declaring variables

[jessie mccarty]

i need help plsss

i have ths code

import java.util.*;
 
public class sample{
public static void main(String[] args) {


ClassTwo x = new ClassTwo();
x.f(3);
ClassTwo y = x;
y.g(6);

System.out.print(x.getValue() + "");
System.out.print(y.getValue());
}
}
 
public class ClassTwo{
private int n;
 public void f(int n) {
 this.n = 7;
 }
public void g(int n) {
this.n = n;
}
public int getValue() {
return n +1;
}
}
 

  

and for some reason im getting an error stating

class ClassTwo is public, should be declare in the file name classTwo.java

any ideas.??? did i already declare it right?

[Rikard Qvarforth]

Well you already have one class taht is public make the ClassTwo package.
But i should suggest that you put the class ClassTwo in a new file makees it more clear. .

regards Rille
[ December 03, 2005: Message edited by: Rikard Qvarforth ]

[Keith Lynn]

You are only allowed to have one public class in a source file, and the name of the source file must match the public class name.

[jessie mccarty]

I made the source file the same, but im still getting the same error =(

[fred rosenberger]

just to be clear...

you have TWO separate files, one named "sample.java". this file should only have the code for the sample class.

you have a second file, named "ClassTwo.java" (and yes, the case DOES matter for both these filenames).

is this correct?

[jessie mccarty]

so do i need to take it out..actually what im trying to get form this is the result.. this is an exercise that i need to modify to get thr right result.. so what should i do?

thanks much

[marc weber]

Originally posted by jessie mccarty:
so do i need to take it out...

Yes, if both class definitions are public, then they each need to be in their own separate file, just as fred described above.

[jessie mccarty]

import java.util.*;
 
public class TestTwo{
public static void main(String[] args) {


ClassTwo x = new ClassTwo();
x.f(3);
ClassTwo y = x;
y.g(6);

System.out.print(x.getValue() + "");
System.out.print(y.getValue());
}
}
  

so the code will be then like this?
still getting an error " class or interface expected"

[marc weber]

Originally posted by jessie mccarty:
...so the code will be then like this? ...

Not quite. That looks like the class definition for "sample" with its name changed to TestTwo. Basically, you just need to separate what you had in your original post...

[B]// file ClassTwo.java[/B]
public class ClassTwo{
  private int n;
  public void f(int n) {
    this.n = 7;
  }
  public void g(int n) {
    this.n = n;
  }
  public int getValue() {
    return n +1;
  }
}
 
[B]// file Sample.java[/B]
public class Sample{
  public static void main(String[] args) {
    ClassTwo x = new ClassTwo();
    x.f(3);
    ClassTwo y = x;
    y.g(6);
    System.out.println(x.getValue() + "");
    System.out.println(y.getValue());
  }
}

Note: By convention, class names are capitalized -- e.g., Sample.

[jessie mccarty]

i separate them but still error " class or interface expected"

[marc weber]

Originally posted by jessie mccarty:
i separate them but still error " class or interface expected"

Can you post your current code? The code in my examples compile and run fine.

[fred rosenberger]

also, post the exact error message. it should refer to the line where the error occurs.

[jessie mccarty]

soory for the late respond...actually the codes are compiling, when i tried to execute it, it gives me "Exception in main "thred" java.lang.NoSuchMethodError": main"
what does it mean?

[Jesper de Jong]

It means you don't have your classpath setup correctly.
Try running your program with:

java -cp . TestTwo

See the following tutorial for a step by step explanation: First Steps for Microsoft Windows