Java - How to include 2 classes in the same file?

Question

I am trying to Include two or more classes in one file, but java just throws this error message at me! How would I include 2 or more classed in 1 file?

Exception in thread "main" java.lang.ExceptionInInitializerError
    at javaapp.main(javaapp.java:25)
Caused by: java.lang.RuntimeException: Uncompilable source code - class functions1 is public, should be declared in a file named functions1.java
    at functions1.<clinit>(javaapp.java:11)
    ... 1 more
Java Result: 1



public class functions1 {
    public String Print(String text){
        System.out.println(text);
        return text;
    }
}

public class javaapp {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        functions1 Func = new functions1();
        Func.Print("You're learning Java!!!!!");


    }

}

Either make one class a nested class of the other, or put them in two different files. — Colonel Thirty Two, Oct 03 '14 at 03:04

score 3 · Accepted Answer · answered Oct 03 '14 at 03:18

3

Juned Ahsan's answer is right but if you want use 2 classes in the same file, you have one option.Use inner class. Check this sample

public class OuterClass {
    int outerVariable = 100;

    class InnerClass {
        int innerVariable = 20;

        int someMethod(int parameter) {
           //Do something.
        }       
    }

    public static void main(String[] args) {
        OuterClass outer = new OuterClass();
        InnerClass inner = outer.new InnerClass(); 
        System.out.println(inner.someMethod(3));
    }
}

And also check this from oracle.

answered Oct 03 '14 at 03:18

Sai Ye Yan Naing Aye

6,622
12
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65

thanks man, I really appreciate it! Im learning java right now I was just a little confuzzled! – YoungerDryas Oct 03 '14 at 03:21
You're welcome. Don't feel sorry for downvote.Just ask what you want and share your answer to the others.Then you can be a StackOverflower. – Sai Ye Yan Naing Aye Oct 03 '14 at 03:26
@MaoKnight it's general practice on Stackoverflow to vote up accepted answers. – hd1 Oct 03 '14 at 03:45
Note, You can have two public classes. class InnerClass can also be public because it's a nested class. It will however still create two .class files – Edward J Beckett Oct 03 '14 at 04:03
@MaoKnight See [nested classes](http://stackoverflow.com/questions/70324/java-inner-class-and-static-nested-class) ;) – Edward J Beckett Oct 03 '14 at 04:08

score 1 · Answer 2 · answered Oct 03 '14 at 03:04

1

You can only have one public class in a compilation unit or .java file. Your code should give the desired output if you just take the public specifier out of your functions1 class

public class functions1 {

convert to

class functions1 {

answered Oct 03 '14 at 03:04

Juned Ahsan

67,789
12
98
136

score -1 · Answer 3 · answered Oct 03 '14 at 03:56

-1

Sir you should use inner class it is a better option where you can access you class fields privately and your class code will be separate

answered Oct 03 '14 at 03:56

Ashik Ali

11
3

An inner class has its uses, but I would be far from calling it a "better" option. – Makoto Oct 03 '14 at 04:01

Java - How to include 2 classes in the same file?

3 Answers3