How do I fill arrays in Java?

William_62122 0
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I know how to do it normally, but I could swear that you could fill out out like a[0] = {0,0,0,0}; How do you do it that way? I did try Google, but I didn't get anything helpful.

arrays java
8 Answers

Check out the Arrays.fill methods.

int[] array = new int[4];
Arrays.fill(array, 1); // [1, 1, 1, 1]
cdmckay_625710

You can also do it as part of the declaration:

int[] a = new int[] {0, 0, 0, 0};
user_416650

Arrays.fill(). The method is overloaded for different data types, and there is even a variation that fills only a specified range of indices.

Zach_Scrivena_200290

An array can be initialized by using the new Object {} syntax.

For example, an array of String can be declared by either:

String[] s = new String[] {"One", "Two", "Three"};
String[] s2 = {"One", "Two", "Three"};

Primitives can also be similarly initialized either by:

int[] i = new int[] {1, 2, 3};
int[] i2 = {1, 2, 3};

Or an array of some Object:

Point[] p = new Point[] {new Point(1, 1), new Point(2, 2)};

All the details about arrays in Java is written out in Chapter 10: Arrays in The Java Language Specifications, Third Edition.

coobird_171720

Array elements in Java are initialized to default values when created. For numbers this means they are initialized to 0, for references they are null and for booleans they are false.

To fill the array with something else you can use Arrays.fill() or as part of the declaration

int[] a = new int[] {0, 0, 0, 0};

There are no shortcuts in Java to fill arrays with arithmetic series as in some scripting languages.

staffan_9880
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