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int compareTo(Object o)

or

int compareTo(String anotherString)

public class Test {

    public static void main(String args[]) {
        String str1 = "Strings";
        String str2 = "Strings";
        String str3 = "Strings123";

        int result = str1.compareTo(str2);
        System.out.println(result);

        result = str2.compareTo(str3);
        System.out.println(result);

        result = str3.compareTo(str1);
        System.out.println(result);
    }
}

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