JAVA

reading in lines from a file java

private ArrayList<String> readFileLines(String filepath) throws FileNotFoundException, IOException{
  File fp = new File(filepath);
  FileReader fr = new FileReader(fp);
  BufferedReader br = new BufferedReader(fr);

  ArrayList<String> lines = new ArrayList<>();
  String line;
  while((line = br.readLine()) != null) { lines.add(line); }

  fr.close();
  return lines;
}

java read each lines in file

        BufferedReader br = null;
        try {
            File file = new File("myfile.txt"); // java.io.File
            FileReader fr = new FileReader(file); // java.io.FileReader
            br = new BufferedReader(fr); // java.io.BufferedReader
            String line;
            while ((line = br.readLine()) != null) {
              // process the line
            }
          }
          catch(IOException e) { e.printStackTrace();}
          finally
          {
              try { if (br != null) br.close(); }
              catch(IOException e) { e.printStackTrace(); }
          }

java read lines from file

        Scanner sc = null;
        try {
            File file = new File("myfile.txt"); // java.io.File
            sc = new Scanner(file);     // java.util.Scanner
            String line;
            while (sc.hasNextLine()) {
              line = sc.nextLine();
              // process the line
            }
          }
          catch(FileNotFoundException e)
          {
              e.printStackTrace();
          }
          finally {
            if (sc != null) sc.close();
          }

java read a line of input

// Java program to demonstrate working of Scanner in Java
import java.util.Scanner;
 
class GetInputFromUser {
    public static void main(String args[])
    {
        // Using Scanner for Getting Input from User
        Scanner in = new Scanner(System.in);
 
        String s = in.nextLine();
        System.out.println("You entered string " + s);
 
        int a = in.nextInt();
        System.out.println("You entered integer " + a);
 
        float b = in.nextFloat();
        System.out.println("You entered float " + b);
    }
}