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Alexon Classic
Alexon Classic
Asked:2020-10-21 00:30:03 +0000 UTC2020-10-21 00:30:03 +0000 UTC 2020-10-21 00:30:03 +0000 UTC

为什么我会收到 OutOfBoundsException

  • 772

points[0] = pointFiller(scanner);当我运行该程序时,我在Can't figure out why...中收到 OutOfBoundsException

预先感谢您的回复


public class Point {
    private int lineCount;
    private final int x;
    private final int y;

    public Point(int x, int y) {
        this.x = x;
        this.y = y;
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }

    Point[] points = new Point[lineCount];

    public void pointsCreator() {
        Scanner scanner = new Scanner(System.in);
        lineCount = scanner.nextInt();

        System.out.println("----------------------");
        System.out.println("enter points for first line: ");
        points[0] = pointFiller(scanner);

        for (int i = 1; i < lineCount; i++){
            System.out.println("----------------------");
            System.out.println("enter points for next line:");
            points[i] = pointFiller(scanner);
        }

        System.out.println("----------------------");
        System.out.println(Arrays.toString(points));
    }

    public static Point pointFiller(Scanner scanner) {
        System.out.print("     - enter x: ");
        int x = scanner.nextInt();

        System.out.print("     - enter y: ");
        int y = scanner.nextInt();

        return new Point(x, y);
    }

    @Override
    public String toString() {
        return "Points for line {x = " + x + ", y = " + y + '}';
    }
}
java
  • 2 2 个回答
  • 10 Views

2 个回答

  • Voted
  1. Best Answer
    post_zeew
    2020-10-21T00:34:52Z2020-10-21T00:34:52Z

    这是因为默认lineCount值初始化为零,然后您创建一个长度为零的数组:

    Point[] points = new Point[lineCount];
    

    创建数组后,输入值lineCount。

    试试这样:

    public class Point {
        private int lineCount;
        private final int x;
        private final int y;
    
        public Point(int x, int y) {
            this.x = x;
            this.y = y;
        }
    
        public int getX() {
            return x;
        }
    
        public int getY() {
            return y;
        }
    
        Point[] points;
    
        public void pointsCreator() {
            Scanner scanner = new Scanner(System.in);
            lineCount = scanner.nextInt();
    
            points = new Point[lineCount];
    
            System.out.println("----------------------");
            System.out.println("enter points for first line: ");
            points[0] = pointFiller(scanner);
    
            for (int i = 1; i < lineCount; i++){
                System.out.println("----------------------");
                System.out.println("enter points for next line:");
                points[i] = pointFiller(scanner);
            }
    
            System.out.println("----------------------");
            System.out.println(Arrays.toString(points));
        }
    
        public static Point pointFiller(Scanner scanner) {
            System.out.print("     - enter x: ");
            int x = scanner.nextInt();
    
            System.out.print("     - enter y: ");
            int y = scanner.nextInt();
    
            return new Point(x, y);
        }
    
        @Override
        public String toString() {
            return "Points for line {x = " + x + ", y = " + y + '}';
        }
    }
    
    • 3
  2. Nofate
    2020-10-21T00:32:35Z2020-10-21T00:32:35Z
    Point[] points = new Point[lineCount];
    

    执行此行时,lineCount == 0. 在那之后,你在逻辑上离开了数组,因为 该数组的长度为零。

    lineCount从控制台获取值后初始化数组。

    • 2

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