小编Tap*_*psi的帖子

有ArrayList没有循环的总和的可能性？

PHP提供的sum(array)将给出数组的总和.

PHP代码就像

$a = array(2, 4, 6, 8);
echo "sum(a) = " . array_sum($a) . "\n";

我想在Java中做同样的事情:

List tt = new ArrayList();
tt.add(1);
tt.add(2);
tt.add(3);

我是Java新手.我有一个文本文件,内容如下.

`trace` -
structure(
 list(
  "a" = structure(c(0.748701,0.243802,0.227221,0.752231,0.261118,0.263976,1.19737,0.22047,0.222584,0.835411)),
  "b" = structure(c(1.4019,0.486955,-0.127144,0.642778,0.379787,-0.105249,1.0063,0.613083,-0.165703,0.695775))
 )
)
  

现在我想要的是,我需要将"a"和"b"作为两个不同的数组列表.