boolean function ( ) { return this . size == 0 ; }
returns true if the stack is empty , and false otherwise . concode_field_sep int size concode_elem_sep Object[] contents concode_elem_sep int initialSize concode_field_sep Object pop concode_elem_sep int size concode_elem_sep Object get concode_elem_sep Object clone concode_elem_sep void clear concode_elem_sep void push concode_elem_sep Object peek