How can I convert a Two D string array to One D string array? [duplicate]

Question

I have a two dimensional string array:

String myTwoD[][] = {{"Apple", "Banana"}, {"Pork", "Beef"}, {"red", 
"green","blue","yellow"}};

How do I convert this to a one dimensional string array as follows in JAVA:

OneD[]={"Apple", "Banana","Pork", "Beef","red", "green","blue","yellow"};

Can ArrayUtils be used for this?

Here is the code for my array, I am trying to store all values in a multipage table column to an array for sorting

for (i=0;i<pagecount; i++)
  {
  for (j=0;j<columncount;j++)
   {
    array[i][j]= t.getcolumnname().get(j).getText();
   }
  }

Arrays.stream(myTwoD).flatMap(Arrays::stream).toArray(String[]::new) — shmosel
– shmosel, Commented Nov 2, 2018 at 3:59

AsthaUndefined · Accepted Answer · 2018-11-02 04:46:42Z

2

The simplest way I found out is using stream.

String myTwoD[][] = { { "Apple", "Banana" }, { "Pork", "Beef" }, { "red", "green", "blue", "yellow" } };
List<String[]> list = Arrays.asList(myTwoD);

list.stream().flatMap(num -> Stream.of(num)).forEach(System.out::println);

To store the result into a 1D array. Do this:

String arr[] = list.stream().flatMap(num -> Stream.of(num)).toArray(String[]::new);

for (String s : arr) {
   System.out.println("Array is = " + s);
}

edited Nov 2, 2018 at 4:46

answered Nov 2, 2018 at 4:25

AsthaUndefined

1,1091 gold badge11 silver badges24 bronze badges

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

Comments

PradyumanDixit · Accepted Answer · 2018-11-02 04:37:20Z

1

There are numerous ways of how you can do it, one way can be first storing the contents of your 2D array to a list and then using it to store the elements in your new 1D array.

In code it looks something like this:

//arr being your old array

    ArrayList<String> list = new ArrayList<String>();

    for (int i = 0; i < arr.length; i++) {
        for (int j = 0; j < arr[i].length; j++) {  
            list.add(arr[i][j]); 
        }
    }

    // now you need to add it to new array


    String[] newArray = new String[list.size()];
    for (int i = 0; i < newArray.length; i++) {
        newArray[i] = list.get(i);
    }

edited Nov 2, 2018 at 4:37

answered Nov 2, 2018 at 4:01

PradyumanDixit

2,3652 gold badges15 silver badges20 bronze badges

9 Comments

SUPARNA SOMAN Over a year ago

I tried it but didn't work. Will this work for string? @PradyumanDixit

PradyumanDixit Over a year ago

@SUPARNASOMAN try the updated code

SUPARNA SOMAN Over a year ago

It is showing null values in the array now @PradyumanDixit

PradyumanDixit Over a year ago

Which array is showing null values? newArray must be having the values of your previous array.

PradyumanDixit Over a year ago

Can you show the exact code you're using for this, right now, because this code is and should be working. I can look into your code and tell what may have gone wrong.

|

Deepesh kumar Gupta · Accepted Answer · 2018-11-02 04:30:29Z

0

try this.

String myTwoD[][] = {{"Apple", "Banana"}, {"Pork", "Beef"},{"red", "green","blue","yellow"}};

    List<String> lt = new ArrayList<String>();

    for (String[] oneDArray : myTwoD) { //loop throug rows only
        lt.addAll(Arrays.asList(oneDArray));
    }

    String[] oneDArray =(String[])lt.toArray(new String[0]); //conversion of list to array      
    System.out.println(Arrays.toString(oneDArray)); //code for printing array

answered Nov 2, 2018 at 4:30

Deepesh kumar Gupta

8962 gold badges12 silver badges31 bronze badges

Collectives™ on Stack Overflow

How can I convert a Two D string array to One D string array? [duplicate]

3 Answers 3

Comments

9 Comments

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

9 Comments

Comments

Linked

Related