如何验证是否使用Java按字母顺序对字符串数组进行排序？

Question

How to validate the String is in alphabetical order or not? It is just to validate that String is in order or not?

Can anybody help me how to validate? Here is my code::

public class Example3 {

    public static void main(String[] args) {

        String Month[]={"Jan", "Add", "Siri", "Xenon", "Cat"};

        for(int i=0; i<Month.length; i++) {     
            System.out.println(Month[i]);                   
        }
    }
}

Answer 1

You could get the i -th (i >= 1) element and apply compareTo(String other) against the previous one:

boolean ordered = true;
for (int i = 1; i < month.length; i++) {
    if (month[i].compareTo(month[i - 1]) < 0) {
         ordered = false;
         break;
    }
}

System.out.println(ordered ? "Ordered" : "Unordered");

Answer 2

Without a loop, just use Collections to compare them since the equals method works fine with this type of objects.

---

Solution

String[] Month={"Jan", "Add", "Siri", "Xenon", "Cat"};
List<String> copyOf = new ArrayList<>(Arrays.asList(Month));
Collections.sort(copyOf);
if (Arrays.asList(Month).equals(copyOf)){
    System.out.println("Sorted");
} else {
    System.out.println("Not sorted"); // Not sorted of course but if Month
                                      // was {"Add", "Siri"} it would've been true
}