Question

How to sort by numbers a mixed pair of string and number elements in a list with Java

Answer 1

import java.util.Arrays;
import java.util.List;

public class SortByNumber {
    public static void main(String[] args) {
        List<String> lst = Arrays.asList(
            "Python 4", "C 9", "C++ 5", "C# 6",
            "Java 1", "PHP 7", "Go 2"
        );

        lst.sort((a, b) -> {
            int numA = extractNumber(a);
            int numB = extractNumber(b);
            return Integer.compare(numA, numB);
        });

        lst.forEach(System.out::println);
    }

    private static int extractNumber(String s) {
        int pos = s.lastIndexOf(' ');
        
        return Integer.parseInt(s.substring(pos + 1));
    }
}



/*
run:

Java 1
Go 2
Python 4
C++ 5
C# 6
PHP 7
C 9

*/

 

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