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TextUI.java
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TextUI.java
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// Class TextUI for program HelloWorld
// version 1.01.01-delta(rc)-Model T
// by Ray Arias, 31 August 2022
// subpackage: TextUI, version 1.01.01-delta(rc)-Model T
// semantic version 1.1.1-rc
import java.util.Scanner;
/* This is a class of static methods for
* obtaining user input, displaying out-
* put, and converting one datatype to
* another.
*/
public class TextUI {
// Creates and initializes a Scanner
// object in from java.init.Scanner
// and returns its reference.
public static Scanner openUI() {
Scanner result = new Scanner(System.in);
return result;
}
// Reads a String of input from the user
// using the Scanner object and returns
// it.
public static String readln(Scanner scanner) {
String result = scanner.nextLine();
return result;
}
// Reads a double from the user using
// the Scanner object and returns it.
public static double readdbl(Scanner scanner) {
double result = scanner.nextDouble();
scanner.nextLine();
return result;
}
// Reads an int from the user using
// the Scanner object and returns it.
public static int readint(Scanner scanner) {
int result = scanner.nextInt();
scanner.nextLine();
return result;
}
// Closes the Scanner object.
public static void closeUI(Scanner scanner) {
scanner.close();
}
// Uses the above methods to quickly
// create an instance of Scanner
// class, use it to read a line of
// user input, close the Scanner in-
// stance, and return the input as a
// String.
public static String quickReadln() {
Scanner scanner = TextUI.openUI();
String result = TextUI.readln(scanner);
TextUI.closeUI(scanner);
return result;
} // THIS METHOD NEEDS FIXING
// Sends characters to the console to
// clear the screen.
public static void clrscn() {
TextUI.display("\033[H");
TextUI.display("\033[2J");
}
// This method returns the numerical
// value of a char as an int.
public static int char2int(char c) {
return Character.getNumericValue(c);
}
// This method returns the ANSI char
// associated with the int given as a
// parameter.
public static char chr(int i) {
return (char) i;
}
// Displays char (no newline, unless)
// c is '\n'.
public static void chr(char c) {
System.out.print(c);
}
// Displays escape codes by passing
// only the character associated with
// them without the backward slash be-
// fore it.
public static void escchr(char c) {
char cc = c;
switch (cc) {
case '\\':
System.out.print('\\');
break;
case '\"':
System.out.print('\"');
break;
case '\'':
System.out.print('\'');
break;
case 'n':
System.out.print('\n');
break;
case 't':
System.out.print('\t');
break;
case 'r':
System.out.print('\r');
break;
case 'b':
System.out.print('\b');
break;
case 'f':
System.out.print('\f');
break;
}
}
// Display newline
public static void newln() {
System.out.println();
}
// Displays String specified in
// parameter without going to a
// new line at the end.
public static void display(String text) {
System.out.print(text);
}
// Displays int specified in
// parameter without going to a
// new line at the end.
public static void display(int i) {
System.out.print(i);
}
// Displays double specified in
// parameter without going to a
// new line at the end.
public static void display(double d) {
System.out.print(d);
}
// Displays String specified in
// patameter and then go to a
// new line afterward.
public static void displayln(String text) {
System.out.println(text);
}
// Displays int specified in
// patameter and then go to a
// new line afterward.
public static void displayln(int i) {
System.out.println(i);
}
// Displays double specified in
// patameter and then go to a
// new line afterward.
public static void displayln(double d) {
System.out.println(d);
}
// Displays an int and a String in
// the format expressed in the first
// String.
public static void dispf(String format, int n, String description) {
System.out.printf(format, n, description);
}
// Extracts the user's choice as the
// first character in the String typed
// in by the user.
public static char userChoice(String inputString) {
char result = inputString.toUpperCase().charAt(0);
return result;
}
}