("Removing ball " + name);
for (int i = 0; i < count; i++) {
if (name.compareToIgnoreCase(nameBallArray[i]) == 0 ) {
if( i < count - 1) {
nameBallArray[i] = nameBallArray[count - 1];
ballWeightArray[i] = ballWeightArray[count - 1];
hookPotentialArray[i] = hookPotentialArray[count - 1];
}
count--;
System.out.println("The ball you selected to be removed "
+ "has been removed.");
printBalls(nameBallArray, count);
System.out.println("");
break;
}
}
return count;
}
public static void printBalls(String[] nameBallArray, int count) {
System.out.print("The remaining balls: ");
for(int i=0; i<count; ++i) {
System.out.print(nameBallArray[i] + " ");
}
System.out.println("");
}
}
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