Java Utililty Methods Scanner Usage

List of utility methods to do Scanner Usage

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Description

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

Method

ListstringToDoubleList(String s)
string To Double List 
Scanner scanner = new Scanner(s);
if (s.indexOf(',') != -1) {
    scanner.useDelimiter(",");
List<Double> data = new ArrayList<Double>();
while (scanner.hasNextDouble()) {
    data.add(scanner.nextDouble());
scanner.close();
return data;
voidswapElements(int length, int maxValue)
swap Elements 
int[] randomArray = new int[length];
for (int i = 0; i < randomArray.length; i++) {
    randomArray[i] = (int) (Math.random() * maxValue);
    System.out.print(randomArray[i]);
Scanner scan = new Scanner(System.in);
System.out.println("\nEnter two indexes from the array above: ");
int index1 = scan.nextInt();
...
StringtermInput()
term Input 
Scanner in = new Scanner(System.in);
String result = "";
boolean done = false;
while (!done) {
    result = in.nextLine();
    if (result.length() < 3) {
        System.out.println("Please enter at least one keyword that's " + "at least 3 characters long:");
    } else {
...
voidTokenize(String s, String s2, String s3)
Tokenize 
StringTokenizer tok = new StringTokenizer(s, " ");
System.out.println("Jumlah token: " + tok.countTokens());
int i = 0;
while (tok.hasMoreTokens()) {
    System.out.println(tok.nextToken());
    i++;
System.out.println("Jumlah token: " + i);
...
LongtoNumeric(String ip)
Method to convert ip value in long. 
Scanner sc = new Scanner(ip).useDelimiter("\\.");
return (sc.nextLong() << 24) + (sc.nextLong() << 16) + (sc.nextLong() << 8) + (sc.nextLong());
ArrayListtoWords(String content)
to Words 
Scanner s = new Scanner(content);
s.useDelimiter("\\s");
ArrayList<String> wordsArray = new ArrayList<>();
while (s.hasNext()) {
    wordsArray.add(s.next().toLowerCase());
s.close();
return wordsArray;
...
StringtransformTXTandANNtoRQS(String TXT, String ANN)
Transforms a txt and an ann string to a string complying to the rqs format. 
ArrayList<String> requirements = new ArrayList<String>();
Scanner txtScanner = new Scanner(TXT);
while (txtScanner.hasNextLine()) {
    requirements.add(txtScanner.nextLine());
txtScanner.close();
ArrayList<String> annotations = new ArrayList<String>();
Scanner annScanner = new Scanner(ANN);
...
Stringtrim(String s)
Removes all ending \r and/or \n 
if (s == null)
    return null;
Scanner scanner = new Scanner(s);
String res = "";
while (scanner.hasNextLine()) {
    if (!res.equals("")) {
        res = res + "\n";
    res = res + scanner.nextLine();
return res;
intvalidateInt(Scanner keyboard, String message, String error)
validateInt - validates that a user has entered a correct value such as an integer. 
int returnValue = 0;
boolean isError = true;
do {
    try {
        System.out.println(message);
        returnValue = keyboard.nextInt();
        keyboard.nextLine();
        isError = false;
...
voidwaitForEnter()
Calling this method waits until the user presses enter (scans standard input for next line), writing a default message to standard output: "[Press enter to continue]". 
waitForEnter("[Press enter to continue]");