How to optimize the output form of arrays in java

One-dimensional array:

Define an array:

int[] array = { 1, 2, 3, 4, 5 };

(1) Traditional for loop method, sample code 1:

for (int i = 0; i < array.length; i++) {
System.out.println(array[i]);
}

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Output result:

(2) for each loop, sample code 2:

for (int a : array) {
System.out.println(a);
}

Output result:

(3) Using Arrays toString method in the class, sample code 3:

System.out.println(array);// 这样打印的是数组的首地址。
System.out.println(Arrays.toString(array));

Output result:

Two-dimensional array:

These three methods also correspond to two-dimensional arrays. Define a two-dimensional array:

int[][] arrays = { { 16, 3, 2, 13 }, { 5, 10, 11, 8 }, { 9, 6, 7, 3 } };

Java actually does not have multi-dimensional arrays, only one-dimensional arrays. Multi-dimensional arrays are interpreted as "Array of arrays", for example, the two-dimensional array arrays is a one-dimensional array containing three elements {arrays[0], arrays[1], arrays[2]}, arrays[0] is a one-dimensional array containing {16,3,2, 13} A one-dimensional array of four elements, the same goes for arrays[1] and arrays[2].

(1) Traditional for loop method, sample code 1:

for (int i = 0; i < arrays.length; i++) {
for (int j = 0; j < arrays[i].length; j++) {
System.out.print(arrays[i][j] + " ");
}
System.out.println(); // 换行
}

Output result:

(2) for each loop , Sample code 2:

for (int[] a : arrays) {
for (int b : a) {
System.out.print(b + " ");
}
System.out.println();// 换行
}

Output result:

(3) Use the toString method in the Arrays class, Sample code 3:

for (int i = 0; i < arrays.length; i++) {
System.out.println(Arrays.toString(arrays[i]));
}

Output results:

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