In this article, we will discuss how we can compare two strings lexicographically in Java.
One solution is to use Java compareTo() method. The method compareTo() is used for comparing two strings lexicographically in Java. Each character of both the strings is converted into a Unicode value for comparison.
int compareTo(String str) :
It returns the following values:
- if (string1 > string2) it returns a positive value.
- if both the strings are equal lexicographically
i.e.(string1 == string2) it returns 0.
- if (string1 < string2) it returns a negative value.
Comparing strings with compareto: 0 -1 17
Refer How to Initialize and Compare Strings in Java? for more details.
How to compare two strings without using library function?
1. Input two strings string 1 and string 2. 2. for (int i = 0; i < str1.length() && i < str2.length(); i ++) (Loop through each character of both strings comparing them until one of the string terminates): a. If unicode value of both the characters is same then continue; b. If unicode value of character of string 1 and unicode value of string 2 is different then return (str1[i]-str2[i]) 3. if length of string 1 is less than string2 return str2[str1.length()] else return str1[str2.length()]
Below is the implementation of above algorithm.
-9 0 9 -8 8
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