Delete part of element in Java String array

Question

I want to take input from user in String array. Delete few parts of it and print it out in different text area block.

For example:

Input in String array.

===========

Mr: Alex Simmons
Miss: Susan Kent
Mrs: J. Peterson

===========

I want the output to look something like this. After removing Mr:, Miss:, Mrs: rest of the values in a single line or element

===========
Alex Simmons Susan Kent J. Peterson

===========

Here is the code i am working with.

private void jButton18ActionPerformed(java.awt.event.ActionEvent evt) {
        String[] names = jTextArea11.getText().split("\\n");


        List<String> myList = new ArrayList<>(Arrays.asList(names));


        myList.remove("Mr:");
        myList.remove("Miss:");
        myList.remove("Mrs:");

        names = myList.toArray(new String[0]);

        jTextArea12.setText(Arrays.toString(names));
}

The above code isn't seems to be working out for me..

Output is:
[Mr: Alex Simmons, Miss: Susan Kent, Mrs: J. Peterson]

"[ ]" braces at the end and separated by "," is not what i had in mind. Also the remove() isn't seems to be working.

.remove() operates on the list itself, not on the elements of the list. The remove would work if your list had somebody's name as literally just Mr:, but you don't. — nickb
– nickb, Commented Jan 7, 2019 at 15:00
You need to go through each element in the list and remove the text until ': ' to get only the name part. — notionquest
– notionquest, Commented Jan 7, 2019 at 15:01

Rishi Saraf · Accepted Answer · 2019-01-07 15:08:19Z

3

Your code is incorrect. You are trying to remove element from list. Try below code. It will loopover your list. From each element it will replace desired string with empty string

 for (int i=0; i< myList.size();i++) {
      String newVal = myList.get(i).replace("Mr:", "").replace("Miss:", "").replace("Mrs:", "");
            myList.add(i,newVal);

}

Update: There is small correction. After replace we have to reset the replaces value in list

edited Jan 7, 2019 at 15:08

answered Jan 7, 2019 at 15:02

Rishi Saraf

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Comments

Sombriks · Accepted Answer · 2019-01-07 15:10:34Z

2

If you use java 8 take a look at map function

myList = myList.stream().map(s -> 
s.replaceAll("Mr|Miss|Mrs:","")).collect(Collectors.toList())

answered Jan 7, 2019 at 15:10

Sombriks

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Comments

Kars · Accepted Answer · 2019-01-07 15:12:49Z

1

This is one way to do it using substring. This will paste all the names together without spaces.

    String[] names = {"Mr. Smith","Mrs. Smith","Ms. Smith"};

    String newString = "";

    for (int i = 0; i < names.length; i++) {
        if (names[i].substring(0, 3).equals("Mr.") || names[i].substring(0, 3).equals("Ms.")) {
            newString += names[i].substring(4);
        } else if (names[i].substring(0,4).equals("Mrs.")) {
            newString += names[i].substring(5);
        }
    }

answered Jan 7, 2019 at 15:12

Kars

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Comments

azro · Accepted Answer · 2019-01-07 15:14:42Z

1

You need to operate the changement on the elements, no on the list, like :

List<String> myList = new ArrayList<>(Arrays.asList(names));
List<String> res = new ArrayList<>();
for(String name : myList){
    res.add(name.replaceAll("((Mr:|Miss:|Mrs:)\\s)", "");
}

str = String.join(", ", res);
jTextArea12.setText(str);

You can also use Stream operation and goes directly to the String without passing to en array:

List<String> myList = new ArrayList<>(Arrays.asList(names));
String str = myList.stream()
                   .map(name -> name.replaceAll("((Mr:|Miss:|Mrs:)\\s)", ""))
                   .collect(Collectors.joining(", "));
jTextArea12.setText(str);

edited Jan 7, 2019 at 15:14

answered Jan 7, 2019 at 15:09

azro

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Comments

Ousmane D. · Accepted Answer · 2019-01-07 15:24:00Z

Currently, when you perform the three remove calls:

myList.remove("Mr:");
myList.remove("Miss:");
myList.remove("Mrs:");

You're essentially trying to "remove 'Mr:' , 'Miss:' and 'Mrs:' from myList if they exist" but this is not what you want, rather what you want is to "remove the said data from the elements inside myList.

You could accomplish this via a typical for loop but it might just be more convenient to use a stream here as you later need to join the result and set the jTextArea12 to it.

Thus, after splitting you can use a stream to achieve the said requirement:

String result = Arrays.stream(names)
          .map(s -> s.replace("Mr:", "").replace("Miss:", "").replace("Mrs:", ""))
          .collect(Collectors.joining(" "));

jTextArea12.setText(result);

full code:

private void jButton18ActionPerformed(java.awt.event.ActionEvent evt) {
     String[] names = jTextArea11.getText().split("\\n");

     String result = Arrays.stream(names)
              .map(s -> s.replace("Mr:", "")
                         .replace("Miss:", "").replace("Mrs:", ""))
              .collect(Collectors.joining(" "));

     jTextArea12.setText(result);
}

Sandeepa · Accepted Answer · 2019-01-07 15:18:26Z

0

This will replace the Strings in the list with converted Strings and it will work for any number of Strings,

import java.util.Arrays;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        List<String> list = Arrays.asList("Mr: Alex Simmons", "Miss: Susan Kent", "Mrs: J. Peterson", "Mr: Abc", "Miss: Cdf");
        for (int i = 0; i < list.size(); i++) {
            list.set(i, list.get(i).replace("Mr:", ""));
            list.set(i, list.get(i).replace("Miss:", ""));
            list.set(i, list.get(i).replace("Mrs:", ""));
        }
        System.out.println(list);
    }
}

answered Jan 7, 2019 at 15:18

Sandeepa

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Comments

notionquest · Accepted Answer · 2019-01-07 15:20:23Z

0

Another solution using substring. The advantage of this approach is that the title (Mr, Miss etc) is not hardcoded.

If the title is there, it will skip that part. Otherwise, it will take the full name (see 1Peterson value in list).

public static void main(String[] args) {
    List<String> stringList = new ArrayList<>();
    stringList.add("Mr: Alex Simmons");
    stringList.add("Miss: Susan Kent");
    stringList.add("Mrs: J. Peterson");
    stringList.add("1Peterson");

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

    for (String s : stringList) {
        outList.add(s.substring(s.indexOf(": ")+1));
    }

    System.out.println(outList);
}

Output:-

[ Alex Simmons, Susan Kent, J. Peterson, 1Peterson]

answered Jan 7, 2019 at 15:20

notionquest

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