public void ensureCapacity ( int capacity ) { if ( capacity > data . length ) { int newCap = Math . max ( data . length << 1 , capacity ) ; int [ ] tmp = new int [ newCap ] ; System . arraycopy ( data , 0 , tmp , 0 , data . length ) ; data = tmp ; } }
Increases the capacity if necessary to ensure that it can hold at least the number of values specified by the minimum capacity argument .