找不到合适的克隆方法（元组）

Question

我需要帮助调试我的程序ChangeMaker。

    public class ChangeMaker {

/**
 * Constructor for objects of class ChangeMaker
 */
public static void main ( String[] args ) {
        for(int x = 1; x < coins; x++) {
        int coin = Integer.parseInt(args[x + 1]);

        for (int i = 1; i <= quantity; i++) {
            Tuple tuple = table[x][i];
            int amount = i;
            int leftover = amount % coin;
            int coinTotal= (int)Math.floor(amount / coin);

            if (leftover == 0) { 

                tuple.setElement(x, coinTotal);
                int bestRow = optimalCheck(table, tuple, x, i);

                Tuple bestTuple = table[bestRow][i];

                tuple.clone(bestTuple);


            } else if (leftover != 0 && amount < coin) { 

                tuple.clone(table[x - 1][i]);

            } else if (leftover != 0 && amount > coin) { 

                tuple.setElement(x, coinTotal);
                Tuple leftoverTuple = table[x][leftover];
                tuple.add(leftoverTuple);

                int bestRow = optimalCheck(table, tuple, x, i);
                Tuple bestTuple = table[bestRow][i];
                tuple.clone(bestTuple);
            }
        }
    }

每次我尝试调用.clone（）方法时，都会出现错误，说java.lang.Object.clone方法不适用（实际和形式参数列表的长度不同）。方法Tuple.clone（）不适用。但是，当我注释掉克隆方法时，每个其他方法都可以工作，例如.add（）和.setElement（）。

这是克隆方法：

public class Tuple
{
private  int[] tupleArray;
private int tupleLength;

    public Tuple clone () {
    Tuple copy = new Tuple(this.tupleLength);
    for(int i=0; i<this.tupleLength; i++) {
        copy.tupleArray[i]=this.getElement(i);
    }
    return copy;
}