Java基本整数数组

Question

我不知道为什么我的结果不是：

Your first array element is: 0
1
2
3
4
5
6

（预期输出）

我的代码：

public class day7 {
    public static void main(String[] args){
        int arrayZ[] = new int[7];

        arrayZ[0] = 0;
        System.out.println("Your first array element is: " + arrayZ[0]);

        int i = 1;
        while (i <= 6){
            arrayZ[i] = i;
            i++;
        System.out.println(arrayZ[i]);
        }
    System.out.println("Each entry of the array is: " + arrayZ[0] + " " + arrayZ[1] + " " + arrayZ[2] + " " + arrayZ[3] + " " + arrayZ[4] + " " + arrayZ[5] + " " + arrayZ[6]);
    System.out.println("And, the sum of all array elements are: " + arrayZ[0] + arrayZ[1] + arrayZ[2] + arrayZ[3] + arrayZ[4] + arrayZ[5] + arrayZ[6]);
    }
}

成果/实际产出：

Your first array element is: 0
0
0
0
0
0

线程“主”中的异常java.lang.ArrayIndexOutOfBoundsException：在day7.main处为7（day7.java:14）

Answer 1

您的代码是正确的，唯一的问题是按照incrementing和printing顺序进行。

public static void main(String[] args) {
    int arrayZ[] = new int[7];

    arrayZ[0] = 0;
    System.out.println("Your first array element is: " + arrayZ[0]);

    int i = 1;
    while (i <= 6)  {
        arrayZ[i] = i;
        System.out.println(arrayZ[i]);
        i++;
    }
    System.out.println("Each entry of the array is: " + arrayZ[0] + " " + arrayZ[1] + " " + arrayZ[2] + " " + arrayZ[3] + " " + arrayZ[4] + " " + arrayZ[5] + " " + arrayZ[6]);
    System.out.println("And, the sum of all array elements are: " + (arrayZ[0] + arrayZ[1] + arrayZ[2] + arrayZ[3] + arrayZ[4] + arrayZ[5] + arrayZ[6]));
}

另外，您需要首先对各项求和，因此需要使用方括号，然后对String使用+会将其他变量转换为String ，并显示并置结果。 输出为：

您的第一个数组元素是：0
1个
2
3
4
5
6
数组的每个条目是：0 1 2 3 4 5 6
并且，所有数组元素的总和为：21

如果您的循环计数器具有固定范围（在您的情况下为1到6），则最好使用for循环。

Answer 2

只需在i ++和System.out.println（arrayZ [i]）之间切换即可；

如果要计算总和，只需将它们添加到新变量中或使用（）;

public static void main(String[] args) {
    int arrayZ[] = new int[7];

    arrayZ[0] = 0;
    System.out.println("Your first array element is: " + arrayZ[0]);

    int i = 1;
    while (i <= 6) {
        arrayZ[i] = i;
        System.out.println(arrayZ[i]);
        i++;
    }
    System.out.println("Each entry of the array is: " + arrayZ[0] + " " + arrayZ[1] + " " + arrayZ[2] + " " + arrayZ[3] + " " + arrayZ[4] + " " + arrayZ[5] + " " + arrayZ[6]);
    System.out.println("And, the sum of all array elements are: " + (arrayZ[0] + arrayZ[1] + arrayZ[2] + arrayZ[3] + arrayZ[4] + arrayZ[5] + arrayZ[6]));
}

Answer 3

更改为此：

while (i <= 6){
    arrayZ[i] = i;
    System.out.println(arrayZ[i]);
    i++;
}

因为您使用它的方式，它会尝试打印不存在的arrayZ [7]。

Answer 4

• 只需在i ++和System.out.println（arrayZ [i]）之间切换即可；

• 如果要计算总和，只需将它们添加到新变量中或使用（）;

   public static void main(String[] args) { int arrayZ[] = new int[7]; arrayZ[0] = 0; System.out.println("Your first array element is: " + arrayZ[0]); int i = 1; while (i <= 6) { arrayZ[i] = i; System.out.println(arrayZ[i]); i++; } System.out.println("Each entry of the array is: " + arrayZ[0] + " " + arrayZ[1] + " " + arrayZ[2] + " " + arrayZ[3] + " " + arrayZ[4] + " " + arrayZ[5] + " " + arrayZ[6]); System.out.println("And, the sum of all array elements are: " + (arrayZ[0] + arrayZ[1] + arrayZ[2] + arrayZ[3] + arrayZ[4] + arrayZ[5] + arrayZ[6])); 

  }

Answer 5

如下更改while循环代码

while (i <= 6){
    arrayZ[i] = i;
    System.out.println(arrayZ[i]);
    i++;
}