List<String> strings = Arrays.asList("a", "b", "a", ...);

//One Way Of Doing It

if(new HashSet<>(strings).size() == 1) {

    // all strings are equal

}

//Another Way Of Doing Iz:

if(strings.stream().distinct().count() == 1) {

    // all strings are equal

}

//This expression is true if str1 and str2 are equal, and false if they're not

str1.equals(str2)

​

//example use case:

String location = "London";

String destination = "London";

if (location.equals(destination)) {

    System.out.println("You have arrived!");

}

public class EqualsMethodDemo

{

   public static void main(String[] args)

   {

      String str1 = new String("HelloWorld");

      String str2 = new String("Flower");

      String str3 = new String("Hello");

      String str4 = new String("Hello");

      String str5 = new String("hello");

      // compare str1 != str2

      System.out.println("Compare " + str1 + " and " + str2 + ": " + str1.equals(str2));

      // compare str3 = str4

      System.out.println("Compare " + str3 + " and " + str4 + ": " + str3.equals(str4));

      // compare str4 != str5

      System.out.println("Compare " + str4 + " and " + str5 + ": " + str4.equals(str5));

      // compare str1 != str4

      System.out.println("Compare " + str1 + " and " + str4 + ": " + str1.equals(str4));

   }

}