Question

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

Answer 1

import java.util.Arrays;
import java.util.List;
 
public class Program {
    public static boolean listIsSorted(List<Integer> list) {
        int size = list.size();
         
        for (int i = 0; i < size - 1; i++) {
            if (list.get(i) >= list.get(i + 1)) {
                return false;
            }
        }
         
        return true;
    }
     
    public static void main(String[] args) {
        List<Integer> list = Arrays.asList(3, 5, 6, 9, 12, 34, 567, 890);
 
        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<Integer> list = Arrays.asList(3, 5, 6, 9, 12, 34, 567, 890);
        
        boolean result = list.stream().sorted().collect(Collectors.toList()).equals(list);
 
        System.out.println(result);
    }
}
 
 
 
/*
run:
 
true
 
*/

 

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