Java method that uses a StringBuilder instance to remove all the punctuation from a string s storing a sentence

Problem:

Write a short Java method that uses a StringBuilder instance to remove all the
punctuation from a string s storing a sentence

Solution:

package com.basics;

import java.util.Scanner;

public class RemovePunctuationFromAString {

String sentence = "";

public static void main(String[] args) {
RemovePunctuationFromAString removePunctuationFromAString = new RemovePunctuationFromAString();
removePunctuationFromAString.getTheNumber();
System.out.println("After removing all the punctuations: " + removePunctuationFromAString.removePunctuation());

}

public void getTheNumber(){
Scanner scanner = new Scanner(System.in);
System.out.println("enter a sentence with punctuation");
sentence = scanner.nextLine();
scanner.close();
}

public String removePunctuation(){
StringBuilder outputStr = new StringBuilder();
char[] characters = sentence.toCharArray();
int asciiValue = 0;
for (int i = 0; i < characters.length; i++) {
asciiValue = (int)characters[i];
if(!(asciiValue > 32 && asciiValue < 48)){
outputStr.append(characters[i]);
}
}

return outputStr.toString();
}

}

Output:

enter a sentence with punctuation
Let's try, Mike!
After removing the all punctuations: Lets try Mike