how to read a file into an array java code example

Example 1: from file to array java

BufferedReader abc = new BufferedReader(new FileReader(myfile));
List<String> lines = new ArrayList<String>();

while((String line = abc.readLine()) != null) {
    lines.add(line);
    System.out.println(data);
}
abc.close();

// If you want to convert to a String[]
String[] data = lines.toArray(new String[]{});

Example 2: from file to array java

BufferedReader bufferedReader = new BufferedReader(new FileReader(myfile));
String []data;
data = new String[10]; // <= how can I do that? data = new String[lines.size]

for (int i=0; i<lines.size(); i++) {
    data[i] = abc.readLine();
    System.out.println(data[i]);
}
abc.close();

Example 3: examples of java programs that read files and put them into arrays

Scanner scanner = new Scanner(new File("input.txt"));
int [] tall = new int [100];
int i = 0;
while(scanner.hasNextInt())
{
     tall[i++] = scanner.nextInt();
}

Example 4: from file to array java

ArrayList<String> result = new ArrayList<>();
 
try (BufferedReader br = new BufferedReader(new FileReader(filename))) {
    while (br.ready()) {
        result.add(br.readLine());
    }
}