Question

lets say i have a file MainClass.class which i think contains the following code

public class MainClass {
public static void main(String[] args) {

    App app = new App(5,17);
    app.Answer();

}
}

based on the MainClass.class i wrote a simple class called App.java, witch add 2 numbers.

public class App {
private int num1;
private int num2;
private int sum;

public App(int n1, int n2){
    num1=n1;
    num2=n2;
}

public void Answer(){
    sum=num1+num2;
    System.out.println("The sum of "+num1+" and " +num2+" is : "+sum);
}

}

my question is how can i linked them and see if its compiles if i dont know whats inside the MainClass.class

i hope my question is clear

Answer 1

I’d recommend, as Edwin Dalorzo said, to try decompiling the .class. But for what you’re doing. You would:

1. Compile App.java “javac App.java”
2. Run MainClass.class “java MainClass”

That will do what you’re trying to say.