List of All the String Methods used in Apex

Here is the list of all the string methods used in Salesforce Apex programming with examples.

charAt(index): Returns the character at the specified index.

String str = 'CRSINFOSOLUTIONS'; 
System.debug(str.charAt(2)); // Outputs 'S' because count starts from '0'.

codePointAt(index): Returns the Unicode code point value of the character at the specified index.

String str = 'Hello'; 
System.debug(str.codePointAt(1)); // Outputs the Unicode code point of 'e'

compareTo(anotherString): Compares two strings lexicographically.

String str1 = 'CRS'; String str2 = 'Info Solutions'; System.debug(str1.compareTo(str2)); // Outputs a negative number because 'CRS' is lexicographically less than 'Info Solutions'

compareToIgnoreCase(anotherString): Compares two strings lexicographically, ignoring case differences.

String str1 = 'CRS'; 
String str2 = 'Crs'; 
System.debug(str1.compareToIgnoreCase(str2)); // Outputs 0 because they are equal ignoring case

concat(str): Concatenates the specified string to the end of this string.

String str1 = 'Salesforce'; 
String str2 = ' Training'; 
System.debug(str1.concat(str2)); // Outputs 'Salesforce Training'

contains(seq): Returns true if and only if this string contains the specified sequence of char values.

String str = 'Hello World'; 
System.debug(str.contains('World')); // Outputs true

endsWith(suffix): Tests if this string ends with the specified suffix.

String str = 'Hello World'; 
System.debug(str.endsWith('World')); // Outputs true

equals(anotherString): Compares this string to the specified object.

String str1 = 'CRS'; 
String str2 = 'CRS'; 
System.debug(str1.equals(str2)); // Outputs true

equalsIgnoreCase(anotherString): Compares this String to another String, ignoring case considerations.

String str1 = 'Salesforce'; 
String str2 = 'salesForce'; 
System.debug(str1.equalsIgnoreCase(str2)); // Outputs true

format(formatString, args): Returns a formatted string using the specified format string and arguments.

String formatStr = 'Name: {0}, Age: {1}'; 
String formattedStr = String.format(formatStr, new List<String>{'John', '30'}); System.debug(formattedStr); // Outputs 'Name: John, Age: 30'

indexOf(ch): Returns the index within this string of the first occurrence of the specified character.

String str = 'Hello'; 
System.debug(str.indexOf('e')); // Outputs 1

isBlank(): Returns true if the specified string is white space, empty (”), or null; otherwise, returns false.

String str = ' '; 
System.debug(str.isBlank()); // Outputs true

isEmpty(): Returns true if the specified string is empty (”); otherwise, returns false.

String str = ''; 
System.debug(str.isEmpty()); // Outputs true

lastIndexOf(ch): Returns the index within this string of the last occurrence of the specified character.

String str = 'Hello'; 
System.debug(str.lastIndexOf('l')); // Outputs 3

length(): Returns the length of this string.

String str = 'Hello'; 
System.debug(str.length()); // Outputs 5

replace(oldChar, newChar): Returns a new string resulting from replacing all occurrences of oldChar in this string with newChar.

String str = 'Hello'; 
System.debug(str.replace('l', 'p')); // Outputs 'Heppo'

replaceAll(regex, replacement): Replaces each substring of this string that matches the given regular expression with the given replacement.

String str = 'Hello World'; 
System.debug(str.replaceAll('l', 'p')); // Outputs 'Heppo Worpdp'

replaceFirst(regex, replacement): Replaces the first substring of this string that matches the given regular expression with the given replacement.

String str = 'Hello World'; 
System.debug(str.replaceFirst('l', 'p')); // Outputs 'Heplo World'

split(regex): Splits this string around matches of the given regular expression.

String str = 'Salesforce Course'; 
List<String> parts = str.split(' '); 
System.debug(parts); // Outputs '(Salesforce, Course)'

startsWith(prefix): Tests if this string starts with the specified prefix.

String str = 'Hello World'; 
System.debug(str.startsWith('Hello')); // Outputs true

substring(beginIndex, endIndex): Returns a new string that is a substring of this string.

String str = 'CRS Salesforce'; 
System.debug(str.substring(0, 2)); // Outputs 'CRS'

toLowerCase(): Converts all of the characters in this String to lower case.

String str = 'SALESFORCE'; 
System.debug(str.toLowerCase()); // Outputs 'salesforce'

toUpperCase(): Converts all of the characters in this String to upper case.

String str = 'hello'; 
System.debug(str.toUpperCase()); // Outputs 'HELLO'

trim(): Returns a copy of the string, with leading and trailing whitespace omitted.

String str = ' Salesforce training '; 
System.debug(str.trim()); // Outputs 'Salesforce training'

valueOf(obj): Returns the string representation of the passed object.

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