using a variable in constructor in a method outside of constructor

Question

if i have a constructor like so:

    public Constructor (int a, int b){

        int c =  a;
        int d =  b; 
    }

How can i then use variable c and d in a method within the same class as the constructor because trying to use just the variables name in the method doesn't seem to work?

after fixing what I said before, you can pass them as parameters to your methods (from within your constructor) or save the values in instance attributes and use them in the method. — jlordo
– jlordo, Commented Nov 21, 2012 at 19:00
not sure why this was down voted, seems like a valid question to me. — Abdullah Jibaly
– Abdullah Jibaly, Commented Nov 21, 2012 at 19:01

Abdullah Jibaly · Accepted Answer · 2012-11-21 19:02:26Z

13

In fact your code will not compile - int c = int a is not valid.

I assume that you meant: - int c = a;.

How can i then use variable c and d in a method within the same class as the constructor

You can't because you have declared them as local variables whose scope ends when the constructor ends execution.

You should declare them as instance variables.

public class MyClass {
    int c;
    int d;

    public MyClass(int a, int b){

        this.c = a;
        this.d = b; 
    }

    public void print() {
        System.out.println(c + " : " + d);
    }
}

edited Nov 21, 2012 at 19:02

Abdullah Jibaly

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answered Nov 21, 2012 at 18:58

Rohit Jain

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3 Comments

Abdullah Jibaly Over a year ago

Tried to fix a syntax error and got rolled back. Make sure you keep it next time you edit :)

Abdullah Jibaly Over a year ago

Yeah I just removed the 2nd ints (on the right hand side of the assignment in the constructor). It looks good now.

Frederik Witte Over a year ago

What's the difference in that case between using this.c = a and c = a?

y.ahmad · Accepted Answer · 2012-11-21 19:09:26Z

1

You need to declare the variables as class members, outside the constructor. In other words, declare c and d outside of the constructor like so:

int c;
int d;

public Constructor (int a, int b) {

        c = a;
        d = b; 
}

answered Nov 21, 2012 at 19:09

y.ahmad

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