Java String compareTo() Method
What is String?
In Java, an string class is a series of characters that are interpreted literally by a script. The string can be either only letters or be letters and numbers in most programming languages. For example, “PrepInsta” is a string containing a sequence of characters ‘P’, ‘r’, ‘e’ , ‘p’ , ‘I’, ‘n’, ‘s’ , ‘t’, ‘a’
To know more about String Class in java read the complete article.
String compareTo() Method
The main work of java string class compareTo() is to compare the string with the comment string lexicographically. It returns a positive number, negative number, or 0.
Note: The given string and the current string is compared on the basis of the Unicode value of each character present in the string.
2. The outcome is a Positive integer if the first string is lexicographically longer than the second string.
3. The result is zero if it is lexically equal to the second string.
- If it is impossible to compare this item to the specified object, a ClassCastException is thrown.
- If the specified object is null, a NullPointerException is thrown.
Syntax:
public int compareTo(String anotherString)
Parameters:
anotherString - the String to be compared.
Let’s look at a string-related Java program where the compareTo() method is used to perform an operation on the given string.
Examples : Comparing two given strings
public class Main {
public static void main(String[] args) {
String myStr1 = "PrepInsta";
String myStr2 = "PrepInsta";
System.out.println(myStr1.compareTo(myStr2)); // Returns 0 because they are equal
}
}
Output
0
Examples : Comparing two given strings
public class Main {
public static void main(String[] args) {
String myStr1 = "PrepInsta";
String myStr2 = "PrepInsta Prime";
System.out.println(myStr1.compareTo(myStr2)); // Returns negative value
}
}
Output
-6
Examples : Comparing two given strings
public class Main {
public static void main(String[] args) {
String myStr1 = "PrepInsta Prime";
String myStr2 = "PrepInsta";
System.out.println(myStr1.compareTo(myStr2)); // Returns Positive value
}
}
Output
7
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