Java Utililty Methods Scanner Read

List of utility methods to do Scanner Read

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Description

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

Method

StringreadFile(String filePath)
read File 
return readFile(new File(filePath));
StringreadFile(String filePath)
Converts the contents of a file into a String. 
Scanner scanner = null;
try {
    scanner = new Scanner(new File(filePath)).useDelimiter("\\A");
    return scanner.next();
} finally {
    if (scanner != null) {
        scanner.close();
StringreadFile(String filePath)
Reads the file with the specified path as a String. 
BufferedReader br = new BufferedReader(new FileReader(filePath));
Scanner sc = new Scanner(br);
try {
    return sc.useDelimiter("\\Z").next();
} finally {
    sc.close();
    br.close();
StringreadFile(String path)
read File 
return readFile(new File(path));
char[]readFile(String pathname)
This method reads a file and returns the file content as char array. 
File file = new File(pathname);
String str = "";
Scanner scanner = new Scanner(file);
while (scanner.hasNextLine()) {
    str += scanner.nextLine();
return str.toLowerCase().toCharArray();
ScannerreadFile(String project, boolean judge)
read File 
if (judge)
    return new Scanner(new File("E:\\novice\\judgedata\\" + project + ".dat"));
else
    return new Scanner(new File("sampledata\\" + project + ".dat"));
StringreadFileFully(InputStream stream)
read File Fully 
StringBuilder stringBuilder = new StringBuilder();
try (Scanner scanner = new Scanner(stream)) {
    while (scanner.hasNext()) {
        stringBuilder.append(scanner.next());
return stringBuilder.toString();
ListreadFileToList(File file)
read File To List 
ArrayList<String> list = new ArrayList<>();
try {
    Scanner scan = new Scanner(file);
    while (scan.hasNextLine()) {
        list.add(scan.nextLine());
} catch (FileNotFoundException ex) {
    return null;
...
SetreadFileWithoutComments(File input)
read File Without Comments 
Set<String> adsList;
try (Scanner scanner = new Scanner(input)) {
    adsList = new HashSet<String>(10000);
    final String COMMENT_MARKER = "#";
    while (scanner.hasNextLine()) {
        String line = scanner.nextLine().trim();
        if (line.startsWith(COMMENT_MARKER) || line.isEmpty()) {
            continue;
...
StringreadFromReader(Scanner scanner)
This method is used to read input from buffered reader. 
String input;
input = scanner.nextLine().trim();
return input;