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Array

API

Note

Here, I have listed some commonly used generic methods. For the complete methods, please refer to Javadocs

Class Arrays

Attention

All method in class Arrays are static method!

  • static <T> List<T> asList(T... a): Returns a fixed-size list backed by the specified array.
  • static <T> int binarySearch(T[] a, int fromIndex, int toIndex, T key, Comparator<? super T> c): Searches a range of the specified array for the specified object using the binary search algorithm.
  • static <T> int binarySearch(T[] a, T key, Comparator<? super T> c): Searches the specified array for the specified object using the binary search algorithm.
  • static <T> T[] copyOf(T[] original, int newLength): Copies the specified array, truncating or padding with nulls (if necessary) so the copy has the specified length.
  • static <T> T[] copyOfRange(T[] original, int from, int to): Copies the specified range of the specified array into a new array.
  • static void fill(Object[] a, int fromIndex, int toIndex, Object val): Assigns the specified Object reference to each element of the specified range of the specified array of Objects.
  • static void fill(Object[] a, Object val): Assigns the specified Object reference to each element of the
  • static <T> void sort(T[] a, Comparator<? super T> c): Sorts the specified array of objects according to the order induced by the specified comparator.
Example

For a 2-d array, sort the array based on the RHS of each 'interval'
Arrays.sort(intervals, (a,b) -> Integer.compare(a[1], b[1]));

  • static <T> void sort(T[] a, int fromIndex, int toIndex, Comparator<? super T> c): Sorts the specified range of the specified array of objects according to the order induced by the specified comparator.
  • static String toString(Object[] a): Returns a string representation of the contents of the specified array.

Class Array

  • static Object get(Object array, int index): Returns the value of the indexed component in the specified array object.

Reference