java-循环超出数组长度范围时,越界异常

因此,该程序应该根据用户输入在3到11的大小之间生成一个奇数大小的数组,然后在特定位置用一个字符填充该板上以获取图案.一切都进行得很好,直到我尝试返回的数组给了我2个超出范围的异常,即使我将循环设置为小于尺寸.我在这里以5为例,尝试得到5 x 5的数组.这是主要的.

public static void main (String [] args) {

    int dimension = findDimension();
    char [] [] array2d = new char [dimension] [dimension];

    char star = '*';

    array2d = leftDiagonal(star,dimension); // Get out of bounds here
    print(array2d); 
} 

要求用户输入“ findDimension()”的方法

public static int findDimension() {
    int dimension = 0;
    Scanner keybd = new Scanner(System.in); 
    do {
        System.out.print("Enter an odd integer between 3 and 11 please: ");
        dimension = keybd.nextInt();
    } while (dimension%2 == 0);
    return dimension;            // Everything seems fine here,no errors
}

打印数组的方法

public static void print(char [] [] arrayParam) {
    System.out.println("-----------");
    System.out.println(arrayParam);
    System.out.println("-----------");
}

设置模式“ leftDiagonal”的方法

public static char [] [] leftDiagonal(char starParam,int dimenParam) {
    char [] [] leftD = new char [dimenParam] [dimenParam];
    for (int i = 0; i < dimenParam; i++){ 
        for (int j = 0; i < dimenParam; j++) {
            leftD [i][j] = starParam;  // Gets error here
        }
    }
    return leftD;
}

输出应为

-----------                             
 * * * * *
 * * * * *
 * * * * *
 * * * * *
 * * * * *
----------- 

从技术上讲应该是

 -----------                             
  *    
    *   
      *  
        * 
          *
 -----------  

但此刻我只想获取任何输出.我本来打算用空格”填充所有空格,然后用字符填充我需要的空格,但是我什至无法使数组先打印出来.谢谢任何愿意提供帮助的人.

最佳答案

由于内部循环条件而发生错误.

public static char[][] leftDiagonal(char starParam,int dimenParam) {
    char[][] leftD = new char[dimenParam][dimenParam];
    for (int i = 0; i < dimenParam; i++) {
        for (int j = 0; j < dimenParam; j++) { // i -> j
            leftD[i][j] = starParam;  // Gets error here
        }
    }
    return leftD;
}

有很多方法可以解决问题.
您可以只打印数组而不初始化它.

public static char[][] leftDiagonal(char starParam,int dimenParam) {
    char[][] leftD = new char[dimenParam][dimenParam];
    for (int i = 0; i < dimenParam; i++) {
        for (int j = 0; j < dimenParam; j++) {
            if(i==j) {
                System.out.print(starParam);
            } else {
                System.out.print("  ");
            }
        }
        System.out.println();
    }
    return leftD;
}