ch6_e6_20.java

此上传文件是JAVA一书中的第6章的部分代码,希望对大家有用.

public class ch6_e6_20 
{
    public static void main(String args[])
    {
        RecursionExample sample = new RecursionExample();
        
        System.out.println("数组元素：\n"
            + sample.toString());
        System.out.println("数组元素的乘积：" 
            + sample.multipleArray());
    }
}

class RecursionExample
{
    int DataArray[] = {1,2,3,4,5,6,7,8,9};
    
    long multipleArray()
    {
        return multipleOneStep(DataArray,DataArray.length-1);
    }
    
    long multipleOneStep(int[] array, int index)
    {
        if(index == 0)
            return array[index];
        else
            return multipleOneStep(array,index-1) * array[index];
    }
    
    public String toString()
    {
        String s = "";
        
        for(int i=0; i<DataArray.length; i++)
        {
            s = s + DataArray[i] + "\t";
        }
        
        return s;
    }

}