This question already has answers here:
Non-static variable cannot be referenced from a static context
（12个答案）
Why we can not make an instance of inner class inside the main method of outer class in regular way?
（4个答案）
在8个月前关闭。
我正在尝试创建此问题的解决方案：“让函数BlackjackHighest（strArr）接受传递的strArr参数，该参数将是代表二十一点卡的数字和字母的数组。该数组中的数字将被写出。例如strArr可以是[“ two”，“ 3”，“ ace”，“ king”]。strArr的完整功能列表包括：两个，三个，四个，五个，六个，七个，八个，九个，十个，杰克，皇后，国王，王牌。您的程序应在下方，上方或二十一点输出，表示您是否有二十一点（数字加起来等于21），以及您手中是否有二十一点的最高牌。包含一个ace，但是您的手牌将超过21，因此您必须将ace视为1。您必须始终尝试将其保持在21标记以下。因此，使用上述数组，输出应位于king之下。在此示例中为1，因为如果不是，那么您将高于21。
另一个示例是，如果strArr为[“ four”，“ ten”，“ king”]，则此处的输出应高于king。如果您的手牌和十张面孔牌之间有平局，请将面孔牌作为“最高牌”返还。如果您有多张面孔卡，则重要性顺序为杰克，皇后，国王。”
我尝试了以下代码
但是得到一个错误：
（12个答案）
Why we can not make an instance of inner class inside the main method of outer class in regular way?
（4个答案）
在8个月前关闭。
我正在尝试创建此问题的解决方案：“让函数BlackjackHighest（strArr）接受传递的strArr参数，该参数将是代表二十一点卡的数字和字母的数组。该数组中的数字将被写出。例如strArr可以是[“ two”，“ 3”，“ ace”，“ king”]。strArr的完整功能列表包括：两个，三个，四个，五个，六个，七个，八个，九个，十个，杰克，皇后，国王，王牌。您的程序应在下方，上方或二十一点输出，表示您是否有二十一点（数字加起来等于21），以及您手中是否有二十一点的最高牌。包含一个ace，但是您的手牌将超过21，因此您必须将ace视为1。您必须始终尝试将其保持在21标记以下。因此，使用上述数组，输出应位于king之下。在此示例中为1，因为如果不是，那么您将高于21。
另一个示例是，如果strArr为[“ four”，“ ten”，“ king”]，则此处的输出应高于king。如果您的手牌和十张面孔牌之间有平局，请将面孔牌作为“最高牌”返还。如果您有多张面孔卡，则重要性顺序为杰克，皇后，国王。”
我尝试了以下代码
import java.util.*;
import java.io.*;
public class Main {
static String BlackjackHighest(String[] strArr) {
Card[] cards = new Card[strArr.length];
for (int i = 0; i < strArr.length; i++) {
cards[i] = new Card(strArr[i]);
}
Arrays.sort(cards, new Comparator<Card>() {
@Override
public int compare(Card card, Card card2) {
if (card.rating > card2.rating) return 1;
else if (card.rating < card2.rating) return -1;
return 0;
}
});
int total = 0;
boolean hasAce = false, aceUsed = false;
for (Card card : cards) {
if (card.rating == 14) {
hasAce = true;
}
if (total + card.topVal > 21) {
total += card.lowVal;
} else {
if (card.rating == 14) {
aceUsed = true;
}
total += card.topVal;
}
}
Card highest = cards[cards.length - 1];
if (hasAce && !aceUsed) {
highest = cards[cards.length - 2];
}
if (total < 21) {
return "below " + highest.repr;
} else if (total == 21) {
return "blackjack " + highest.repr;
}
return "above " + highest.repr;
}
class Card {
int lowVal = 0, topVal = 0, rating = 0;
String repr;
Card(String card) {
card = card.toLowerCase();
repr = card;
if (card.equals("two")) {
lowVal = 2; topVal = 2; rating = 2;
} else if (card.equals("three")) {
lowVal = 3; topVal = 3; rating = 3;
} else if (card.equals("four")) {
lowVal = 4; topVal = 4; rating = 4;
} else if (card.equals("five")) {
lowVal = 5; topVal = 5; rating = 5;
} else if (card.equals("six")) {
lowVal = 6; topVal = 6; rating = 6;
} else if (card.equals("seven")) {
lowVal = 7; topVal = 7; rating = 7;
} else if (card.equals("eight")) {
lowVal = 8; topVal = 8; rating = 8;
} else if (card.equals("nine")) {
lowVal = 9; topVal = 9; rating = 9;
