CODEWITHSUNDEEP
android
Pooja
Pooja

Reputation: 75

Android - how to read first line of the string

i have string with \n, i would like to read first line of the string. i have tried following but its giving error.

                String lines[] = plain.split("\\r?\\n");
                String a = String.parse(lines[0]);
                String b = String.parse(lines[1]);

in same time if someone tells me how to replace first line data with another value would be great.

my data is as follows

123456

A B C D

p o s j s u w

Thanks

Upvotes: 1

Views: 4284

Answers (5)

baumato
baumato

Reputation: 378

Since Java 11, you can do:

s.lines().findFirst().orElse(null)

Upvotes: 0

Ehsan Shadi
Ehsan Shadi

Reputation: 687

In case you use Kotlin, you can use lines() method

val myString = "Hello \n NewLine"
myString.lines() // this will give you a List<String> type

Upvotes: 0

ken sands
ken sands

Reputation: 41

I think you mean to only put \n and \r using double back slash will give you a literal \n

"\\n" = \n
"\n" = newline

I'm also not sure about your ? in the line

I think you want something like this (depending on the type of line endings):

String[] lines = plain.Split(new string[] {"\r\n", "\n", "\r" },StringSplitOptions.None);

After that you should probably step through your string array using for each or similar, not just assume that a you will have a [0] and [1] in the array.

However assuming you do have two lines accessing them will be 

a = lines[0];
b = lines[1];

replacing a value would be

a = lines[0].replace("stuff","things");

Upvotes: 3

Jack Siro
Jack Siro

Reputation: 797

To read a line we use:

 String myline = reader.readLine()

Now in your case we can use the follwoing code to read the first line however We will not use "\n" but we will look for another character like "&", "$" or even "#" and use it as below:

String mytext = "This is my code.$ I want to read the first line here.$ Please check it out";  
thetext = mytext .replace("$", System.getProperty("line.separator"));

String[] strings = TextUtils.split(mytext, "$");
String a = strings[0].trim();
String b = strings[1].trim();

String a is the first line while String b is the second line

Upvotes: 1

luckwithu
luckwithu

Reputation: 143

Hope fully this will help yours..

import java.util.Arrays;
public class JavaApplication1 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        String data = "123456\n"
                + "\n"
                + "A B C D\n"
                + "\n"
                + "p o s j s u w\n"
                + "\n"
                + "Thanks";
        String[] lines = data.split("\\n");
          System.out.println("Before "+Arrays.toString(lines));
        lines[0]=lines[0].replace("123456","ABCD PUUJA");
        System.out.println("After "+Arrays.toString(lines));
    }

}

Upvotes: 1

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