Java的基本整數數組

Question

我想不通爲什麼我的結局是不是：

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

（預期輸出）

我的代碼：

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]); 
    } 
} 

結果/實際輸出：

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

異常在線程 「主」 java.lang.ArrayIndexOutOfBoundsException：7 在day7.main（day7.java:14）

Answer 1

剛剛切換線之間我++和的System.out.println（arrayZ [I] ）;

如果你想計算總和，只需將它們添加到一個新的變量或使用（）;

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 2

改成這樣：

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

因爲你使用它的方式，它會嘗試打印arrayZ [7]，即不存在。

Answer 3

您的密碼正確無誤，問題依次爲incrementing和printing。

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])); 
} 

還需要先總結中的項目，需要使用括號，然後使用+與String將其他變量轉換爲String，並會顯示連接後的結果。輸出是：

你的第一個數組元素是：0
陣列的每個條目是：0 1 2 3 4 5 6
而且，所有陣列元素的總和爲：21

如果你h你的循環計數器的大小固定邊界（在你的情況下，他們是1到6），那麼最好使用for循環。

Answer 4

• 只是切換i ++和System.out之間的界限。的println（arrayZ [I]）;

• 如果您想計算總和，只需將它們添加到一個新變量中或使用（）;

  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])); 
  

  } while循環代碼

Answer 5

變化如下

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