Question

I am developing a project in java in which ,after running main file , some java files get altered and if i run that file again during the same execution the output does not show the changes done in the java file

For example there are 2 files. Main.java and file1.java

main.java

public static void main(string[] argv)
{

    file1 obj = new file1();
    obj.view();
        Scanner in = new Scanner(System.in);
        String x = in.nextLine();
    //before entering any value i manually updated the content of file1.java
    obj = new file1();
    obj.view();
}

file1.java (Before updation)

public class file1
{

    public void view()
    {

        system.out.println("This is test code!!");
    }


}

file1.java (After updation)

public class file1
{

    public void view()
    {

        system.out.println("That was done for Testing!!");
    }


}

Output :
This is test code!!

This is test code!!

Answer 1

You have to recompile the code in order to see the changes.

What you can do is compile a string (after reading it from the file) with java and call methods of classes through reflection.

HERE is a step by step guide on how to compile a string programatically.