Java Utililty Methods Array Sub Array

List of utility methods to do Array Sub Array

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Description

The list of methods to do Array Sub Array are organized into topic(s).

Method

String[]sub(String[] a, String[] b)
subtract b from a 
TreeSet<String> s = new TreeSet<>(Arrays.asList(a));
s.removeAll(Arrays.asList(b));
if (s.size() != a.length) {
    return s.toArray(new String[s.size()]);
} else {
    return a;
Listsub(T[] source, int first, int last)
sub 
if (first < 0 || last < 0 || first >= source.length || last >= source.length)
    throw new ArrayIndexOutOfBoundsException();
List<T> result = new ArrayList<T>();
for (int i = first; i <= last; i++)
    result.add(source[i]);
return result;
boolean[]subarray(boolean[] array, int fromIndex, int length)
Building on the arraycopy function in System, this function returns a "subarray" of a larger array. 
boolean[] tempArray = new boolean[length];
try {
    System.arraycopy(array, fromIndex, tempArray, 0, tempArray.length);
} catch (ArrayIndexOutOfBoundsException e) {
    System.out.println("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
    System.out.println("Array of length:" + array.length);
    System.out.println("From index with length:" + fromIndex + "," + length);
    System.out.println("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
...
byte[]subArray(byte[] a, int beginIndex, int endIndex)
Returns the new array that is the sub-array of the specified array . 
if (a == null || a.length == 0 || beginIndex < 0 || endIndex > a.length || beginIndex > endIndex) {
    return new byte[0];
} else {
    byte[] b = new byte[endIndex - beginIndex];
    System.arraycopy(a, beginIndex, b, 0, b.length);
    return b;
byte[]subArray(byte[] array, int beginIndex, int endIndex)
Extract a sub array of bytes out of the byte array. 
int length = endIndex - beginIndex;
byte[] subarray = new byte[length];
System.arraycopy(array, beginIndex, subarray, 0, length);
return subarray;
byte[]subarray(byte[] array, int offset, int length)
NOTE: subarray method implemented for arrays of type byte Extracts a sub array from an array of a primitive type. 
validateOffsetLength(array, array.length, offset, length);
byte[] sub = new byte[length];
for (int i = 0; i < length; i++)
    sub[i] = array[offset + i];
return sub;
byte[]subarray(byte[] array, int startIndexInclusive, int endIndexExclusive)

Produces a new byte array containing the elements between the start and end indices.

The start index is inclusive, the end index exclusive. 

if (array == null) {
    return null;
if (startIndexInclusive < 0) {
    startIndexInclusive = 0;
if (endIndexExclusive > array.length) {
    endIndexExclusive = array.length;
...
byte[]subarray(byte[] array, int startIndexInclusive, int endIndexExclusive)
subarray 
if (array == null) {
    return null;
if (startIndexInclusive < 0) {
    startIndexInclusive = 0;
if (endIndexExclusive > array.length) {
    endIndexExclusive = array.length;
...
byte[]subArray(byte[] b, int offset, int length)
Return a subarray of the byte array in parameter. 
byte[] sub = new byte[length];
for (int i = offset; i < offset + length; i++)
    sub[i - offset] = b[i];
return sub;
byte[]subarray(byte[] b, int ofs, int len)
subarray 
byte[] out = new byte[len];
System.arraycopy(b, ofs, out, 0, len);
return out;