Why i can't sum an ArrayList Integer colum?-CodePudding

I'm new to java and I can't figure it out, any tips?

I'm trying to sum all this numbers

like 719488 4093600 4096453 4096453 4096453 = Something

The result I'm getting is:

Basically is multiplicating by 2 each number in each line by its own value.

Please, I need help. Thank you

adding more info:

String strHDD = "df -i\n"  
        "Filesystem                    Inodes  IUsed    IFree IUse% Mounted on\n"  
        "/dev/mapper/vg0-rootvol       719488  42967   676521    6% /\n"  
        "devtmpfs                     4093600    436  4093164    1% /dev\n"  
        "tmpfs                        4096453      1  4096452    1% /dev/shm\n"  
        "tmpfs                        4096453   1384  4095069    1% /run\n"  
        "tmpfs                        4096453     16  4096437    1% /sys/fs/cgroup\n"  
        "/dev/sda1                      32768    351    32417    2% /boot\n"  
        "/dev/mapper/vg0-optvol        327680  19465   308215    6% /opt\n"  
        "/dev/mapper/vg0-homevol       131072    322   130750    1% /home\n"  
        "/dev/mapper/vg0-tmpvol        131072    166   130906    1% /tmp\n"  
        "/dev/mapper/vg0-varvol        327680   4486   323194    2% /var\n"  
        "/dev/mapper/vg0-logvol        131072    163   130909    1% /var/log\n"  
        "/dev/mapper/vg0-auditvol      327680     34   327646    1% /var/log/audit\n"  
        "/dev/mapper/vg1-optSPvol    32768000 156936 32611064    1% /opt/SP\n"  
        "/dev/mapper/vg0-varcrashvol  1048576     11  1048565    1% /var/crash\n"  
        "tmpfs                        4096453      1  4096452    1% /run/user/10603\n"  
        "[1;31mvg1108yr:resolve:[0m/opt/SP/resolve \$"

      String strRegex = "(\\d )\\s (\\d \\s (\\d )(?=\\s \\d \\%))"
      Pattern pattern = Pattern.compile(strRegex);
      Matcher matcher = pattern.matcher(strHDD);
      while (matcher.find()) {

    String[] stringArray = matcher.group().split("\\s ")

          List<String> list = Arrays.asList(stringArray)

          List<Integer> newList = list.stream()
                  .map(s -> Integer.parseInt(s))
                  .collect(Collectors.toList());


          int [][] num = newList

          int columTotal = 0

          for (int i = 0; i < num.length; i  ){
              columTotal  = num[i][0]
          }
          println(newList)



}

output:

[719488, 42967, 676521]
[4093600, 436, 4093164]
[4096453, 1, 4096452]
[4096453, 1384, 4095069]
[4096453, 16, 4096437]
[32768, 351, 32417]
[327680, 19465, 308215]
[131072, 322, 130750]
[131072, 166, 130906]
[327680, 4486, 323194]
[131072, 163, 130909]
[327680, 34, 327646]
[32768000, 156936, 32611064]
[1048576, 11, 1048565]
[4096453, 1, 4096452]

Process finished with exit code 0

or:

int columTotal = 0

          for (int i = 0; i < num.length; i  ){
              columTotal  = num[i][0]
          }
          println(columTotal)

1438976
8187200
8192906
8192906
8192906
65536
655360
262144
262144
655360
262144
655360
65536000
2097152
8192906

Process finished with exit code 0

But it never sums only multiply by two

CodePudding user response：

In your String Inodes = IUsed IFree. When you find with the matcher one by one in each iteration all 3 values Inodes, IUsed, IFree are getting picked up. So each iteration is printing Inodes IUsed IFree. That's why you are getting double values here.

So your code should be like this:

public static void main(String[] args) throws JSONException {
    String strHDD = "df -i\n"   "Filesystem                    Inodes  IUsed    IFree IUse% Mounted on\n"
          "/dev/mapper/vg0-rootvol       719488  42967   676521    6% /\n"
          "devtmpfs                     4093600    436  4093164    1% /dev\n"
          "tmpfs                        4096453      1  4096452    1% /dev/shm\n"
          "tmpfs                        4096453   1384  4095069    1% /run\n"
          "tmpfs                        4096453     16  4096437    1% /sys/fs/cgroup\n"
          "/dev/sda1                      32768    351    32417    2% /boot\n"
          "/dev/mapper/vg0-optvol        327680  19465   308215    6% /opt\n"
          "/dev/mapper/vg0-homevol       131072    322   130750    1% /home\n"
          "/dev/mapper/vg0-tmpvol        131072    166   130906    1% /tmp\n"
          "/dev/mapper/vg0-varvol        327680   4486   323194    2% /var\n"
          "/dev/mapper/vg0-logvol        131072    163   130909    1% /var/log\n"
          "/dev/mapper/vg0-auditvol      327680     34   327646    1% /var/log/audit\n"
          "/dev/mapper/vg1-optSPvol    32768000 156936 32611064    1% /opt/SP\n"
          "/dev/mapper/vg0-varcrashvol  1048576     11  1048565    1% /var/crash\n"
          "tmpfs                        4096453      1  4096452    1% /run/user/10603\n";

    String strRegex = "(\\d )\\s (\\d \\s (\\d )(?=\\s \\d \\%))";
    Pattern pattern = Pattern.compile(strRegex);
    Matcher matcher = pattern.matcher(strHDD);
    int columTotal = 0;
    while (matcher.find()) {

      String[] stringArray = matcher.group().split("\\s ");

      List<String> list = Arrays.asList(stringArray);

      List<Integer> newList = list.stream().map(s -> Integer.parseInt(s)).collect(Collectors.toList());

      columTotal  = newList.get(0);
      System.out.println("Value to add : "   newList.get(0));
      
    }
    System.out.println("Total : "   columTotal);
  }

Result:

Value to add : 719488
Value to add : 4093600
Value to add : 4096453
Value to add : 4096453
Value to add : 4096453
Value to add : 32768
Value to add : 327680
Value to add : 131072
Value to add : 131072
Value to add : 327680
Value to add : 131072
Value to add : 327680
Value to add : 32768000
Value to add : 1048576
Value to add : 4096453
Total : 56424500