java - 矩阵操作Java

Question

假设我有下一个二维 int 数组:

  int [][] mat = {{1 1 1 1 1}, 
                  {0 0 0 0 0}, 
                  {3 3 3 3 3}, 
                  {0 0 0 0 0}, 
                  {2 2 2 2 2}};

我在这里的原因是因为我试图想出一种方法来按下一个顺序对行进行洗牌(而不丢失第一行数据):

   first row data -> second row 
   second row data -> third row
   third row data -> fourth row
   fourth row data -> fifth row

对我所写内容的更详细的图形解释:

    original: 1 1 1 1 1      what i need: 1 1 1 1 1 
              0 0 0 0 0                   1 1 1 1 1 <- first row data on the second row
              3 3 3 3 3                   0 0 0 0 0 <- second row data on the third row
              0 0 0 0 0                   3 3 3 3 3 <- third row data on the fourth row
              2 2 2 2 2                   0 0 0 0 0 <- fourth row data on the fifth row

     meaning that the 1st row always remains constant 
     and that the original fifth row always loses its content

任何关于我如何实现这样的事情的建议/提示将不胜感激!

Answer 1

从最后一行向后迭代到第二行。

对于每一行，将前一行的值分配给它。