Convert String to array 2 D in java

Question

I have this String is a result from query 07:40,09:00,10:20,11:40,|08:00,09:00,|

1) i want to eliminate the last ,|

2) convert it to

String[][] matrix ={
    {"07:40","08:00"},
    {"09:00","09:00"},
    {"10:20",null},
    {"11:40",null}
};

Is that fixed format i.e. columns seperated by pipe i.e. "|"? — SMA
– SMA, Commented Dec 26, 2014 at 17:09
no is a variable Strin from a result of Query, yes i separat the column by pipe — hakim el massari
– hakim el massari, Commented Dec 26, 2014 at 17:11
Will it always be 6 variables? Does order matter? Will the pipeline characters be fixed? There isn't enough info here to help — But I'm Not A Wrapper Class
– But I'm Not A Wrapper Class, Commented Dec 26, 2014 at 17:28

luksch · Accepted Answer · 2014-12-26 17:19:20Z

3

I would:

1) elimitate the last ",|" using e.g. substring()

2) split the string with string.split("|"), and keep the length as numTimes

3) cycle over the split result and split each substring by substr.split(",")

4) keep the maximum length of the length of the splits in an int called len

5) create the result array String[][] matrix = new String[len][numTimes]

5) create a for loop for (int i = 0; i < len; i++){...

6) within the loop add the correct values into matrix (check for null)

answered Dec 26, 2014 at 17:19

luksch

11.7k6 gold badges41 silver badges54 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

newcoder Over a year ago

Upvoted for explaining the necessary steps of the process so succinctly

Ali Akber · Accepted Answer · 2014-12-26 17:09:32Z

1

If you are using C++ then you can try this :

#include <bits/stdc++.h>
using namespace std;

vector<string>split(string str,string Separator)
{
    vector<string>answer;string temp;
    int len=str.size();
    for(int i=0;i<len;i++)
    {
        bool isSeparator=false;
        for(int j=0;j<Separator.length();j++)
          if(str[i]==Separator[j])
            isSeparator=true;
        if(!isSeparator)
        {
            temp+=str[i];continue;
        }
        if(temp!="")
          answer.push_back(temp);temp="";
    }
    if(temp!="")
      answer.push_back(temp);
    return answer;
}
int main()
{
    int i,j;
    string str="07:40,09:00,10:20,11:40,|08:00,09:00,|";
    vector<string>v=split(str,"|"); // First split with respect to '|'
    vector<string>matrix[100]; // Maximum row of time
    for(i=0;i<v.size();i++)
    {
        vector<string>temp;
        temp=split(v[i],","); // Now split with respect to ','
        for(j=0;j<temp.size();j++)
        {
            matrix[j].push_back(temp[j]);
        }
    }
    for(i=0;;i++)
    {
        if(matrix[i].size()==0) // Break the loop, because no time will be on below
          break;
        for(j=0;j<matrix[i].size();j++)
          cout<<matrix[i][j]<<" ";
        cout<<"\n";
    }
return 0;
}

answered Dec 26, 2014 at 17:09

Ali Akber

3,8103 gold badges28 silver badges41 bronze badges

4 Comments

SMA Over a year ago

Thanks but OP needs answer for java.

Ali Akber Over a year ago

@almasshaikh it was not stated at first :(

hakim el massari Over a year ago

tanks but i m using java

SMA Over a year ago

@AliAkber I know and i did asked OP to add. Really appreciate you helping OP.

SMA · Accepted Answer · 2014-12-26 17:26:32Z

1

Try this:

public static void main(String ars[]) {
String string = "11:40,|08:00,09:00,|";
String[] str1 = string.split("\\|");
if (str1.length != 2) {
  throw new IllegalArgumentException("I dont see a seperator | in your String");
}
String[] rows = str1[0].split(",");
String[] cols = str1[1].split(",");
int maxLength = rows.length > cols.length ? rows.length : cols.length;
String matrix[][] = new String[maxLength][2];

for (int row=0; row<rows.length; row++) {
  matrix[row][0] = rows[row];
}
for (int col=0; col<cols.length; col++) {
  matrix[col][1] = cols[col];
}

for (int i=0; i<maxLength; i++) {
  System.out.println(Arrays.toString(matrix[i]));
}
}

answered Dec 26, 2014 at 17:26

SMA

37.2k8 gold badges53 silver badges76 bronze badges

4 Comments

But I'm Not A Wrapper Class Over a year ago

I don't think writing all of OP's code out is a good way for OP to learn :/

SMA Over a year ago

No i agree with you @CyberneticTwerkGuruOrc. But am hoping he is going to get familiar with API's in JAVA and learn them so next time he is going to use those.

hakim el massari Over a year ago

but if i have String string = "11:40,|08:00,09:00,|08:00,09:00"; it should be dynamic

hakim el massari Over a year ago

@almasshaikh help me plz

Mohammed Housseyn Taleb · Accepted Answer · 2014-12-26 20:50:29Z

hi try this solution it works and not only in a perfect way but it take care of null strings ans malformed strings enjoy

             public static String[][] getModel(String answer){
     try {
         System.out.println(answer);
             if(answer.contains("|")){
                            String[] cols=answer.split(",\\|");

                            System.out.println("case found");
                            System.out.println("size 1:"+cols.length);

                            int dimensionCol=cols.length;
                            int dimensionRow=cols[0].split(",").length;

                            System.out.println(dimensionCol+" "+dimensionRow);
                            String[][] result=new String[dimensionRow][dimensionCol];

                            int i=0,j=0;
                            for(String colElement:cols){
                                i=0;
                                String[] datas = colElement.split(",");
                                for (String data : datas) {
                                    result[i][j]=(!data.equals(""))?data:null;
                                    System.out.print(result[i][j]);
                                    i++;
                                }
                                System.out.println("");
                                j++;
                                         }
                            return result;
                           }else{


                                  System.out.println("empty String return by null");
                                  return null;


                           }
          }catch(Exception e){e.printStackTrace();}
     return null;
   }

here is the main test methode

   public static void main(String[] args) {


   // String model = "07:40,09:00,10:20,11:40,|08:00,09:00,|";
    String model = "";
    String[][] model1 = getModel(model);
          if (model1!=null) {
        for (String[] model11 : model1) {
              for (String model111 : model11) {
                  System.out.print(model111+" ");
              }
              System.out.println("");

    }
    }

}

Collectives™ on Stack Overflow

Convert String to array 2 D in java

4 Answers 4

1 Comment

4 Comments

4 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

1 Comment

4 Comments

4 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related