CODEWITHSUNDEEP
java
Marshal
Marshal

Reputation: 261

How to sort based on alphanumeric values using java?

I'm having 3 values like 

a^100,b^200,c^150

I need to sort these values in the order of 

b^200,c^150,a^100

How can i do this in java?

Upvotes: 2

Views: 4968

Answers (2)

Dead Programmer
Dead Programmer

Reputation: 12575

String sample = "a^100,b^200,c^150";
List data = Arrays.asList(sample.split(","));
Collections.sort(data, Collections.reverseOrder( new Comparator<String>() {
public int compare (String obj1,String obj2)
{
  String num1 = obj1.split("\\^")[1];
  String num2 = obj2.split("\\^")[1];
  return  num1.compareTo(num2);
}
}));
String sortedSample[]= (String[])data.toArray(new String[data.size()]);
for (int z=0; z< sortedSample.length;z++ )
System.out.println(sortedSample[z]);

Upvotes: 0

aroth
aroth

Reputation: 54806

Use a custom Comparator, like this one:

public class IntegerSubstringCompare implements Comparator<String> {
    @Override
    public int compare(String left, String right) {
        Integer leftInt = Integer.parseInt(left.substring(left.indexOf("^") + 1));
        Integer rightInt = Integer.parseInt(right.substring(right.indexOf("^") + 1));

        return -1 * leftInt.compareTo(rightInt);
    }
}

You can use it like this:

public static void main(String[] args) {
    String[] input = {"a^100", "b^200", "c^150"};
    List<String> inputList = Arrays.asList(input);
    Collections.sort(inputList, new IntegerSubstringCompare());
    System.out.println(inputList);
}

Upvotes: 3

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