java 循环数组

public class LoopArray {
        float[] arr;
        int startIndex, len;

        public LoopArray(int size) {
            arr = initArray(size);
        }

        private float[] initArray(int size){
            return new float[size];
        }
        
        public int getIndex() {
            return startIndex;
        }

        public float[] getArray() {
            return arr;
        }

        public int getLength() {
            return len;
        }

        public void put(float value) {
            arr[(startIndex + len) % arr.length] = value;
            if (len < arr.length)
                len++;
            else {
                startIndex = (startIndex + 1) % arr.length;
            }
        }

        public float[] get() {
            float[] data = initArray(len);
            for (int i = 0; i < data.length; i++) {
                data[i] = arr[(i + startIndex) % arr.length];
            }
            return data;
        }
    }