Learn java-chapter 1 variable (Variables)-Array (Arrays)

The Java array determines the length of the array when it is created. Index subscript starting from 0.

1. Array definition and initialization

int[] anarray;//Definition Anarray = new int[2];//initialization anarray[0] = 100;//Assignment anarray[1] = 200;//Assignment System.out.println ("Element at IND Ex 0: "+ anarray[0]);//Use SYSTEM.OUT.PRINTLN (" Element at index 1: "+ anarray[1]);//Use

Program output:

Element at index 0:100element at index 1:200

2. Define initialization and assign values at the same time

Int[] Anarray = {100, 200, 300, 400, 500, 600, 700, 800, 900, 1000};

3. Multidimensional arrays

String[][] names = {"Mr.", "Mrs.", "Ms."}, {"Smith", "Jones"}; System.out.println (Names[0][0] + names[1][0]); System.out.println (Names[0][2] + names[1][1]);

Program output:

Mr smithms. Jones

As can be seen from the above example, the length of each row array in a Java multidimensional array does not require equality.

4. Copying an array

Class Arraycopydemo {public static void main (string[] args) {char[] CopyFrom = {' d ', ' e ', ' C ', ' A ', ' f ', ' F ',        ' E ', ' I ', ' n ', ' a ', ' t ', ' e ', ' d '};        char[] CopyTo = new CHAR[7];        System.arraycopy (CopyFrom, 2, CopyTo, 0, 7);    System.out.println (New String (CopyTo)); }}

Program output:

Caffein

Learn java-chapter 1 variable (Variables)-Array (Arrays)