Java printf gives "change type to Object" error

Question

For some reason, in Eclipse, I get the error "change type of 'i' to 'Object[]'" for the "format" here:

int i = 461012;
System.out.format("The value of i is: %d%n", i);

I experience this error with JDK 7 and 8 (I tried reinstalling both in turn, and I tried the latest eclipse download, just to be safe).

I'm very confused as to why I can't use an int here. This example comes directly from the Oracle documentation for format. printf gives the same error.

Something so simple should be robust and reliable, one would think.

ON EDIT:

Sorry, here's the entire code that doesn't work for me.

public class Main {

    public static void main(String[] args) {
        int i = 461012;
        System.out.format("The value of i is: %d%n", i);

    }

}

And here's exactly what I see in Eclipse when I hover over "format" with the mouse:

The method format(String, Object[]) in the type PrintStream is not applicable for the arguments (String, int)

1 quick fix available:

Change type of 'i' to 'Object[]'.

Does that help?

Please print the exact and entire error message, and the exact code that you're using. I suspect that the problem exists in code that we're not seeing. — Hovercraft Full Of Eels, May 07 '14 at 00:52
This seems to work fine for me. Can you post your entire code an error message. (Sorry, I accidentaly made this an answer). — Anubian Noob, May 07 '14 at 00:53
I don't believe this doesn't work until you post the full stack trace and code you're using — Baby, May 07 '14 at 00:58
The variable `foo` doesnt appear anywhere in the code youve posted — Reimeus, May 07 '14 at 02:04
Works fine here. You clearly aren't showing us the actual code that fails, and without the code and the actual error message (copy/pasted, not paraphrased) we can't help you. — Jim Garrison, May 07 '14 at 02:59
Thanks. I edited my question to include the full code that doesn't work. — user3483276, May 07 '14 at 03:13
I'm terribly sorry. I changed the compiler from 1.4 to 1.5 and it works now. Why did that matter? — user3483276, May 07 '14 at 03:30
@user3483276 Because 1.4 had a different method `format` in `java.lang.System`, that's why I asked. — Elliott Frisch, May 07 '14 at 03:33
I don't know. I'm obviously very naive at all this. I'm learning. Thank you for your help. — user3483276, May 07 '14 at 04:00

score 1 · Accepted Answer · edited May 23 '17 at 12:05

1

The only reason I can think of is that the you Java compliance level set to 1.4. I think it is very probable that this is causing the observed error. Printf didn't exist in Java 1.4

Check that the Compiler compliance level is set to at least 1.5 for your project.

This answer shows how to change compliance level in Eclipse

edited May 23 '17 at 12:05

Community

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answered May 07 '14 at 03:24

coder hacker

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Did this help? If not there might be some other problem with Eclipse. Try running in console – coder hacker May 07 '14 at 03:35

Java printf gives "change type to Object" error

1 Answers1