What is the syntax to declare and initialize an array in java

+1 vote
I am unable to declare and initialize array in java. Can you please help?
Apr 12, 2018 in Java by Akrati
• 3,190 points

edited Apr 12, 2018 by Akrati 3,171 views

3 answers to this question.

0 votes
You can refer the following syntax for primitive data types:


int[] IntArr = new int[2];
int[] IntArr = {1,2};
int[] IntArr = new int[]{1,2};

You can refer the following syntax for classes, say string:

String[] StrArr = new String[3];
String[] StrArr = {"x","y","z"};
String[] StrArr = new String[]{"x","y","z"};

You can also declare the array first and then initialize it:



String[] StrArr;
StrArr = new String[]{"x","y","z"};










answered Apr 12, 2018 by nsv999
• 5,500 points
0 votes

One Dimensional Array

Syntax for default values:

int[] num = new int[5];
int num[] = new int[5];

Syntax with values given (variable/field initialization):

int[] num = {1,2,3,4,5};
int num[] = {1, 2, 3, 4, 5};

Multidimensional array

Declaration

int[][] num = new int[5][2];
int num[][] = new int[5][2];
answered Jul 16, 2018 by Daisy
• 8,120 points
0 votes

You can use this method:

String[] strs = IntStream.range(0, 15)  // 15 is the size
    .mapToObj(i -> Integer.toString(i))
    .toArray(String[]::new);
answered Jul 25, 2018 by samarth295
• 2,220 points

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