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;
        }
    }
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.

@param capacity the desired minimum capacity.