SWEN221 - Method Flashcards

Object - hashCode()

Function: Returns an integer hash code value for the object. This value is used by hashing-based collections such as HashMap and HashSet.

Return Type: int

Object - equals(o)

Function: Compares this object to the specified object for equality. Returns true if they are considered equal.

Return Type: boolean

Object - toString()

Function: Returns a string representation of the object.

Return Type: String

List - add(e)

Function: Adds the specified element to the end of the list.

Return Type: boolean

List - addAll(c)

Function: Appends all elements from the specified collection to the end of the list.

Return Type: boolean

List - clear()

Function: Removes all elements from the list.

Return Type: None

List - contains(o)

Function: Returns true if the list contains the specified element.

Return Type: boolean

List - containsAll(c)

Function: Returns true if the list contains all elements in the specified collection.

Return Type: boolean

List - copyOf(coll)

Function: Creates an unmodifiable list containing the elements of the specified collection.

Return Type: List

List - get(index)

Function: Returns the element at the specified position in the list.

Return Type: E

List - indexOf(o)

Function: Returns the index of the first occurrence of the specified element in the list, or -1 if it is not found.

Return Type: int

List - isEmpty()

Function: Returns true if the list contains no elements.

Return Type: boolean

List - iterator()

Function: Returns an iterator over the elements in the list.

Return Type: Iterator

List - lastIndexOf(o)

Function: Returns the index of the last occurrence of the specified element in the list, or -1 if it is not found.

Return Type: int

List - of()

Function: Creates an unmodifiable empty list.

Return Type: List

List - of(elements)

Function: Creates an unmodifiable list containing the specified elements.

Return Type: List

List - remove(index)

Function: Removes the element at the specified position in the list.

Return Type: E

List - remove(o)

Function: Removes the first occurrence of the specified element from the list, if it is present.

Return Type: boolean

List - removeAll(c)

Function: Removes from the list all elements that are also contained in the specified collection.

Return Type: boolean

List - set(index, element)

Function: Replaces the element at the specified position in the list with the specified element.

Return Type: E

List - size()

Function: Returns the number of elements in the list.

Return Type: int

List - sort(c)

Function: Sorts the list according to the order imposed by the specified comparator.

Return Type: None

List - subList(fromIndex,toIndex)

Function: Returns a view of the portion of the list between the specified fromIndex, inclusive, and toIndex, exclusive.

Return Type: View - an object that shows or accesses existing data without creating a separate independent copy.

List - stream()

Function: Returns a sequential stream with the list as its source.

Return Type: Stream

List - forEach(action)

Function: Performs the given action for each element of the list.

Return Type: None

List - removeIf(filter)

Function: Removes all elements of the list that satisfy the given predicate.

Return Type: boolean

List - replaceAll(operator)

Function: Replaces each element of the list with the result of applying the given operator to that element.

Return Type: None

Set - add(e)

Function: Adds the specified element to the set if it is not already present.

Return Type: boolean

Set - addAll(c)

Function: Adds all elements in the specified collection to the set if they are not already present.

Return Type: boolean

Set - clear()

Function: Removes all elements from the set.

Return Type: None

Set - contains(o)

Function: Returns true if the set contains the specified element.

Return Type: boolean

Set - containsAll(c)

Function: Returns true if the set contains all elements in the specified collection.

Return Type: boolean

Set - copyOf(coll)

Function: Creates an unmodifiable set containing the elements of the specified collection. This is a static factory method.

Return Type: Set

Set - isEmpty()

Function: Returns true if the set contains no elements.

Return Type: boolean

Set - iterator()

Function: Returns an iterator over the elements in the set. The iteration order is not guaranteed unless the specific set implementation guarantees it.

Return Type: Iterator

Set - of()

Function: Creates an unmodifiable empty set. This is a static factory method.

Return Type: Set

Set - of(elements)

Function: Creates an unmodifiable set containing the specified elements. This is a static factory method.

Return Type: Set

Set - remove(o)

Function: Removes the specified element from the set if it is present.

Return Type: boolean

Set - removeAll(c)

Function: Removes from the set all elements that are also contained in the specified collection.

Return Type: boolean

Set - retainAll(c)

Function: Retains only the elements in the set that are also contained in the specified collection.

Return Type: boolean

Set - size()

Function: Returns the number of elements in the set.

Return Type: int

Set - stream()

Function: Returns a sequential stream with the set as its source.

Return Type: Stream

Set - forEach(action)

Function: Performs the given action for each element of the set.

Return Type: None

Set - removeIf(filter)

Function: Removes all elements of the set that satisfy the given predicate.

Return Type: boolean

Map - clear()

Function: Removes all key-value mappings from the map.

Return Type: None

Map - containsKey(key)

Function: Returns true if the map contains a mapping for the specified key.

Return Type: boolean

Map - containsValue(value)

Function: Returns true if the map maps one or more keys to the specified value.

Return Type: boolean

Map - copyOf(map)

Function: Creates an unmodifiable map containing the mappings of the specified map. This is a static factory method.

Return Type: Map

Map - entry(k, v)

Function: Creates an unmodifiable key-value entry containing the specified key and value. This is a static factory method.

Return Type: Map.Entry

Map - entrySet()

Function: Returns a set view of the key-value mappings contained in the map.

Return Type: Set>

Map - get(key)

Function: Returns the value associated with the specified key, or null if the key is not mapped.

Return Type: V

Map - getOrDefault(key, defaultValue)

Function: Returns the value associated with the specified key, or the given default value if the key is not mapped.

