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Java String Methods

Java String split()

Splits the string at the specified string (regex)

Java String compareTo()

Compares two strings in the dictionary order

Java String compareToIgnoreCase()

Compares two strings ignoring case differences

Java String length()

Returns the length of the string

Java String replace()

Replace all matching characters/text in the string

Java String replaceAll()

Replace all substrings matching the regex pattern

Java String substring()

Returns a substring from the given string

Java String equals()

Compares two strings

Java String equalsIgnoreCase()

Compares two strings ignoring case differences

Java String contains()

Checks whether the string contains a substring

Java String indexOf()

Returns the index of the character/substring

Java String trim()

Removes any leading and trailing whitespace

Java String charAt()

Returns the character at the given index

Java String toLowerCase()

Converts characters in the string to lower case

Java String concat()

Concatenates two strings and returns it

Java String valueOf()

Returns the string representation of a value

Java String matches()

checks whether the string matches the given regex

Java String startsWith()

Checks if the string begins with the given string

Java String endsWith()

Checks if the string ends with the given string

Java String isEmpty()

Checks whether a string is empty or not

Java String intern()

Returns a canonical representation of the string

Java String getBytes()

Encodes the string into a sequences of bytes

Java String contentEquals()

Checks whether the string is equal to charSequence

Java String hashCode()

Returns a hash code for the string

Java String join()

Joins the given strings using the delimiter

Java String replaceFirst()

Replace the first matching substring

Java String subSequence()

Returns a subsequence from the string

Java String toCharArray()

Converts the string to a char array

Java String format()

Returns a formatted string

Java ArrayList Methods

Java ArrayList add()

inserts the element to the arraylist

Java ArrayList addAll()

adds all elements of a collection to arraylist

Java ArrayList clear()

removes all the elements from arraylist

Java ArrayList clone()

makes a copy of the array list

Java ArrayList contains()

checks if the element is present in the arraylist

Java ArrayList get()

returns the element present in the specified index

Java ArrayList indexOf()

returns the position of the specified element

Java ArrayList removeAll()

removes multiple elements from the arraylist

Java ArrayList remove()

removes the single element from the arraylist

Java ArrayList size()

returns the length of an arraylist

Java ArrayList isEmpty()

checks if the arraylist is empty

Java ArrayList subList()

returns a portion of the arraylist

Java ArrayList set()

replace the single element from an arraylist

Java ArrayList sort()

sorts the arraylist according to specified order

Java ArrayList toArray()

converts an arraylist to an array

Java ArrayList toString()

converts the arraylist into a String

Java ArrayList ensureCapacity()

set the size of an araylist

Java ArrayList lastIndexOf()

returns position of last occurrence of the element

Java ArrayList retainAll()

retains only the common elements

Java ArrayList containsAll()

checks if a collection is a subset of arraylist

Java ArrayList trimToSize()

trims the capacity of arraylist equal to the size

Java ArrayList removeRange()

removes a portion of the arraylist

Java ArrayList replaceAll()

replace all elements from the arraylist

Java ArrayList removeIf()

removes element that satisfy the condition

Java ArrayList forEach()

performs an action to all elements of arraylist

Java ArrayList iterator()

returns an iterate to loop through the ArrayList

Java HashMap Methods

Java HashMap clear()

remove all elements from HashMap

Java HashMap clone()

makes the copy of the hashmap

Java HashMap isEmpty()

checks if the HashMap is empty

Java HashMap size()

returns the number of items in HashMap

Java HashMap put()

inserts the specified item to the hashmap

Java HashMap putAll()

inserts all items from a map to HashMap

Java HashMap putIfAbsent()

inserts item if the key is not already present

Java HashMap remove()

removes the mapping for the specified key

Java HashMap containsKey()

checks if the specified key is present in HashMap

Java HashMap containsValue()

checks if HashMap contains the specified value

Java HashMap replace()

replaces the value for the specified key

Java HashMap replaceAll()

replaces all values with

Java HashMap get()

returns the value using the specified key

Java HashMap getOrDefault()

returns specified default value if key not found

Java HashMap forEach()

performs the action to all entries of HashMap

Java HashMap entrySet()

returns a set view of all entries

Java HashMap keySet()

returns a set view of all the keys of HashMap

Java HashMap values()

returns a view of all values present in HashMap

Java HashMap merge()

merges the specified mapping to the HashMaps

Java HashMap compute()

computes a new value for the specified key

Java HashMap computeIfAbsent()

computes value if mapping for key is not present

Java HashMap computeIfPresent()

computes a value for the mapping if key is present

Java Math Methods

Java Math abs()

returns the absolute value of a number

Java Math acos()

returns the arc cosine of the specified value

Java Math addExact()

adds the specified numbers and returns it

Java Math asin()

returns the arc sine of the specified argument

Java Math atan()

returns the inverse tangent function of a value

Java Math cos()

returns the cosine of the specified angle

Java Math sin()

returns the sine of the specified angle in radians

Java Math tan()

returns the tangent value of the specified angle

Java Math sinh()

returns the hyperbolic sine of the specified value

Java Math cosh()

returns hyperbolic cosine of the specified value

Java Math tanh()

returns hyperbolic tangent of the specified value

Java Math sqrt()

returns the square root of the specified number

Java Math cbrt()

returns the cube root of the specified number

Java Math pow()

returns first argument raised to power of second

Java Math subtractExact()

subtracts the specified numbers and returns it

Java Math multiplyExact()

multiplies the specified numbers and returns it

Java Math incrementExact()

adds 1 to the specified number and returns it

Java Math decrementExact()

subtracts 1 from specified number and returns it

Java Math negateExact()

negates the specified variable and returns it

Java Math toIntExact()

returns the int value from specified long argument

Java Math min()

returns the smaller value among the arguments

Java Math max()

returns the maximum value among the arguments

Java Math ceil()

rounds the specified value upward

Java Math floor()

rounds the specified value downward and returns it

Java Math round()

rounds the specified argument and returns it

Java Math toRadians()

converts angle from degree to radians

Java Math toDegrees()

converts angle from radians to degrees

Java Math atan2()

returns converting coordinates (x, y) to (r, )

Java Math copySign()

copies the sign of second argument to the first

Java Math exp()

returns e raised to power of given value

Java Math expm1()

returns e raised to power of given value minus 1

Java Math getExponent()

returns the unbiased exponent of specified number

Java Math hypot()

computes the hypotenuse of a right-angle triangle

Java Math IEEEremainder()

returns the remainder as per the IEEE 754 standard

Java Math log()

returns the natural logarithm of specified value

Java Math log10()

returns the base 10 logarithm of specified value

Java Math log1p()

returns natural logarithm of (specified value + 1)

Java Math nextAfter()

returns number adjacent to specified number

Java Math nextUp()

returns number greater than and adjacent to value

Java Math nextDown()

returns number less than and adjacent to the value

Java Math rint()

returns closest mathematical integer of the vaue

Java Math.random()

returns a random value between 0.0 and 1.0

Java Object Methods

Java Object getClass()

returns the class name of the object

Java Object hashCode()

returns the hashcode value of the object

Java Object toString()

converts an object into the string

Java Object equals()

checks if two objects are equal

Java Object clone()

creates a copy of the object

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