How to initialize an array in Java?

user_223706 0
Viewed 1722775

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?

initialization arrays java
11 Answers
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.

user_1655200

Try

data = new int[] {10,20,30,40,50,60,71,80,90,91 };
user_1341760

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;
        }
    }
}
user_19920

Syntax

 Datatype[] variable = new Datatype[] { value1,value2.... }

 Datatype variable[]  = new Datatype[] { value1,value2.... }

Example :

int [] points = new int[]{ 1,2,3,4 };
user_13388500

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;
user_1847300

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

user_1325530 
int myArray2[] = new int[3];
int[] myArray = new int[3];
int[] intArray = {13, 14, 15};
int[] intArray = new int[]{7, 8, 9};
int[] intArray = IntStream.range(1, 11).toArray();
int[] intArray = IntStream.rangeClosed(1, 10).toArray();
int[] intArray = IntStream.of(6, 2, 4, 5, 7).toArray();
int[] intArray = IntStream.of(6, 2, 4, 5, 7).sorted().toArray();
user_118871070
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