How to initialize an array in Java

Question

I am initializing an array like this   public class Array        int data     new int 10            Creates a new instance of Array        public Array             data 10     10 20 30 40 50 60 71 80 90 91                  NetBeans points to an error at this line    data 10     10 20 30 40 50 60 71 80 90 91     How can I solve the problem

User · Answer

Maybe this will work   public class Array        int data     new int 10           Creates a new instance of Array        public Array             data   10 20 30 40 50 60 71 80 90 91

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When you create an array of size 10 it allocated 10 slots but from 0 to 9  This for loop might help you see that a little better   public class Array       int   data   new int 10            Creates a new instance of an int Array        public Array             for int i   0  i  lt  data length  i                  data i    i 10

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you are trying to set the 10th element of the array to the array try   data   new int    10 20 30 40 50 60 71 80 90 91     FTFY

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Rather than learning un-Official websites learn from oracle website  link follows Click here   You can find Initialization as well as declaration with full description    int n     size of array here 10 int   a   new int n   for  int i   0  i  lt  a length  i          a i    Integer parseInt s nextLine        using Scanner class     Input  10  array size 10 20 30 40 50 60 71 80 90 91  Displaying data   for  int i   0  i  lt  a length  i           System out println a i              Output  10 20 30 40 50 60 71 80 90 91

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You can do   int   data    10 20 30 40 50 60 71 80 90 91

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You cannot initialize an array like that  In addition to what others have suggested  you can do    data 0    10  data 1    20      data 9    91

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If you want to initialize an array in a constructor  you can t use those array initializer like   data   10 20 30 40 50 60 71 80 90 91     Just change it to   data   new int    10 20 30 40 50 60 71 80 90 91     You don t have to specify the size with data 10    new int     10     91  Just declare the property   field with int   data  and initialize it like above  The corrected version of your code would look like the following   public class Array        int   data       public Array             data   new int    10 20 30 40 50 60 71 80 90 91              As you see the bracket are empty  There isn t any need to tell the size between the brackets  because the initialization and its size are specified by the count of the elements between the curly brackets

User · Answer

Try data   new int    10 20 30 40 50 60 71 80 90 91

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Syntax   Datatype   variable   new Datatype     value1 value2         Datatype variable      new Datatype     value1 value2         Example    int    points   new int    1 2 3 4

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data 10     10 20 30 40 50 60 71 80 90 91     The above is not correct  syntax error   It means you are assigning an array to data 10  which can hold just an element   If you want to initialize an array  try using Array Initializer   int   data    10 20 30 40 50 60 71 80 90 91       or  int   data  data   new int    10 20 30 40 50 60 71 80 90 91     Notice the difference between the two declarations  When assigning a new array to a declared variable  new must be used   Even if you correct the syntax  accessing data 10  is still incorrect  You can only access data 0  to data 9  because index of arrays in Java is 0-based   Accessing data 10  will throw an ArrayIndexOutOfBoundsException

[java] How to initialize an array in Java?

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