Question

How to extract the last number from string in Java

Answer 1

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MyClass {
    public static void main(String args[]) {
        String s = "412hjdsf72q1p0on8mqjava9953";
 
        Pattern p = Pattern.compile("\\d+");
        Matcher m = p.matcher(s);
        
        int n = 0;
        while (m.find()) {
            n = Integer.parseInt(m.group());
        }
        
        System.out.println(n);
    }
}
 
 
 
 
/*
run:
 
9953
 
*/

 

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Answer 2

public class MyClass {
    public static void main(String args[]) {
        String str = "412hjdsf72q1p0on8mqjava9953"; 
 
        String[] arr = str.split("\\D+");
 
        int number = Integer.parseInt(arr[arr.length - 1]);
 
        System.out.print(number);
    }
}
 
  
  
  
/*
run:
       
9953
    
*/

 

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Answer 3

public class MyClass {
    public static int extractLastNumberFromString(String str) {
        String[] arr = str.split("\\D+");
 
        return Integer.parseInt(arr[arr.length - 1]);
    }
    public static void main(String args[]) {
        String str = "412hjdsf72q1p0on8mqjava9953"; 
 
        int number = extractLastNumberFromString(str);
 
        System.out.print(number);
    }
}
 
  
  
  
/*
run:
       
9953
    
*/

 

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