Java String Methods

Method	Description	Example
charAt(int index)	Returns the character at the specified index.	"Hello".charAt(1) // 'e' Try it yourself
length()	Returns the length of the string.	"Java".length() // 4 Try it yourself
substring(int start, int end)	Extracts a substring.	"Hello".substring(0, 4) // Hell Try it yourself
indexOf(String str)	Returns the first index of a substring.	"Hello".indexOf("l") // 2 Try it yourself
lastIndexOf(String str)	Returns the last index of a substring.	"Hello".lastIndexOf("l") // 3 Try it yourself
replace(char old, char new)	Replaces characters in the string.	"Java".replace('a', 'o') // Jovo Try it yourself
toUpperCase()	Converts the string to uppercase.	"java".toUpperCase() // JAVA Try it yourself
toLowerCase()	Converts the string to lowercase.	"JAVA".toLowerCase() // java Try it yourself
trim()	Removes leading and trailing spaces.	" Java ".trim() // Java Try it yourself
split(String regex)	Splits the string into an array based on a regex.	"a,b,c".split(",") // ["a", "b", "c"] Try it yourself
startsWith(String prefix)	Checks if the string starts with the prefix.	"Hello".startsWith("He") // true Try it yourself
endsWith(String suffix)	Checks if the string ends with the suffix.	"Hello".endsWith("lo") // true Try it yourself

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Method

Description

Example