Java Utililty Methods Scanner Read

List of utility methods to do Scanner Read

  1. HOME
  2. Java
  3. S
  4. Scanner Read

Description

The list of methods to do Scanner Read are organized into topic(s).

Method

StringreadFromScanner(Scanner scanner)
read From Scanner 
if (!scanner.hasNext()) {
    return new String();
return scanner.useDelimiter(REGEX_BEGINNING_OF_TEXT).next();
intreadInt(String prompt)
Writes a prompt to standard out and tries to read an int value from standard in. 
int value = 0;
boolean intRead = false;
do {
    System.out.print(prompt);
    try (Scanner line = new Scanner(System.in); Scanner scannerLine = new Scanner(line.nextLine());) {
        if (scannerLine.hasNextInt()) {
            intRead = true;
            value = scannerLine.nextInt();
...
StringreadLine(String format, Object... args)
read Line 
System.out.print(String.format(format, args));
return new Scanner(System.in).nextLine();
int[][]readMatrix(Scanner in, int n)
read Matrix 
int[][] matrix = new int[n][n];
for (int i = 0; i < n; i++) {
    matrix[i] = readArr(in, n);
return matrix;
char[]readPassword(String format, Object... args)
read Password 
if (System.console() != null)
    return System.console().readPassword(format, args);
System.out.println("WARNING -> Console password input unsupported, password entry in insecure mode!");
return readLine(format, args).toCharArray();
intreadPositiveInt(String message, Scanner input)
Read in a positive integer, which may come from a configuration file 
int value = Integer.parseInt(getNextInput(input));
if (value < 1) {
    throwException("Error.  Illegal configuration parameter: " + message + ": " + value);
return value;
ArrayListreadSystemInToIntArrayList()
read System In To Int Array List 
ArrayList<Integer> array = new ArrayList<Integer>();
Scanner sc = new Scanner(System.in);
while (sc.hasNextInt()) {
    array.add(sc.nextInt());
sc.close();
return array;
StringreadWholeString(Scanner s)
read Whole String 
return s.useDelimiter("\\A").hasNext() ? s.next() : "";