Data operation related function notes

Data operation related function notes

1, array replication function

System.ArrayCopy ()

System.ArrayCopy (source array, 0, target array, 0, copy length)

Example:

Public Class Testarrcopy

{

Public static void main (string [] args)

{

INT IA [] = new int {1, 2, 3, 4, 5};

INT IB [] = new int {9, 8, 7, 6, 5, 4, 3, 2};

System.ArrayCopy (IA, 0, IB, 0, 3);

// Copy the three elements from the subscript 0 to the array IB from the subscript 0 and start storage from the subscript 0

For (int i = 0; i

System.out.print (IA [i]);

For (int J = 0; j

System.out.print (IB [J]);

}

}

Results: 1234512365432

2, array sort function

Arrays.sort (array name)

Sample program:

Import java.util. *;

Class Arrsort

{

Public static void main (string [] args)

{

INT IA [] = new int {2, 9, 3, 6, 7, 4};

Arrays.Sort (IA);

For (int i = 0; i

System.out.print (IA [i]);

}

}

Results: 234679

3, array comparison function (not element comparison)

Arrays.equals (array 1, array 2)

Sample program:

Import java.util. *;

Class EQU

{

Public static void main (string [] args)

{

INT IA [] = new int {1,2};

INT IB [] = new int in {1, 2};

IF (Arrays.Equals (IA, IB))

System.out.println ("IA [] Equals IB []");

Else

System.out.println ("IA [] NOT Equals IB []");

}

}

Result: IA [] Equals IB []