flashcard-java-09-ReferenceTypes.md

layout	flashcard-topic
title	Java String Class
main_card_title	Java String Class
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card_bg	#9aacd5
cards	title description Reference variable Stores memory address of an object title description String class Represents a sequence of characters title description Concatenating strings + operator is used to concatenate two strings title description charAt(index) Returns the character at specified index title description length() Returns the length of the string title description substring(int startIndex, int endIndex) Returns a substring of a string, starting at startIndex and ending at the endIndex - 1 title description toLowerCase() Returns a new string with all the characters in lower case title description toUpperCase() Returns a new string with all the characters in upper case title description trim() Returns a new string with leading and trailing whitespace removed title description indexOf(String str) Returns the index of the first occurrence of the string, or -1 if the string is not found. title description contains(String str) Returns true if the string contains the specified string, false otherwise. title description replace(CharSeq oldStr, CharSeq newStr) Returns a new string with all occurrences of the specified string replaced by the new string. title description isEmpty() Checks if a String is empty or not. title description endsWith() Checks if a string ends with specified suffix title description startsWith() Checks if a string starts with specified prefix title description StringBuffer Mutable string used to manipulate strings with operations like append, delete and insert