Question

i have a class

    main {  
      Class1 class1=new Class1();  
      class1.function1(); 
    }


     class Class1 {   
        int abc=1;   
        ArrayList<Class2> class2s=new ArrayList<Class2>(); 

        int function1() {
          class2s.add(new Class2(asd));
          abc=555;   
        }    
     }

     class Class2 {   
        int functionx() {
          Log.e("abc?", ""+PARENT???.abc);   
        } 
     }

How can I get the caller Class’s variable, say abc?

Answer 1

You could pass the caller as an argument, like so:

int functionx(Class1 caller) {
  Log.e("abc?", ""+caller.abc)
}

and call it with

Class2 cls = new Class2()
cls.functionx(this)

As long as abc is visible to Class2. Otherwise there is no direct means of knowing your caller in Java. The variable class2s implements a uni-directional relationship between Class1 and Class2. So you can only navigate from Class1 to Class2, not the other way around.