Thread: What is wrong with my code? pls help!

Welcome to the Forum! Please read this topic to learn how to post code correctly and other useful tips for newcomers.

Please post your code correctly per the above link, preferably without line numbers.

Not really. You've made an effort, and I appreciate it, but using code tags does not require as much effort. Please read the link I provided and see the part about code tags near the top, the first item I think.

As for your code problem, I cleaned up your code so that I could test it, but I don't believe I changed the substance, and I don't have the error you are showing. Note that by convention in Java, class names are capitalized. Here's my version of your code, properly posted:

import java.util.Scanner;
 
public class Apples
{
    public static void main (String args[])
    {
        Scanner input = new Scanner (System.in);
        Tuna tunaObject = new Tuna ();
 
        System.out.println("Enter name of first gf here: ");
        String temp = input.nextLine();
        tunaObject.setName(temp);
        tunaObject.saying();
    }
}
 
class Tuna
{
    private String girlName;
    public void setName(String name){
        girlName=name;
 
    }
    public String getName(){
        return girlName;
    }
    public void saying(){
        System.out.printf("Your first gf was %s", getName());
    }
}

thank you for the effort but unfortunately im still getting the same problem, eclipse tells me that printf is used for (string, object) instead of (string, args) which is what i think it should be. i dont know how to fix this because im only a learner, is it to do with the version of eclipse/jdk?

I'm stumped. What version of Eclipse and JDK are you using? Unless really old - and I can't imagine how old - the code I posted should work without error.

Have you successfully completed the typical "HelloWorld.java" application to ensure your environment is correctly configured? If you have the HelloWorld.java source code available that already works with a println() method, try changing the program to use a printf() statement, like this:

System.out.printf( "%s\n", "Hello World." );

This is the info i got about eclipse:

Eclipse Java EE IDE for Web Developers.
Version: Kepler Service Release 2
Build id: 20140224-0627

For the JDK, using "java -version" in command prompt:

java version "1.8.0_053
Java (TM) SE Environment (build 1.8.0_05-b13)
Java hotspot (TM 64-Bit Server VM (build 25.5-b°2, mixed mode).

I ran a simple "hello world" application which worked with both printf and println.

--- Update ---

Little update, i put the code into notepad and ran it through command prompt and the program worked, no problem so there must be some problem with eclipse.

Even more confused now that your HelloWorld program works with both.

There is a plugin (or a Java 8 update, forget what it was called) to enable Eclipse to work with Java 8. You might find and try that.

eclipse marketplace doesnt work for some reason, should i consider uninstalling java 8 and go for java 7?

I tested on my Eclipse and it ran fine (after fixing semicolon)

Originally Posted by nikolaiL

eclipse marketplace doesnt work for some reason, should i consider uninstalling java 8 and go for java 7?

You shouldn't have to. Were you following these instructions?

oh... i uninstalled java 8 iin the meantime unfortunately.

--- Update ---

oh no, ive really dug a hole for myself now, ive managed to uninstall actual java from my computer, this means for example i cant launch a game like minecraft, this is really serious. do you know what i can do?

Don't waste time playing Minecraft? That's probably not what you wanted.

Why don't you reinstall Java? Download the correct version or install package from Oracle and install it.

i did but it doesnt work. minecraft doesnt work (using this only as an example because its uses java) and the java test applet on java.com doesnt work.

--- Update ---

it seems we're back at the start, after re-installing everything i still get the problem with printf.

--- Update ---

i think eclipse just isnt working.

--- Update ---

https://bugs.eclipse.org/bugs/show_bug.cgi?id=89912

im not really sure what you mean for the first question. For the other question are you talking about the java compiler compliance? if so its level is 1.7.

Originally Posted by Norm

I could not find a definition for this method: printf(String, String) with those args.

Im not that sure what you mean, in my args ive put a string followed by another string and ive followed this code from a thenewboston.org tutorial, where it works.

--- Update ---

Originally Posted by Norm

I was asking about the java program that executes the code, NOT the compiler.

The error message looks like it happens when a class file was being executed. The java program found a reference to this definition for the method printf(String, String) in the class file it was trying to execute, but it could only find this definition for that method: printf(String, Object[]) in the PrintStream class it uses for execution.

I'm probably confused by the way the IDE mixes compiler errors and runtime errors.

im using eclipse, im sorry but im really very new to computer programming and im finding it hard to understand what you're asking, sorry. do you think you have a fix for this problem?

I don't really know what or how i did it but i re-installed eclipse and now i dont have a printf problem.

--- Update ---

Originally Posted by Norm

Look at the API doc for that method. Are there ANY that have a String for the second arg? Copy and paste it here if you find one.

No, I do not have a fix. I'm trying to find where the definition: printf(String, String) is coming from.
The only definition I can find is: printf(String, Object[])

im really sorry but what you're saying doesnt mean anything to me, i dont know what an API is. if printf is the wrong method for (String,String) do you know the right method?

anyway, halleluiah its over!