Function Description
The Java String class equalsIgnoreCase() method is used to compare the string with the specified string. It is case insensitive during the comparison. It returns boolean true/false value. Both strings will be equal if they are of the same length and corresponding characters in both the strings are the same, irrespective of the case (lowercase/uppercase).
For Example: If you have 3 String objects str1, str2 and str3 with values respectively “example”, “EXAMPLE” and “Example”, Then all objects’ values are said to be equal by this function, because all have the same length and same sequence of characters.
// string in lowercase String str1 = "example"; // string in uppercase String str2 = "EXAMPLE"; // string in camelcase String str3 = "Example";
Method Signature
public boolean equalsIgnoreCase(String anotherString)
Parameter
anotherString : another string to be compared with existing string.
Return Type
The Return Type is boolean, true if passing another String have the same length and same sequence of characters irrespective case of the character(s).
Example of Java String Class equalsIgnoreCase() Method
package com.java.test; public class ExampleStringEqualIgnoreCase { private void areStringsEqualsInIgnoreCase(String stringParam) { // string in lowercase String str1 = "example"; // string in uppercase String str2 = "EXAMPLE"; // string in camelcase String str3 = "Example"; // Both strings are in lowercase, check for equality System.out.println("Both strings are in lowercase. check if both are equal : " + stringParam.equalsIgnoreCase(str1)); // One string in lowercase and one in uppercase. check equality System.out.println("One string in lowercase and one in uppercase.check if both are equal : " + stringParam.equalsIgnoreCase(str2)); // One string in lowercase and one in camelcase. check equality System.out.println("One string in lowercase and one in camelcase. check if both are equal : " + stringParam.equalsIgnoreCase(str3)); } public static void main(String[] args) { String str = "example"; ExampleStringEqualIgnoreCase example = new ExampleStringEqualIgnoreCase(); System.out.println("//check strings equality by equalsIgnoreCase "); example.areStringsEqualsInIgnoreCase(str); } } Output: //check strings equality by equalsIgnoreCase Both strings are in lowercase. check if both are equal : true One string in lowercase and one in uppercase.check if both are equal : true One string in lowercase and one in camelcase. check if both are equal : true
Other Methods of String Class
Sequence | Method | Description |
1 | char charAt(int index) | This method is used to return the character of the string at specified index. First character is at index 0 while last is at string length-1 . StringIndexOutOfBounds Exception is thrown if valid index value is not passed. |
2 | int length() | Returns the number of characters count in a string. |
3 | static String format(String format, Object… args) | Return the formatted String. It is a static method and formats the string as per passing format and argument(s). |
4 | static String format(Locale l, String format, Object… args) | Return the formatted String. It is a static method and formats the string as per passing format and argument(s) and locale. |
5 | String substring(int beginIndex) | Returns substring from the given index position to the end index of the string. |
6 | String substring(int beginIndex, int endIndex) | Returns substring from the specified begin index to the specified end index. |
7 | boolean contains(CharSequence s) | Returns boolean value(true/false). It searches the given sequence of characters within the string and returns true/false accordingly. Characters will be case sensitive while searching in string. |
8 | static String join(CharSequence delimiter, CharSequence… elements) | Returns joined string. This method joins each passing String using the specified delimiter. It is a static method. |
9 | static String join(CharSequence delimiter, Iterable<? extends CharSequence> elements) | Returns the joined string. This method joins each passing string object of an iterate object using the specified delimiter and returns the concatenated string. It is a static method. |
10 | boolean equals(Object another) | Returns boolean value(true/false). It checks the equality of string with the passing object. |
11 | boolean isEmpty() | Returns boolean value(true/false). It returns true if the string is empty otherwise returns false. |
12 | String concat(String str) | Returns the concatenating string. It concatenates the passing string at the end of the string. |
13 | String replace(char old, char new) | Return the replaced string. It replaces all occurrences of the specified character with the new character. |
14 | String replace(CharSequence old, CharSequence new) | Return the replaced string. It replaces all occurrences of the specified Character sequence with the specified new Character sequence. |
15 | String replaceAll(String regex, String replacement) | Returns the replaced string. It replaces all occurrences of the sequence of characters with the given replacement string that are matching with the given regular expression. |
16 | String replaceFirst(String regex, String replacement) | Returns the replaced string. It replaces the first matching sequence of characters with the replacement string that matches with the given regular expression. |
17 | String[] split(String regex) | Returns the array of strings resulting from splitting of the string around matches of the given regular expression. String is breaked into strings from all the matching regular expressions. |
18 | String[] split(String regex, int limit) | Returns the array of strings resulting from splitting of the string around matches of the given regular expression. It breaks the string from all the matching regular expression upto the given limit. |
19 | String intern() | Returns an interned string. This method helps to compare two objects using == operator and checks in a string constant pool. it is faster for comparison. |
20 | int indexOf(int ch) | Returns the index value of first occurrence of the specified character within the string |
21 | int indexOf(int ch, int fromIndex) | Returns the index value of first occurrence of the specified character from the substring starting from specified index |
22 | int indexOf(String substring) | Returns the index value of first occurrence of the specified substring within the string. |
23 | int indexOf(String substring, int fromIndex) | Returns the index value of the first occurrence of the specified string within the substring starting from specified index to end of the string index. |
24 | int lastIndexOf(int ch) | Returns the index value of last occurrence of the specified character |
25 | int lastIndexOf (int ch, int fromIndex) | Returns the index value of last occurrence of the specified character, search starts at given fromIndex. |
26 | int lastIndexOf (String str) | Returns the index value of last occurrence of the specified string. |
27 | int lastIndexOf (String str, int fromIndex | Returns the index value of last occurrence of the specified string, searches start from given fromIndex |
28 | String toLowerCase() | Returns all the characters of the string in lowercase . |
29 | String toLowerCase(Locale l) | Returns all the characters of the string in lowercase using specified locale. |
30 | String toUpperCase() | Returns all the characters of the string in uppercase. |
31 | String toUpperCase(Locale l) | Returns all the characters of the string in uppercase using specified locale. |
32 | String trim() | Returns the string after removing the white space from the beginning and end of the string. |
33 | static String valueOf(int value) | Return the converted string. It converts the objects and all primitive types of values into string. It is a static method. |
In this article, we learned all about the equlasIgnoreCase() method of String class with examples. Apart from equlasIgnoreCase() method we got an idea about other String methods too. We will come up with more articles explaining other String methods with examples. For more details please click on the respective methods link.
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