Return Type: V

Map - isEmpty()

Function: Returns true if the map contains no key-value mappings.

Return Type: boolean

Map - keySet()

Function: Returns a set view of the keys contained in the map.

Return Type: Set

Map - of()

Function: Creates an unmodifiable empty map. This is a static factory method.

Return Type: Map

Map - of(k,v,..k,v)

Function: Creates an unmodifiable map containing the specified key-value mappings. This is a static factory method.

Return Type: Map

Map - ofEntries(entries)

Function: Creates an unmodifiable map containing the mappings in the specified entries. This is a static factory method.

Return Type: Map

Map - put(key, value)

Function: Associates the specified value with the specified key in the map.

Return Type: V

Map - putAll(m)

Function: Copies all mappings from the specified map into this map.

Return Type: None

Map - putIfAbsent(key,value)

Function: Associates the specified value with the specified key only if the key is not already mapped or is mapped to null.

Return Type: V

Map - remove(key)

Function: Removes the mapping for the specified key from the map if it is present.

Return Type: V

Map - size()

Function: Returns the number of key-value mappings in the map.

Return Type: int

Map - values()

Function: Returns a collection view of the values contained in the map.

Return Type: Collection

Map - forEach(action)

Function: Performs the given action for each key-value mapping in the map.

Return Type: None

Map - replaceAll(function)

Function: Replaces each value in the map with the result of applying the given function to that key and value.

Return Type: None

Map - merge(key,value,remappingFunction)

Function: If the key is not already mapped or is mapped to null, associates it with the given value. Otherwise, replaces the value with the result of the remapping function.

Return Type: V

Map - compute(key,remappingFunction)

Function: Computes a new mapping for the specified key using the given remapping function.

Return Type: V

Map - computeIfAbsent(key,mappingFunction)

Function: If the specified key is not already mapped or is mapped to null, computes its value using the given mapping function and enters it into the map.

Return Type: V

Map - computeIfPresent(key,remappingFunction)

Function: If the specified key is present and mapped to a non-null value, computes a new mapping using the given remapping function.

Return Type: V

Map.Entry - getKey()

Function: Returns the key corresponding to this entry.

Return Type: K

Map.Entry - getValue()

Function: Returns the value corresponding to this entry.

Return Type: V

Math - min(a,b)

Function: Returns the smaller of the two given values.

Return Type: same type as the arguments

Math - max(a,b)

Function: Returns the larger of the two given values.

Return Type: same type as the arguments

String - codePointAt(index)

Function: Returns the Unicode code point value at the specified index.

Return Type: int

String - codePoints()

Function: Returns a stream of Unicode code point values from the string.

Return Type: IntStream

String - compareTo(anotherString)

Function: Compares two strings lexicographically.

Return Type: int

String - compareToIgnoreCase(str)

Function: Compares two strings lexicographically, ignoring case differences.

Return Type: int

String - contains(s)

Function: Returns true if the string contains the specified sequence of characters.

Return Type: boolean

String - endsWith(suffix)

Function: Returns true if the string ends with the specified suffix.

Return Type: boolean

String - equalsIgnoreCase(anotherString)

Function: Compares this string to another string, ignoring case differences.

Return Type: boolean

String - formatted(args)

Function: Returns a formatted string using this string as the format pattern and the given arguments.

Return Type: String

String - indexOf(str)

Function: Returns the index of the first occurrence of the specified substring, or -1 if it is not found.

Return Type: int

String - indexOf(str, fromIndex)

Function: Returns the index of the first occurrence of the specified substring, starting the search at the given index, or -1 if it is not found.

Return Type: int

String - isBlank()

Function: Returns true if the string is empty or contains only whitespace characters.

Return Type: boolean

String - isEmpty()

Function: Returns true if the string has length 0.

Return Type: boolean

String - lastIndexOf(str)

Function: Returns the index of the last occurrence of the specified substring, or -1 if it is not found.

Return Type: int

String - lastIndexOf(str, fromIndex)

Function: Returns the index of the last occurrence of the specified substring, searching backward starting at the given index, or -1 if it is not found.

Return Type: int

String - length()

Function: Returns the number of characters in the string.

Return Type: int

String - lines()

Function: Returns a stream of lines extracted from the string.

Return Type: Stream

String - repeat(count)

Function: Returns a string whose value is this string repeated the specified number of times.

Return Type: String

String - replace(target, replacement)

Function: Returns a new string resulting from replacing all occurrences of the target sequence with the replacement sequence.

Return Type: String

String - split(regex)

Function: Splits the string around matches of the given regular expression.

Return Type: String[]

String - startsWith(prefix)

Function: Returns true if the string starts with the specified prefix.

Return Type: boolean

String - startsWith(prefix, toffset)

Function: Returns true if the substring beginning at the specified index starts with the given prefix.

Return Type: boolean

String - substring(beginIndex)

Function: Returns a new string that begins at the specified index and continues to the end of the string.

Return Type: String

String - substring(beginIndex, endIndex)

Function: Returns a new string that contains characters from the specified begin index up to, but not including, the end index.

Return Type: String

String - toLowerCase()

Function: Returns a new string with all characters converted to lowercase.

Return Type: String

String - toUpperCase()

Function: Returns a new string with all characters converted to uppercase.

Return Type: String

String - trim()

Function: Returns a new string with leading and trailing whitespace removed.

Return Type: String

Integer - compare(x, y)

Function: Compares the two specified int values numerically.

Return Type: int