In Java, equalsIgnoreCase() method of the String class compares two strings irrespective of the case (lower or upper) of the string. This method returns a boolean value, true if the argument is not null and represents an equivalent String ignoring case, else false.
Syntax of equalsIgnoreCase()
str2.equalsIgnoreCase(str1);
Parameters
- str1: A string that is supposed to be compared.
Return Value
- A boolean value that is true if the argument is not null and it represents an equivalent String ignoring case, else false.
Illustration
Input : str1 = "pAwAn";
str2 = "PAWan"
str2.equalsIgnoreCase(str1);
Output :true
Input : str1 = "powAn";
str2 = "PAWan"
str2.equalsIgnoreCase(str1);
Output :false
Explanation: powan and pawan are different strings.
Note: str1 is a string that needs to be compared with str2.
Internal Implementation of the equalsIgnoreCase() Method
public boolean equalsIgnoreCase(String str)
{
return (this == str) ? true
: (str != null)
&& (str.value.length == value.length)
&& regionMatches(true, 0, str, 0, value.length);
}
Example of String equalsIgnoreCase() Method
Java
// Java Program to Illustrate equalsIgnoreCase() methodÂ
// Importing required classesimport java.lang.*;Â
// Main classpublic class GFG {    // Main driver method    public static void main(String[] args)    {        // Declaring and initializing strings to compare        String str1 = "GeeKS FOr gEEks";        String str2 = "geeKs foR gEEKs";        String str3 = "ksgee orF geeks";Â
        // Comparing strings        // If we ignore the cases        boolean result1 = str2.equalsIgnoreCase(str1);Â
        // Both the strings are equal so display true        System.out.println("str2 is equal to str1 = "                           + result1);Â
        // Even if we ignore the cases        boolean result2 = str2.equalsIgnoreCase(str3);Â
        // Both the strings are not equal so display false        System.out.println("str2 is equal to str3 = "                           + result2);    }} |
Output
str2 is equal to str1 = true str2 is equal to str3 = false
