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How to create a method send in an array of names in “firstName lastName” form(ex:Anna Hale). The method returns the name(through a return statement) in the form “first---last”. Below is my full name array

public static void readData(String file) throws FileNotFoundException 
 x = new Scanner(new File(file));

 n = 0;
 while(x.hasNextLine()) 
 n++;
 x.nextLine();
 
 name = new String[n];
 Scanner x1 = new Scanner(new File(file));

 for(int i = 0; i < name.length; i++ ) 
 name[i] = x1.nextLine();
 System.out.println(Arrays.toString(name));

Here is the full code assuming you want to read from file. Please correct the compile time errors in your code posted. Since you do not know the length of array in advance you can't initialise the array or you can change the logic to get the number of lines then initialise array.

The file contents looks like below:

abc xyzzy
And sdff
Asdf sdfw

The output looks like below

[abc--xyzzy, And--sdff, Asdf--sdfw]

In the below code name[i].replace(" ", "--"); replaces space " " with --

Code:

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

public class Post1 

 public static void main(String args) throws FileNotFoundException 
 String transformedNames = readData("/Users/kuma/Desktop/post1.txt");
 System.out.println(Arrays.toString(transformedNames));
 

 public static String readData(String file) throws FileNotFoundException 
 Scanner x = new Scanner(new File(file));
 List<String> list = new ArrayList<>();

 while(x.hasNextLine()) 
 list.add(x.nextLine());
 
 x.close();
 String name = new String[list.size()];

 list.toArray(name);

 String transformedNames = new String[list.size()];

 for(int i = 0; i < name.length; i++ ) 
 transformedNames[i] = name[i].replace(" ", "--");

 return transformedNames;
 

The same is being achieved in Java 8 using stream API:

private static String readDataUsingJava8() 
 String transformedNames = null;
 try (Stream<String> stream = Files.lines(Paths.get( "/Users/kuma/Desktop/post1.txt"))) 
 transformedNames =
 stream.map(new Function<String, String>() 

 @Override
 public String apply(String t) 
 // TODO Auto-generated method stub
 return t.replace(" ", "--");
 
 ).toArray(String::new);

 catch (IOException e) 
 e.printStackTrace();
 
 return transformedNames;