String.split Array into another 2D String Array

Question

I am trying to convert an Array of Strings into another 2D Array of Strings by using .split(), so that every row of the 2D Array is filled with one of the split parts. The Array i want to split, should be split into 3 parts as followed:

Content of the Array:

[0]= "25-Mar-18", [1]= "20-Dec-18",[2]= "1-Jan-15";

How it should look like in the 2D Array:

row [0] [0]= "25", [1]= "Mar", [2]= "18";
row [1] [0]= "20", [1]= "Dec", [2]= "18";
row [2] [0]= "1",  [1]= "Jan", [2]= "15";

You get the point... Here is my Code. And my Question: is it even possible to store the array with.split into a 2D Array?

Code:

String[] string = {"25-Mar-18", "20-Dec-18", "1-Jan-15"};
String[] [] parts;

void draw(){
  for(int i=0; i<string.length;i++){
    for(int j=0; j<3;j++){
      parts[i] [j] = string[i].split("-");
    }
  }
  printArray(parts);
}

Error:

Error: Type mismatch, "java.lang.String[]" does not match with "java.lang.String"

Youcef LAIDANI · Accepted Answer · 2018-04-09 09:49:14Z

1

You have to use :

parts[i] = string[i].split("-");

Instead of :

parts[i][j] = string[i].split("-");

Why!

because string[i].split("-") return an array and not a single String, and the parts if an array of array.

Now it gives me a NullPointerException...

because you are not Initialize the array String[] [] parts; to solve your problem you can use :

parts = new String[string.length][];

edited Apr 9, 2018 at 9:49

answered Apr 9, 2018 at 9:09

Youcef LAIDANI

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1 Comment

Youcef LAIDANI Over a year ago

@OliverTworkowski because you are not Initialize the array check my edit!

Imal · Accepted Answer · 2018-04-09 09:13:57Z

1

String.split("-") method returns an array of Strings. Ex: if "25-Nar-18" then {["25"], ["Mar"], ["18"]}

So your code should be corrected as

for(int i=0; i<string.length;i++){
    String[] temp = string[i].split("-");
    for(int j=0; j<3;j++){
      parts[i] [j] = temp[j];
    }
}

answered Apr 9, 2018 at 9:13

Imal

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1 Comment

Oliver Tworkowski Over a year ago

Hey, this also gives me a nullpointerexception in the line of the 2D array

FHTMitchell · Accepted Answer · 2018-04-09 09:47:59Z

0

You are getting a nullPointerException because you aren't initialising the array. Do

  String[] string = {"25-Mar-18", "20-Dec-18", "1-Jan-15"};
  String[][] parts = new String[3][3];

  void draw() {
    for(int i = 0; i < string.length; i++){
      parts[i] = string[i].split("-");
    }
  }

answered Apr 9, 2018 at 9:47

FHTMitchell

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Comments

Oliver Tworkowski · Accepted Answer · 2018-04-09 10:04:07Z

0

String[] string = {"25-Mar-18", "20-Dec-18", "1-Jan-15"};
String[] [] parts=new String[string.length][];

void setup(){
  for(int i=0; i<string.length;i++){
    parts[i]=string[i].split("-");
  }
  printArray(parts[0]);
}

Question anwsered by 'YCF_L'

answered Apr 9, 2018 at 10:04

Oliver Tworkowski

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