How to use Arrays.fill correctly

Question

I was given the following problem in class today.

Print (show result) of the following arrays:

int[ ] a = {2,4,7,10};
int[ ] b = Arrays.fill(a,7);
int[ ] c = Arrays.fill(a,1,3,8);

When i punch these lines of code into NetBeans, I get the following error:

"incompatible types - required: int[] - found: void"

Any ideas on what is not working correctly?

Have a look at the Javadoc and it will be quite clear what's going on. Btw, Javadoc is quickly accessible in Netbeans via rightclick or alt-f1 on any standard classname or method. Learn to use the Javadoc properly, it will save you lots of time and frustration. — fvu
– fvu, Commented Oct 7, 2013 at 21:21

Rohit Jain · Accepted Answer · 2013-10-07 21:24:50Z

6

Arrays#fill() doesn't return the array. It has void return type. Just use:

int[] a = {2,4,7,10};
Arrays.fill(a,7);
Arrays.fill(a,1,3,8);

edited Oct 7, 2013 at 21:24

answered Oct 7, 2013 at 21:17

Rohit Jain

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2 Comments

Swiftmatt Over a year ago

Should i be getting the following outputs after each line if i use a println after each of the three statements? [2, 4, 7, 10] [7, 7, 7, 7] [7, 8, 8, 7]

Rohit Jain Over a year ago

@user2856289 Yes. You can print the array after each fill, to see the difference.

Reimeus · Accepted Answer · 2013-10-07 21:18:51Z

5

Arrays#fill has a void return type, simply use

Arrays.fill(a,7);

edited Oct 7, 2013 at 21:18

answered Oct 7, 2013 at 21:17

Reimeus

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