CODEWITHSUNDEEP
javaclassvariablesinteger
THE DOCTOR
THE DOCTOR

Reputation: 4555

Access Integer Value From Another Class

How would I go about accessing data in one java class from another one? For example, I declare an integer with a value in class_one.java and want to make use of that data in class_two.java.

Upvotes: 2

Views: 34402

Answers (7)

Vishal K
Vishal K

Reputation: 13066

You can access a variable of one java class in other java class using either of the following ways:

  1. Declaring the accessing variable as public and accessing it directly in other class. But You should avoid it as it leads to tight coupling.
  2. Declaring the accessing variable as private and accessing it via getter Method . It is the preferred way of accessing variables as it keeps the variable safe from accidentally changing in other class.
  3. Using reflection package .

Upvotes: 0

gaborsch
gaborsch

Reputation: 15758

It depends how your variable is declared. Here is the Oracle tutorial:

http://docs.oracle.com/javase/tutorial/java/javaOO/accesscontrol.html

Upvotes: 0

aclowkay
aclowkay

Reputation: 3887

One one is to build a "get" function which will return the desired value

such as 

public int getA(){
   return a;
}

Another easy solution would be to use static variables. Put the "static" keyword before a variable:

static int a=5;

and to access the variable you use the class: 

Class_One.a;

this would use the variable as if it were inside the same class.

Upvotes: 0

MrSmith42
MrSmith42

Reputation: 10151

a) public :visible for all classes
b) protected : visible in subclasses and classes in the same package
c) default : visible for classes in the same package

This works for variables and method access.

Upvotes: 0

Aakash Anuj
Aakash Anuj

Reputation: 3871

Create an instance of the first class in the other class and simply use its variables, if declared public in the first class.

class Foo
{
   public int a=10; 

}

In the other class, do this

Foo a=new Foo();
int test = a.value;

Upvotes: 0

Mike Clark
Mike Clark

Reputation: 11979

Either declare the variable as public:

public class class_one {
  public Integer myValue;
}

or create a public getter (preferred), such as:

  public class class_one {
    private Integer myValue;

    public Integer getMyValue() {
      return myValue;
    }
  }

Upvotes: 3

Andrew White
Andrew White

Reputation: 53516

Expose your variable via a getter method and call that method on an instance of the desired class.

Upvotes: 1

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