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Good programmer big data tutorials share practical arrays of big data

1.5.1 Array definition and element access

An array is a container that stores a specified data type.

Note:

An array is a container of fixed length. Once the instantiation is completed, the length cannot be modified.

The noun explains:

Array length: refers to the capacity of the container, indicating how many data elements can be stored in the array: refers to the data subscript stored in the array: an element is indexed in a position in the array to traverse the array: get each element in the array in turn

Element access to array

Accessed by subscript, the subscript of the elements in the array starts at 0

The subscript of the element in the array: [0, array .length-1]

Note:

When accessing the elements in the array, pay attention to the range of the subscript, do not cross the boundary!

Traverse the array:

Use looping through the subscript

Int [] array = {1,2,3}; for (int index = 0; index < array.length; index++) {System.out.println (index);}

Use enhanced for loops

Int [] array = {1,2,3}; for (int ele: array) {System.out.println (ele);} memory analysis of 1.5.2 array common operations of 1.5.3 array 1.5.4 array sort

Select sort

Fix a subscript, and then compare the elements corresponding to this subscript with the elements of each subscript that follow.

Int [] array = {1,3,5,7,9,0,8,6,4,2}; for (int index = 0; index < array.length-1; index++) {for (int compare = index+ 1; compare < array.length; compare++) {if (array [index] < array [compare]) {int temp = array [index]; array [index] = array [compare]; array [compare] = temp }}}

Bubbling sort

Compare two adjacent elements in an array in turn

Int [] array = {1, 3, 5, 7, 9, 0, 8, 6, 4, 2}; for (int I = 0; I < array.length; iDeposit +) {for (int j = 0; j < array.length-1-I; jaun +) {if (array [j] < array [j + 1]) {int temp = array [j]; array [j] = array [j + 1] Array [j + 1] = temp;}} 1.5.5 array element lookup

Query the subscript that appears for the specified element from an array

Sequential search binary search 1.5.6 two-dimensional array

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