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?
This question is related to
java
arrays
initialization
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 < 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 < a.length; i++)
{
System.out.println(a[i] + " ");
}
Output: 10 20 30 40 50 60 71 80 90 91
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;
Try data = new int[] {10,20,30,40,50,60,71,80,90,91 };
You can do:
int[] data = {10,20,30,40,50,60,71,80,90,91};
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 < data.length; i++) {
data[i] = i*10;
}
}
}
Syntax
Datatype[] variable = new Datatype[] { value1,value2.... }
Datatype variable[] = new Datatype[] { value1,value2.... }
Example :
int [] points = new int[]{ 1,2,3,4 };
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
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.
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};
}
}
Source: Stackoverflow.com