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Compare() method in JAVA.(Different return value compare two different string in JAVA)

CODING:
class compare{
 public static void main(String args[]){
   String s1="Kartik";
   String s2="kartik";
   String s3="Kdrtik";
   System.out.println("(Kartik)compare(kartik)=" + s1.compareTo("Kartik"));
   System.out.println("(Kartik)compare(kartik)=" + s1.compareTo(s2));
   System.out.println("(Kdrtik)compare(Kartik)=" + s3.compareTo(s1));
 }
}

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