Java String Class

Java String Class - 16 Cards

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Reference variable

Stores memory address of an object

String class

Represents a sequence of characters

Concatenating strings

+ operator is used to concatenate two strings

charAt(index)

Returns the character at specified index

length()

Returns the length of the string

substring(int startIndex, int endIndex)

Returns a substring of a string, starting at startIndex and ending at the endIndex - 1

toLowerCase()

Returns a new string with all the characters in lower case

toUpperCase()

Returns a new string with all the characters in upper case

trim()

Returns a new string with leading and trailing whitespace removed

indexOf(String str)

Returns the index of the first occurrence of the string, or -1 if the string is not found.

contains(String str)

Returns true if the string contains the specified string, false otherwise.

replace(CharSeq oldStr, CharSeq newStr)

Returns a new string with all occurrences of the specified string replaced by the new string.

isEmpty()

Checks if a String is empty or not.

endsWith()

Checks if a string ends with specified suffix

startsWith()

Checks if a string starts with specified prefix

StringBuffer

Mutable string used to manipulate strings with operations like append, delete and insert