Question

How to get the first line of a multi-line string in Java

Answer 1

import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;

public class GetTheFirstLineOfAMultiineString_Java {
    public static String getFirstLine(String multiLineString) {
        BufferedReader reader = new BufferedReader(new StringReader(multiLineString));
        String firstLine = null;
        try {
            firstLine = reader.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return firstLine;
    }

    public static void main(String[] args) {
        String multiLineString = 
            "First line\n" +
            "Second line\n" +
            "Third line\n" +
            "Fourth line";
        
        String firstLine = getFirstLine(multiLineString);
        
        System.out.println("The first line is: " + firstLine);
    }
}

   
   
/*
run:
   
The first line is: First line
   
*/

 

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Answer 2

public class GetTheFirstLineOfAMultiineString_Java {
    public static void main(String[] args) {
        String multiLineString = 
            "First line\n" +
            "Second line\n" +
            "Third line\n" +
            "Fourth line";
        
        String firstLine[] = multiLineString.split("\n", 4);
        
        System.out.println("The first line is: " + firstLine[0]);
    }
}

   
   
/*
run:
   
The first line is: First line
   
*/

 

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Answer 3

public class GetTheFirstLineOfAMultiineString_Java {
    public static void main(String[] args) {
        String multiLineString = 
            "First line\n" +
            "Second line\n" +
            "Third line\n" +
            "Fourth line";
        
        String firstLine = multiLineString.substring(0, multiLineString.indexOf("\n"));
        
        System.out.println("The first line is: " + firstLine);
    }
}

   
   
/*
run:
   
The first line is: First line
   
*/

 

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