In Java String w1="abab", w2="abe"; System.out.println(w1.compareTo(w2));

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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In Java

String w1="abab", w2="abe";

System.out.println(w1.compareTo(w2));

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Explanation

1) In Java string compareTo() method is used to compare two strings lexicographically.

  • Each character of both the strings is converted into a Unicode value for comparison.

2) It returns the following values:

  1. if (string1 > string2) it returns a positive value.
  2. if both the strings are equal lexicographically
    i.e.(string1 == string2) it returns 0.
  3. if (string1 < string2) it returns a negative value.

3) In above program

  • We string w1 = "abab" and w2 = "abe"
  • It compare w1 and w2 using compareTo function
  • And prints comparision result

4) It compare each character unicode value

  • 'a' from w1 is same as 'a' from w2
  • 'b' from w1 is same as 'b' from w2
  • 'a' from w1 is not same as 'e' from w2, so result will be negative
  • unicode value of 'a' is 97 and uncode value of 'e' is 101, so differece =  97-101 = -4
  • So it displays -4

 

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