This code should print the values you want:
final int[] values = {1, 2, 3, 4};
for (int size = 2; size < values.length; size++) {
for (int i = 0; i + size <= values.length; i++) {
for (int j = 0; j <= size - 1; j++) {
System.out.print(values[i + j]);
}
System.out.println();
}
}
From the example, we see that you want to print sets of values whose length is greater than 1 and smaller than the total set, so that 's what the following line does:
for (int size = 2; size < values.length; size++) {
After that we compute the starting index of the subset, watching not to run into a IndexArrayOutOfBounds exception (see the line below)
for (int i = 0; i + size <= values.length; i++) {
From there we just print the values starting at i index and with the subset length of size
for (int j = 0; j <= size - 1; j++)