/**
 * 
 * @author VK
 * @Date 2016-12-19 10:48
 * @Decribe 題目：給定一個整數型一維陣列，去除重複元素形成新陣列，
 * 並返回新陣列長度。不額外分配陣列空間
 *
 */
public class Demo {

    public static void main(String[] args) {

        int[] src = { 0, 1, 1, 1, 1, 2, 3, 4, 4, 5, 6, 7, 8, 8, 9, 9, 9 };

        print(src,src.length);
        System.out.println("\n========== after calculate ==========\n"
 
);
        int len = calculate(src);
        print(src,len);
    }

    public static int calculate(int[] src) {

        if (src == null || src.length == 0)
            return 0;

        int ret = 0;
        int count = 0;
        int index = 1;// 新陣列的下標索引
        int tmp = src[0];
        for (int i = 1
 
; i < src.length; i++) {
            // 1.前後元素若相同 count++
            if (tmp == src[i]) {
                count++;
            } else {// 2.若不相同，count>0表示前面有重複值，需要進行去重位移
                tmp = src[i];
                if (count > 0) {
                    src[index] = src[i];
                }
                index++;
            }
        }
        ret = index;
        System.out.println("The number of removed elements ="
 
 + count);// 列印移除重複次數

        return ret;
    }

    public static void print(int[] src,int len){
        StringBuffer mBuffer = new StringBuffer();
        mBuffer.append("len=");
        mBuffer.append(len);
        mBuffer.append('\n');

        for (int i = 0; i < len; i++) {
            mBuffer.append(src[i]);
            mBuffer.append('\0');
        }
        System.out.println(mBuffer.toString());
    }
}

計算結果：