Question

How to sort a list of strings where each string represents a decimal number in Java

Answer 1

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

public class SortDecimalStrings {

    // Comparator method to sort strings as decimal numbers
    public static int compareAsDecimal(String a, String b) {
        // Convert strings to double for comparison
        double numA = Double.parseDouble(a);
        double numB = Double.parseDouble(b);

        return Double.compare(numA, numB);
    }

    public static void main(String[] args) {
        // Input list of strings
        List<String> numbers = Arrays.asList("12.3", "5.6", "789.1", "3.14", "456.0", 
                                             "0", "0.01", "4.0");

        // Sort the list using the custom comparator
        Collections.sort(numbers, (a, b) -> compareAsDecimal(a, b));

        System.out.println("Sorted list of decimal strings:");
        for (String num : numbers) {
            System.out.print(num + "  ");
        }
    }
}



/*
run:

Sorted list of decimal strings:
0  0.01  3.14  4.0  5.6  12.3  456.0  789.1  

*/

 

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