我很难弄清楚为什么当我运行我的代码时，它会跳过所有的if语句而只是将其置于无效状态。我有一个二维数组，值表示电影院，我应该卖票，用户应该输入一笔钱，确定他们要坐在哪里，这是他们可以负担得起的最昂贵的座位选择。该人所在的座位应从任何数字更改为0。最后，我需要用零打印新数组。
这是我尝试过的：
public static void main(String[] args) {
Scanner in = new Scanner (System.in);
boolean done = false;
//initial seating chart
int [] [] table =
{
{10, 10, 10, 10, 10, 10, 10, 10, 10, 10},
{10, 10, 10, 10, 10, 10, 10, 10, 10, 10},
{10, 10, 10, 10, 10, 10, 10, 10, 10, 10},
{20, 20, 20, 20, 20, 20, 20, 20, 20, 20},
{20, 20, 20, 20, 20, 20, 20, 20, 20, 20},
{30, 30, 30, 30, 30, 30, 30, 30, 30, 30},
{40, 40, 40, 40, 40, 40, 40, 40, 40, 40},
{40, 40, 40, 40, 40, 40, 40, 40, 40, 40},
{50, 50, 50, 50, 50, 50, 50, 50, 50, 50},
};
while (!done) {
int row; int col;
//search seating chart
for (row=0; row<9; row++) {
for (col=0; col<8; col++) {
System.out.printf("Enter maximum amount that you would like to spend on the tickets: ");
int amount = in.nextInt();
if (table[row][col]==10 && 10<=amount && amount<20) {
table[row][col]=0;
System.out.printf("Ticket located at Row %d Seat %d purchased for 10\n", row+1, col+1);
System.out.print("Would you like to purchase additional tickets? (Y/N) " + in.next());
if (in.hasNext("y")) {
done = false;
}
else {done = true;
}
}
else if (table[row][col]==20 && 20<=amount && amount<30) {
table[row][col]=0;
System.out.printf("Ticket located at Row %d Seat %d purchased for 20\n", row+1, col+1);
System.out.print("Would you like to purchase additional tickets? (Y/N) " + in.next());
if (in.hasNext("y")) {
done = false;
}
else {done = true;
}
}
else if (table[row][col]==30 && 30<=amount && amount<40) {
table[row][col]=0;
System.out.printf("Ticket located at Row %d Seat %d purchased for 30\n", row+1, col+1);
System.out.print("Would you like to purchase additional tickets? (Y/N) " + in.next());
if (in.hasNext("y")) {
done = false;
}
else {done = true;
}
}
else if (table[row][col]==40 && 40<=amount && amount<50) {
table[row][col]=0;
System.out.printf("Ticket located at Row %d Seat %d purchased for 40\n", row+1, col+1);
System.out.print("Would you like to purchase additional tickets? (Y/N) " + in.next());
if (in.hasNext("y")) {
done = false;
}
else {
done = true;
}
}
else if (table[row][col]==50 && 50<=amount) {
table[row][col]=0;
System.out.printf("Ticket located at Row %d Seat %d purchased for 50\n", row+1, col+1);
System.out.print("Would you like to purchase additional tickets? (Y/N) " + in.next());
if (in.hasNext("y")) {
done = false;
}
else {done = true;
}
}
else {System.out.print("invalid");}
}}}
//final seating chart
System.out.print(table);
}
}
答案 0 :(得分：0)
这里有一个样本，可以更好地理解，我在这里涵盖了一个案例，因为其余案例大致相同
//private variable here so we could find and book seat through method findAvailableSeat()
private static int[][] table = { { 10, 10, 10, 10, 10, 10, 10, 10, 10, 10 }, { 10, 10, 10, 10, 10, 10, 10, 10, 10, 10 },
{ 10, 10, 10, 10, 10, 10, 10, 10, 10, 10 }, { 20, 20, 20, 20, 20, 20, 20, 20, 20, 20 },
{ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20 }, { 30, 30, 30, 30, 30, 30, 30, 30, 30, 30 },
{ 40, 40, 40, 40, 40, 40, 40, 40, 40, 40 }, { 40, 40, 40, 40, 40, 40, 40, 40, 40, 40 },
{ 50, 50, 50, 50, 50, 50, 50, 50, 50, 50 }, };
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
boolean done = false;
// initial seating chart
while (!done) {
int row;
int col;
// search seating chart
System.out.printf("Enter maximum amount that you would like to spend on the tickets: ");
int amount = in.nextInt();
if (10 <= amount && amount < 20) {
String location = findAvailableSeat(10);//store the indexes in a variable to show the user later
if(location != null) {
String[] locationList = location.split(",");
row = Integer.parseInt(locationList[0]);
col = Integer.parseInt(locationList[1]);
System.out.printf("Ticket located at Row %d Seat %d purchased for 10\n", row + 1, col + 1);
System.out.print("Would you like to purchase additional tickets? (Y/N) ");
String resp = in.next(); //this statement is needed as sometimes with in.next() rushes to user input without printing text
if (resp.equals("Y")) {
done = false;
} else {
done = true;
}
}
else
System.out.printf("No available seat found\n");
}
}
}
在我们拥有的方法中
private static String findAvailableSeat(int i) {
// TODO Auto-generated method stub
for (int row=0; row<9; row++) {
for (int col=0; col<8; col++) {
if(table[row][col]==i) {
//find the seat location, set location to 0 and then return indices to show in user result
table[row][col] = 0;
return row + "," + col;
}
}
}
return null;
}