} else if (card.equals("ten")) {
lowVal = 10; topVal = 10; rating = 10;
} else if (card.equals("jack")) {
lowVal = 10; topVal = 10; rating = 11;
} else if (card.equals("queen")) {
lowVal = 10; topVal = 10; rating = 12;
} else if (card.equals("king")) {
lowVal = 10; topVal = 10; rating = 13;
} else if (card.equals("ace")) {
lowVal = 1; topVal = 11; rating = 14;
}
}
}
public static void main (String[] args) {
// keep this function call here
Scanner s = new Scanner(System.in);
Main c = new Main();
System.out.print(c.BlackjackHighest(s.nextLine()));
}
}
但是得到一个错误：
Main.java:10: error: non-static variable this cannot be referenced from a static context
cards[i] = new Card(strArr[i]);
最佳答案
这段代码成功了
import java.util.*;
import java.io.*;
class Main {
public static String BlackjackHighest(String[] strArr) {
Card[] cards = new Card[strArr.length];
for (int i = 0; i < strArr.length; i++) {
cards[i] = new Card(strArr[i]);
}
Arrays.sort(cards, new Comparator<Card>() {
@Override
public int compare(Card card, Card card2) {
if (card.rating > card2.rating) return 1;
else if (card.rating < card2.rating) return -1;
return 0;
}
});
int total = 0;
boolean hasAce = false, aceUsed = false;
for (Card card : cards) {
if (card.rating == 14) {
hasAce = true;
}
if (total + card.topVal > 21) {
total += card.lowVal;
} else {
if (card.rating == 14) {
aceUsed = true;
}
total += card.topVal;
}
}
Card highest = cards[cards.length - 1];
if (hasAce && !aceUsed) {
highest = cards[cards.length - 2];
}
if (total < 21) {
return "below " + highest.repr;
} else if (total == 21) {
return "blackjack " + highest.repr;
}
return "above " + highest.repr;
}
public static class Card {
int lowVal = 0, topVal = 0, rating = 0;
String repr;
Card(String card) {
card = card.toLowerCase();
repr = card;
if (card.equals("two")) {
lowVal = 2; topVal = 2; rating = 2;
} else if (card.equals("three")) {
lowVal = 3; topVal = 3; rating = 3;
} else if (card.equals("four")) {
lowVal = 4; topVal = 4; rating = 4;
} else if (card.equals("five")) {
lowVal = 5; topVal = 5; rating = 5;
} else if (card.equals("six")) {
lowVal = 6; topVal = 6; rating = 6;
} else if (card.equals("seven")) {
lowVal = 7; topVal = 7; rating = 7;
} else if (card.equals("eight")) {
lowVal = 8; topVal = 8; rating = 8;
} else if (card.equals("nine")) {
lowVal = 9; topVal = 9; rating = 9;
} else if (card.equals("ten")) {
lowVal = 10; topVal = 10; rating = 10;
} else if (card.equals("jack")) {
lowVal = 10; topVal = 10; rating = 11;
} else if (card.equals("queen")) {
lowVal = 10; topVal = 10; rating = 12;
} else if (card.equals("king")) {
lowVal = 10; topVal = 10; rating = 13;
} else if (card.equals("ace")) {
lowVal = 1; topVal = 11; rating = 14;
}
}
}
public static void main (String[] args) {
// keep this function call here
Scanner s = new Scanner(System.in);
Main c = new Main();
System.out.print(c.BlackjackHighest(s.nextLine()));
}
}
10-06 10:51