Shaz Software Solutions

Java IsNumber and String Split Methods

Class: TextUtility
Author: Shahrzad Jahangirian
Language: Java (using Java 6) Download Java 6 and Download Java Runtime 6(JRE)
Date Added: Dec 8, 2013
Description: TextUtility class includes Java String Utilities with two methods, the first method is isNumber(String input) String utility that takes a String and return a boolean value of true if input is a number or return false if the entry is not a number. The second method of this Java utility class is breakText(String text, String symbol, boolean keep), this method gets some lines of text and split them by the symbol, and if keep parameter is true the symbol also return with split words and it will be removed if keep is false.
How to Run: I tested all codes on Windows 7 Command Prompt with Java(TM) SE Runtime Environment 6 on my computer. ( you may download it by visiting this link )
You need to create all files and save it in a folder in your computer such as C:\javacodes and compile and run at command prompt as follows. I assumed you saved all files at C:\javacodes
C:\javacodes> javac TextUtility.java -d c:\javacodes "this statement compiles the class and creates TextUtilityPKG package"
C:\javacodes> javac BreakTextMain.java "compiles the Main class to test BreakText method of TextUtility class"
C:\javacodes> Java BreakTextMain "and this statement runs the BreakTextMain.java"
C:\javacodes> javac IsNumberMain.java "compiles the Main class to test isNumber method from TextUtility class."
C:\javacodes> Java IsNumberMain "and this statement runs the IsNumberMain.java"

TextUtility Java class code that has java string split example method that uses Java StringTokenizer

/*
 * Class: TextUtility
 * Author: Shahrzad Jahangirian
 * Date: Dec 8, 2013
 * Description: TextUtility class has two methods, the first method is isNumber(String input) 
 * that takes a String and return a boolean value of true if input is a number or return false 
 * if the entry is not a number.
 * The second method is breakText(String text, String symbol, boolean keep), this method gets 
 * some lines of text and split them by the symbol, and if keep parameter is true the symbol 
 * also return with split words and it will be removed if keep is false.
 */

package TextUtilityPKG;

import java.util.*;
import java.lang.*;

public class TextUtility {

public TextUtility() {
    }

/*
     * Method Name: isNumber(String input)
     * Description: This method pass a String parameter and it validate the input to 
     * see is it a valid Number that could be a double, an integer, or a float.
     */
    public boolean isNumber(String input) {

boolean  valid = true;
        double number = 0.0;
        input = input.trim(); // no space in front and end

if (input.isEmpty() == false) {
            try {
                number = Double.valueOf(input).doubleValue();
            } catch (NumberFormatException e) {
                valid = false;
            }
        }
        return valid;
    }

/*
     * Method Name: breakText(String text, String symbol, boolean keep)
     * Description: This method passes some text to be broken by a symbol that symbol  
     * parameter could be a space, special symbols like ?,-,+ or a letter and save the 
     * result in an ArrayList to be return. If keep parameter is true, the symbol also 
     * will be included on broken words and vice versa if keep is false.
     */
    public ArrayList<String> breakText(String text, String symbol, boolean keep) {

StringTokenizer string = new StringTokenizer(text,symbol,keep);        
        ArrayList<String> result = new ArrayList<String>();
        while (string.hasMoreTokens()) {
            result.add(string.nextToken());          
        }
        return result;

}
}

This is the BreakTextMain class to runs breakText method of TextUtility class from Java command line input

/*
 * Class: BreakTextMain
 * Author: Shahrzad Jahangirian
 * Date: Dec 8, 2013
 * Description: This is a main code to test BreakText method of TextUtility class 
 * by calling it and save the result in an ArrayList and display its contents. Also 
 * there are statements for how to get user entry from command line in Java.
 */

import java.io.*;
import java.util.*;
import TextUtilityPKG.TextUtility;

public class BreakTextMain {

public static void main(String[] args) {
        TextUtility text = new TextUtility();
        String value = "";
        String split = "";
        boolean flag = false;
        ArrayList<String> resultList = new ArrayList<String>();
        BufferedReader userinput = new BufferedReader(new InputStreamReader(System.in), 1);

do {
            
            try {
                System.out.print("Input a some text to be broken (0 to Exit) ");
                value = userinput.readLine();
                value = value.trim();  
                System.out.print("\nInput a split symbol such as \" \" ");
                split = userinput.readLine();
                split = split.trim();                
                resultList = text.breakText(value,split,flag);
                System.out.println();
                for (int i=0; i < resultList.size(); i++ ){
                    System.out.println(resultList.get(i));
                }
            } catch (IOException ex) {
                System.out.println(ex.getMessage());
            }
        } while (value.equals("0") == false);
    }
}

This is the IsNumberMain class to runs isNumber method of TextUtility class from Java command line input

/*
 * Class: IsNumberMain
 * Author: Shahrzad Jahangirian
 * Date: Dec 8, 2013
 * Description: This is a main code to test isNumber method from TextUtility class.
 */

import java.io.*;
import TextUtilityPKG.TextUtility;

public class IsNumberMain {

public static void main(String[] args) {
        TextUtility text = new TextUtility();
        String value = "123456.00";
        BufferedReader userinput = new BufferedReader(new InputStreamReader(System.in), 1);

do {
            boolean valid = text.isNumber(value);
            if (valid == true) {
                System.out.println(value + " is a number");
            } else {
                System.out.println(value + " is not a number");
            }

try {
                System.out.println("Enter a value to see is it a Number? (0 to Exit)");
                value = userinput.readLine();
                value = value.trim();               
            } catch (IOException ex) {
                System.out.println(ex.getMessage());
            }
        } while (value.equals("0") == false);
    }
}