Java split string from array

Question

I have a string array that contains some information.

Example:

 String [] testStringArray;

 testStringArray[0]= Jim,35
                     Alex,45 
                     Mark,21

 testStringArray[1]= Ana,18
                    Megan,44

This is exactly how the information is. Now my problem is I want to make each element a seperate element in an array and I want to split it based on the \n character.

So I want

        newArray[0]=Jim,35
        newArray[1]=Alex,45
        newArray[2]=Mark,21
        newArray[3]=Ana,18

etc etc. I am aware of the split method but won't this just split each array element into a completely new array instead of combining them?

If anyone could help, it would be appreciated. Thanks

@RohitJain Can you please provide an example? also not sure if this affects your answer but the data is not always set. That is how the data looks like but sometimes there might be 40 components to an array opposed to just 2. Thanks — Alex G
– Alex G, Commented Nov 29, 2012 at 8:11

jlordo · Accepted Answer · 2012-11-29 08:28:45Z

2

Something like this:

    // Splits the given array of Strings on the given regex and returns
    // the result in a single array.
    public static String[] splitContent(String regex, String... input) {
        List<String> list = new ArrayList<>();
        for (String str : input) {
            for (String split : str.split(regex)) {
                list.add(split);
            }
        }
        return list.toArray(new String[list.size()]);
    }

you can call it this way:

    String[] testStringArray = ...;
    String[] newArray = splitContent("\n", testStringArray);

Because of the use of varargs you can also call it like this:

    String[] newArray = splitContent("\n", str1, str2, str3, str4);

where strX are String variables. You can use any amount you want. So either pass an array of Strings, or any amount of Strings you like.

If you don't need the old array anymore, you can also use it like this:

    String[] yourArray = ...;
    yourArray = splitContent("\n", yourArray);

edited Nov 29, 2012 at 8:28

answered Nov 29, 2012 at 8:13

jlordo

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4 Comments

Alex G Over a year ago

I am new to java so do you mind explaining/writing the code exactly as it should be? Like where should I put testStrngArray? Thanks

jlordo Over a year ago

wherever you already have your testStringArray you can call String[] newArray = splitContent("\n", testStringArray); and in that place you'll have the newArray containing the content you wanted.

Alex G Over a year ago

Makes sense. Thanks. But what is the parameter "String...input"? Is that just String input? Thanks

jlordo Over a year ago

Thanks, I added one more hint anyway.

lawl0r · Accepted Answer · 2012-11-29 08:15:29Z

0

    String[] testStringArray = new String[2];
    ArrayList<String> result = new ArrayList<String>();
    testStringArray[0]= "Jim,35\nAlex,45\nMark,21";
    testStringArray[1]= "Jiam,35\nAleax,45\nMarak,21";
    for(String s : testStringArray) {
        String[] temp = s.split("\n");
        for(String t : temp) {
            result.add(t);
        }
    }
    String[] res = result.toArray(new String[result.size()]);

answered Nov 29, 2012 at 8:15

lawl0r

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Comments

Nirav Ranpara · Accepted Answer · 2012-11-29 08:21:50Z

0

Try This is working Code >>

String[] testStringArray = new String[2]; // size of array

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

    testStringArray[0]= "Jim,35\nAlex,45\nMark,21"; // store value
    testStringArray[1]= "Ana,18\nMegan,44";

    for(String s : testStringArray) {
        String[] temp = s.split("\n"); // split from \n
        for(String t : temp) {
            result.add(t);   // add value in result
            System.out.print(t);


        }
    }
    result.toArray(new String[result.size()]);

answered Nov 29, 2012 at 8:21

Nirav Ranpara

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1 Comment

Alex G Over a year ago

The only issue is it is hard coded... I don't always know what the exact data is/ how much data there will be. The above is how it will look but not necessarily what the data is. Any other suggestions? Thanks

Wang Wei · Accepted Answer · 2012-11-29 08:23:13Z

0

you can first merge the strings into one string and then use the split method for the merged string.

testStringArray[0]= Jim,35
                     Alex,45 
                     Mark,21

testStringArray[1]= Ana,18
                    Megan,44

StringBuffer sb = new StringBuffer();

for(String s : testStringArray){

    s = s.trim();
    sb.append(s);
    if (!s.endWith("\n")){
        sb.append("\n");
    }

}

String[] array = sb.toString().split("\n");

edited Nov 29, 2012 at 8:23

answered Nov 29, 2012 at 8:16

Wang Wei

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Comments

Flexo · Accepted Answer · 2012-11-29 08:26:32Z

0

Try this. It is simple and readable.

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

for (String s : testStringArray) {
    newArray.addAll(Arrays.asList(s.split("\\n"));
}

answered Nov 29, 2012 at 8:26

Flexo

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Comments

chribsen · Accepted Answer · 2012-11-29 08:18:34Z

-1

Firstly, you can't write what you just did. You made a String array, which can only contain Strings. Furthermore the String has to be in markers "" like "some text here".

Furthermore, there can only be ONE String at one place in the array like:

 newArray[0] = "Jim";
newArray[1] = "Alex";

And NOT like:

newArray[0] = Jim;

And CERTAINLY NOT like:

// Here you're trying to put 2 things in 1 place in the array-index
newArray[0] = Jim, 35;

If you wan't to combine 2 things, like an name and age you have to use 2D array - or probably better in your case ArrayList.

Make a new class with following object:

  public class Person {

    String name;
    int age;

    public Person(String name, int age) {
    this.name = name;
    this.age = age;
    }
    }

And afterwards go to your class where you want to use the original array, and write:

ArrayList<Person> someNameOfTheArrayList = new ArrayList<Person>();

someNameOfTheArrayList.add(new Person("Jim", 32));
someNameOfTheArrayList.add(new Person("Alex", 22));

answered Nov 29, 2012 at 8:18

chribsen

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2 Comments

Alex G Over a year ago

No disrespect but you can certianly have this as a string within a string array "Mark,36"

chribsen Over a year ago

Thats correct. Though, judging from the post there was not quotation-marks around the String, hence the comma-mark would indicate that the he is trying to initialize 2 String (or in my opinion 1 String and 1 Integer) in the String-array.

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