java中两个不同类之间的调用参数

Question

I have two classes(in different file) and one main class. I want to use their methods and parameters (such as int) in other method but when I create each of them as new I faced "java.lang.StackOverflowError".

my purpose : Main >create class1>go to class1 and send int to class2>do sth and return result as int to class1 again and print the result.

public class Class1 {

    Class2 class2=new Class2();
    protected int b=4;
    public void start (int c)
    {
        class2.run(b);
        System.out.println("Numbber :"+c);
    }
}



public class Class2 {

    Class1 class1 = new Class1();
    protected int a=5;

    public void run(int b) {
        int c=b+10+a;
        class1.start(c);

    }
}


public class Main {

    public static void main(String[] args) {
        Class1 class1 = new Class1();
        class1.start(1);
        //enter code here

    }
}

Answer 1

从 Class2 run的方法和从 Class1 start的方法之间有循环引用。

Answer 2

Your run method calls start , which calls run , which calls start , which calls...

my purpose : Main >create class1>go to class1 and send int to class2>do sth and return result as int to class1 again and print the result.

If this is your purpose just make a method to do what you want and then return the result:

public int foo(int b) {
    return b+10+a;
}

So that your start method will call foo() and do the necessary calculations and then return the results instead of calling the method again. However Java is pass by value, so you will have to resolve the results of foo() to your variable. However you can simply just print the results:

public void start (int c)
{        
    System.out.println("Number :"+ class2.foo(b));
}