[Solved] Java call a method from object

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You have to pass the child object the parents own instance:

public class Test {
    private ObjectClass object;

    public Test (){
        object = new ObjectClass(this);
    }

    public void testMethod(){
        //does something
    }
}

ObjectClass:

public class ObjectClass {
    Test parentInstance;

    public ObjectClass(Test instance){
        parentInstance = instance;
    }

    public void callMethod(){
        parentInstance.testMethod();
    }
}

solved Java call a method from object