e121. getting the length and dimensions of an array object.txt

这里面包含了一百多个JAVA源文件

The length of an array is the number of elements of the array. The dimensions of an array type of int[][][] is three. 
    Object o = new int[1][2][3];
    
    // Get length
    int len = Array.getLength(o);  // 1
    
    // Get dimension
    int dim = getDim(o);           // 3
    
    // If `array' is an array object returns its dimensions; otherwise returns 0
    public static int getDim(Object array) {
        int dim = 0;
        Class cls = array.getClass();
        while (cls.isArray()) {
            dim++;
            cls = cls.getComponentType();
        }
        return dim;
    }