Java Initialize an int array in a constructor

Question

I have a class and in that class I have this      some code  private int   data   new int 3      some code   Then in my constructor   public Date        data 0    0      data 1    0      data 2    0      If I do this  everything is OK  Default data values are initialized but if I instead do this   public Date        int   data    0 0 0       It says   Local variable hides a field   Why   What s the best way to initialize an array inside the constructor

User · Accepted Answer

private int   data   new int 3     This already initializes your array elements to 0  You don t need to repeat that again in the constructor   In your constructor it should be   data   new int   0  0  0

User · Answer

This is because  in the constructor  you declared a local variable with the same name as an attribute    To allocate an integer array which all elements are initialized to zero  write this in the constructor   data   new int 3     To allocate an integer array which has other initial values  put this code in the constructor    int   temp    2  3  7   data   temp    or   data   new int    2  3  7

User · Answer

The best way is not to write any initializing statements  This is because if you write  int a   new int 3  then by default  in Java all the values of array i e  a 0   a 1  and a 2  are initialized to 0  Regarding the local variable hiding a field  post your entire code for us to come to conclusion

User · Answer

You could either do   public class Data       private int   data       public Data             data   new int   0  0  0             Which initializes data in the constructor  or   public class Data       private int   data   new int   0  0  0        public Data                data already initialised           Which initializes data before the code in the constructor is executed

User · Answer

why not simply   public Date        data   new int   0 0 0       the reason you got the error is because int   data       declares a new variable and hides the field data  however it should be noted that the contents of the array are already initialized to 0  the default value of int

User · Answer

in your constructor you are creating another int array    public Date      int   data    0 0 0         Try this    data    0 0 0     NOTE  By the way you do NOT need to initialize your array elements if it is declared as an instance variable  Instance variables automatically get their default values  which for an integer array  the default values are all zeroes   If you had locally  declared array though they you would need to initialize each element

[java] Java Initialize an int array in a constructor

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