How to get value of getter in class C which was setted in Class A (which was declared in Class B)

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I am having three classes Class A which set Value, class B where both getter and setters are created, Class B which get value (set in Class A)

Because I was creating new instances of Class B in Class A and Class C. I am not able to get value in class Cwhioch was set in Class A.

What I acknowlegeds is We need to pass the reference to Class C instance from class A to Class B.

But I dont know how to do so.

I tried with this code. I know the result it is not possible. I dont know how to do it.

public Class A {
    int X = 9;
    B b = new B();
    b.setValue(X);
}

public Class B {
    private float value = 0;
    public float getValue() {
        return value;
    }
    public void setValue(float value){
        this.value = value;
    }
}

public Class C {
    B b = new B();
    final float x = b.getValue();
}

I expect when I use getValue() method of class B in Class C. I am able to get the value putted in Class A by setValue() method

you may do that by adding public static property inside a Class. Static property are associated to the class directly. they can be called even without creating an instance of the class, ex: ClassName.propertyName.

public Class B {
   public static float value = 0;
}

inside Class A you can set B float value like this :

public Class A {
   B.value = 9;
}

and get the value :

public Class C {
    final float x = B.value;
}

Leveraging Applications of Formal Methods, Verification and , Any model declaration defines a finite set of classes C, the model element classes, i.e. the host language objects which together will make up one instance of the model. which contains all permitted values for a field declared with type t. The OPT types lead to relaxed getter and setter methods permitting the null value,  If you require access to a class member variable’s value from another class, give it a getter like so: public string myValue { get; } And if you should also need to change the data from another class, you can add a setter also: public string myValue { get; set; }

Whenever you create an object using the "new" keyword, remember that you are creating a new object and a new memory space is alloted to it. Now in class C, when you create a new object of B, a new memory space is alloted to this instance b. (This instance b does not point to the same memory location that b in class A points to) Immediately after the object is created, you are calling b.getValue() which will only give you the default value of "value".

when I use getValue() method of class B in Class C. I am able to get the value putted in Class A by setValue() method

In order to get the value set in A, you need to call getValue() of b -- the object b which is in class A (and not the object b which is declared in class C)

So you need to access it using a.b.getValue() in class C.

JavaServer Pages Illuminated, in a different package, so ClassC ClassA ClassB { package P2; import P1.​ClassA; void process() // classA must be declared // public (public class ClassA{. PACKAGE P1 Create a new subfolder called exer188 under C:\JSP\Chapter1 and Write public getter and private setter methods that get/set the values of these  In Java, getter and setter are two conventional methods that are used for retrieving and updating the value of a variable. The following code is an example of a simple class with a private

  1. First of all the instance of class B in Class A and Class C are different.
  2. You don't have any getter in A class to get the Class B field values
  3. You can create a method in Class C and pass by reference of instance in Class A.

Hope this helps you..

5.4. Accessor Methods, Accessor methods, also called get methods or getters, allow a way to get the value of each instance variable from outside of the class. In Unit 2, we also used set/get methods with the Turtle class to get the Turtle object's width, height In App Inventor, you cannot make your own classes, but you can declare UI objects like  In our class above we have a getter and setter for all the properties. We use _ to create a separate value in which to store our name property. Without using this convention, we would get errors every time we called get or set.

You may do that in the following way:

public class A {
    int X;
    B b;
    public A(int x, b b){
        this.b = b;
        this.b.setValue(X);
    }        
}

public class C {
    B b;
    public C(B b){
      this.b = b;
    }
    public float getX(){
       return b.getValue();
    }
}

Now you pass the same reference of B class to both class A and C as shown below:

public static void main(String[] args){
  B b = new B();
  A a = new A(9,b);
  C c = new C(b);

  float x= c.getX();

}

Touch of Class: Learning to Program Well with Objects and Contracts, The indexer has the name , defined with a getter and a setter. If you declare ; class F<G, H> where H: T, new() { . The second one, H, is constrained by T, meaning (as in class C [G, H –> T] in Eiffel) that any actual the declaration read C [G, H–> T create make end] for a creation procedure make of T) that T must provide  You should always create getters and setters. Even if there are no restrictions on what values your fields can take, these helper methods will do no harm. Imagine the following situation: you and your colleagues are writing a program together. You create a Cat class with public fields. All the programmers are using them however they want.

Finally, I am able to solve my question thanks for your suggestions.

But I actually did it. I made my getter and setter static. Now I don't need to create reference again to get value.

My code

public Class A {
    int X = 9;
    B b = new B();
    b.setValue(X);
}

public Class B {
    private static float value = 0;
    public static float getValue() {
        return value;
    }
    public void setValue(float value){
        B.value = value;
    }
}

public Class C {
    final float x = B.getValue();
}

4. Methods Use Instance Variables: How Objects Behave, The Dog class has an instance variable size, that the bark() method uses to decide what If you declare a method to return a value, you must return a value of the declared type! Getters and Setters let you, well, get and set things. faux pas (and we're not talking minor violation like showing up without the 'B' in BYOB)​. Getters and setters are used to protect your data, particularly when creating classes. For each instance variable, a getter method returns its value while a setter method sets or updates its value. Given this, getters and setters are also known as accessors and mutators, respectively. By convention, getters start with the word "get" and setters with the word "set", followed by a variable name

Getters and Setters in Java Explained, For each instance variable, a getter method returns its value while a setter By convention, getters start with the word "get" and setters with the word "set", public class Vehicle { private String color; // Getter public String getColor() { return color; } // Setter public void setColor(String c) { this.color = c; } }. In some way this will boil down to class A setting the value in class B. Class B should have it's own private copy of numLoaves and use a setter to set it. void ClassB::setNumLoaves(const NumLoaves_t& numLoaves) { _numLoaves = numLoaves; } Class A should have a method which will update class B.

Setter and Getter Methods in Java, So what error did we make when declaring our class? These names come from "get" (i.e. "method for getting the value of a field") and "set"  Because its private!!! The private members of a class can only be accessed from within the class. Which means only the member functions of a class can access its private variables.

Reflection, Reflection is a set of language and library features that allows for val c = MyClass::class You can get the reference to a class of a specific object with the same ::class syntax by using where R is the return value type, which is the property type for properties, and the When we have a named function declared like this:. I am a java developer in java you can declare a variable as public static and you can call or refer that variable directly with the class name .for example //this is first class whose variable u are going to use Class First { public static String

Comments
  • you can't because you are setting value in class A.
  • But there must we someway @jackjay
  • yepp. in class C instantiate class A object and access the class B object inside class A.
  • While this code snippet may be the solution, including an explanation really helps to improve the quality of your post. Remember that you are answering the question for readers in the future, and those people might not know the reasons for your code suggestion.