byte stack

byte stack，实现了一个byte栈，该栈的数据从索引“0”开始弹出，每次可以弹出若干个byte。

public class ByteStack { private byte[] element; private int size; public ByteStack(byte[] element) { if (element == null) { throw new IllegalArgumentException("null element."); } this.element = element; this.size = element.length; } public byte peek() { if (size == 0) throw new EmptyStackException(); return element[0]; } public byte[] peek(int count) { if (size < count) throw new IllegalArgumentException("count is too large."); return Arrays.copyOf(element, count); } public byte pop() { byte b = peek(); removeElementAt(0); return b; } public byte[] pop(int count) { byte[] result = peek(count); removeElementOfRange(0, count); return result; } private void removeElementOfRange(int from, int to) { if (to > size) { throw new ArrayIndexOutOfBoundsException(to + " >= " + size); } else if (from < 0) { throw new ArrayIndexOutOfBoundsException(from); } else if (from >= to) { throw new IllegalArgumentException(from + " > " + to); } System.arraycopy(element, to, element, from, size - to); size -= to; } private void removeElementAt(int index) { if (index >= size) { throw new ArrayIndexOutOfBoundsException(index + " >= " + size); } else if (index < 0) { throw new ArrayIndexOutOfBoundsException(index); } int j = size - index - 1; if (j > 0) { System.arraycopy(element, index + 1, element, index, j); } size--; } public int size() { return size; } }