我正在做一个小程序，很难使用数组和扫描仪。我希望用户输入他玩过的游戏数量，然后输入他完成的游戏数量。之后，我想让他输入他完成每一场比赛所花费的时间。
我是新手，现在真的很困。我需要得到用户完成游戏的每一次时间的价值，因为我需要稍后对其应用一些统计数据。
我有两个错误！
这是我的一点代码：
import java.util.Scanner;
public class games {
public static void main(String args[]) {
Scanner input = new Scanner(System.in);
System.out.println("How many games have you played? (Limit of 10) : ");
int gamesplayed = input.nextInt();input.nextLine();
while ( gamesplayed < 0 || gamesplayed> 10 ) {
System.out.println("This number is invalid!");
System.exit(0);
}
System.out.println("How many of these games have you finished? (Limit of 10) : ");
int finishedgames = input.nextInt();input.nextLine();
while ( finishedgames < 0 || finishedgames > 10 || gamesplayed < finishedgames ) {
System.out.println("This number is invalid!");
System.exit(0);
}
int game = 1;
int list[]=new int[game];
while ( finishedgames+1 != game)
{
System.out.print("How many time you took to finish your game " + game);System.out.println("?");
list[game] = input.nextInt();
input.nextLine();
++game;
}
}
}
非常感谢你们的帮助！
public class Games {
public static void main(String args[]) {
Scanner input = new Scanner(System.in);
System.out.println("How many games have you played? (Limit of 10) : ");
String nextLine = input.nextLine();
int gamesplayed = toInteger(nextLine);
while (gamesplayed < 0 || gamesplayed > 10) {
System.out.println("Wrong input, try again.");
gamesplayed = toInteger(input.nextLine());
}
System.out.println(String.format(
"How many of these games have you finished? (Limit of %d) : ",
gamesplayed));
nextLine = input.nextLine();
int finishedgames = toInteger(nextLine);
while (finishedgames < 0 || finishedgames > gamesplayed ) {
System.out.println("Wrong input, try again.");
finishedgames = toInteger(input.nextLine());;
if (finishedgames > gamesplayed) {
System.out.print("Invalid Entry. ");
}
}
int list[] = new int[finishedgames];
for (int i = 0; i < finishedgames; i++){
System.out.println(String.format("How many time you took to finish your game %d?", i + 1));
int val = toInteger(input.nextLine());
while (val == Integer.MAX_VALUE) {
System.out.println("Wrong input, try again.");
val = toInteger(input.nextLine());
}
list[i] = val;
}
for (int i = 0; i < list.length; i++) {
System.out.println(String.format("list[%d] = %d", i, list[i]));
}
}
// Helper method that converts user entry to integer value
private static int toInteger(String nextLine) {
try {
return Integer.parseInt(nextLine);
} catch (NumberFormatException e) {
return Integer.MAX_VALUE;
}
}
}
import java.util.Scanner;
public class games {
public static void main(String args[]) {
Scanner input = new Scanner(System.in);
System.out.println("How many games have you played? (Limit of 10) : ");
int gamesplayed = input.nextInt();
while ( gamesplayed < 0 || gamesplayed> 10 ) {
System.out.println("This number is invalid!");
gamesplayed = input.nextInt();
}
System.out.println("How many of these games have you finished? (Limit of 10) : ");
int finishedgames = input.nextInt();
while ( finishedgames < 0 || finishedgames > 10 || gamesplayed < finishedgames ) {
System.out.println("This number is invalid!");
finishedgames = input.nextInt();
}
int game = 1,Rem =finishedgames-gamesplayed ;
int list[]=new int[Rem+1];
while (Rem!=0) {
System.out.println("How many time you took to finish your game " +game+"?");
list[game] = input.nextInt();
++game;
--Rem;
}
}
}
首先，请使用if语句，而不是两个while循环。
问题是这条线：int list[]=new int[game];
上面的行（int game=1;）将此变量的值设置为1，因此int数组只能存储一个elment。
您应该使用int list[]=new int[finishedgames];。
另外，考虑用for循环替换上一个while循环。
编辑：
import java.util.Scanner;
public class games {
public static void main(String args[]) {
Scanner input = new Scanner(System.in);
System.out.println("How many games have you played? (Limit of 10) : ");
int gamesplayed = input.nextInt();input.nextLine();
if ( gamesplayed < 0 || gamesplayed> 10 ) {
System.out.println("This number is invalid!");
System.exit(0);
}
System.out.println("How many of these games have you finished? (Limit of 10) : ");
int finishedgames = input.nextInt();input.nextLine();
if ( finishedgames < 0 || finishedgames > 10 || gamesplayed < finishedgames ) {
System.out.println("This number is invalid!");
System.exit(0);
}
int list[]=new int[finishedgames];
for (int i=0;i<list.length;i++) {
System.out.println("How many time you took to finish your game " + (i+1) + "?");
list[i] = input.nextInt();
input.nextLine();
}
}
}