Question

How to check if a list of Strings is sorted in Java

Answer 1

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

public class Program {
    public static boolean listIsSorted(List<String> list) {
        if (list.size() == 1) {
            return true;
        }
    
        Iterator<String> iter = list.iterator();
        String current, previous = iter.next();
    
        while (iter.hasNext()) {
            current = iter.next();
            if (previous.compareTo(current) > 0) {
                return false;
            }
            previous = current;
        }
    
        return true;
    }
    
    public static void main(String[] args) {
        List<String> list = Arrays.asList("c", "c#", "c++", "java", "python");

        System.out.println(listIsSorted(list));
    }
}



/*
run:

true

*/

 

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Answer 2

import java.util.List;
import java.util.Arrays;
import java.util.stream.Collectors;
 
public class Program {
    public static void main(String[] args) {
        List<String> list = Arrays.asList("c", "c#", "c++", "java", "python");
        
        boolean result  = list.stream().sorted().collect(Collectors.toList()).equals(list);
 
        System.out.println(result);
    }
}
 
 
 
/*
run:
 
true
 
*/

 

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