Вы можете попробовать это:
int[][] ints = new int[4][4]; // Let's say you have a 4 * 4 ints array filled like this
ints[0][0] = 1;
ints[0][1] = 2;
ints[0][2] = 3;
ints[0][3] = 4;
ints[1][0] = 5;
ints[1][1] = 6;
ints[1][2] = 7;
ints[1][3] = 8;
ints[2][0] = 9;
ints[2][1] = 10;
ints[2][2] = 11;
ints[2][3] = 12;
ints[3][0] = 13;
ints[3][1] = 14;
ints[3][2] = 15;
ints[3][3] = 16;
StringBuilder sb = new StringBuilder(); // String Builder to create the table structure before writing it to the file.
for (int[] int1 : ints) {
for (int j = 0; j < int1.length; j++) {
sb.append(int1[j]).append("\t"); // Add tab to delimite the elements
}
sb.append("\r\n"); // Add new line character
}
System.out.println(sb);
Path path = Paths.get("C:\\Users\\youruser\\Documents\\test.txt"); // The path to your file
Files.write(path, sb.toString().getBytes()); // Writes to that path the bytes in the string from the stringBuilder object.
Это выведет значения в виде таблицы:
![enter image description here](https://i.stack.imgur.com/nOuqw.png)