Question

How to extract the number from the end of a string in Java

Answer 1

public class ExtractTheNumberFromEndOfString_Java
{
    public static int extractLastNumber(String str) {
        String[] arr = str.split("\\D+");
    
        return Integer.parseInt(arr[arr.length - 1]);
    }
 
    public static void main(String[] args)
    {
        String str = "java 84 programming172";
         
        int n = extractLastNumber(str);
            
        System.out.print(n);
    }
}
  
   
   
/*
run:
    
172
    
*/

 

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Answer 2

public class ExtractTheNumberFromEndOfString_Java
{
    public static int extractLastNumber(String str) {
        int i = str.length();
        
        while (i > 0 && Character.isDigit(str.charAt(i - 1))) {
                i--;
        }
        
        return Integer.parseInt(str.substring(i));
    }

    public static void main(String[] args)
    {
        String str = "java 84 programming172";
        
        int n = extractLastNumber(str);
           
        System.out.print(n);
    }
}
 
  
  
/*
run:
   
172
   
*/

 

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