"Main Method Not Found" Error When Starting Program

Main method not found even if I've declared it

As said in my comments, looks like you've declared a String class among your own classes. To prove this, I've created a basic example:

class String {
}

public class CarelessMain {
    public static void main(String[] args) {
        System.out.println("won't get printed");
    }
    public static void main(java.lang.String[] args) {
        System.out.println("worked");
    }
}

If you execute this code, it will print "worked" in the console. If you comment the second main method, the application will throw an error with this message (similar for your environment):

Error: Main method not found in class edu.home.poc.component.CarelessMain, please define the main method as:

public static void main(String[] args)

Error: Main method not found in class inter333, please define the main method as: public static void main(String[] args)

You need to actually call your readFiles() method from the main class to start it and also move your class variables to be under your class declaration.

public class inter333 {

    List<String> SampleStringA = new ArrayList<String>();
    List<String> SampleStringB = new ArrayList<String>();
    File SampleStringAFile = new File("C:\\Users\\Trapper\\Desktop\\SampleStrings1ma.txt");
    File SampleStringBFile = new File("C:\\Users\\Trapper\\Desktop\\SampleStrings1mb.txt");
    BufferedReader reader = null;

    public static void main(String[] args) {
        readFiles();
    }

    /*Other methods*/
}

Java Runtime error say main method not found for all the program

1. First of all uninstall java by going into => control panel > program

2. delete java folder form your C: drive from programfile86 and programfile and if you find folder named as sun delete it as well

3. In run type appdata this will show you some folder goto each folder and delete file with name of java or sun. Do this for all the folder avilable in this directory

4. In run type regedit and goto HKEY_USER_DATA and HKEY_LOCAL_MACHINE one by one and then goto software in that delete javasoft folder if you find .. do this in both the folder

delete all the stuff mention above if you find if you don't its ok leave and move to next step.

and then restart your PC

and reinstall java

Error :: Main method not found in class

To start a java program you need the main method which not define in your code you can make it like this :

public class Test {

    public void printPhoto(int width, int height, boolean inColor) {
        System.out.println("Width = " + width + " cm");
        System.out.println("Height = " + height + " cm");
        if (inColor) {
            System.out.println("Print is Full color.");
        } else {
            System.out.println("Print is black and white.");
        }
        // printPhoto(10, 20, false); // Avoid a Stack Overflow due the recursive call
    }

    //main class
    public static void main(String[] args) {
        Test tst = new Test();//create a new instance of your class
        tst.printPhoto(0, 0, true);//call your method with some values        
    }

}

Error: main method not found in class please define the main method as: public static void main(String[] args)

I am not sure how you are executing it.

I have saved the above code as example.java in my machine and used the following commands in command prompt

For Compiling: javac example.java

For Executing: java example

Note that the main method is in example class so you have run the example class not the Box class

Edit:
Technically any java code can be compiled but for running a standalone application, the main method is needed. Even when you save the file as Box.java and compile it, there will be no compilation errors. But for running JVM needs main method. so you have to run example class not the box class

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