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Thread: Why cant I use toString() with vector?

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    Default Why cant I use toString() with vector?

    I have declared a new vector called v of type String with an initial capacity of 10 and increasing by 5 each tiem using the following:
    Vector<String> v = new Vector<String>(10, 5);

    I am then trying to use the add method to add a randome string as follows:

    v.add(toString(random.nextInt(5000)));

    I am getting the following error;

    error: method toString in class Object cannot be applied to given types;

    Why can't i do this? I would have thought it would just pass a random number as a String!


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    Default Re: Why cant I use toString() with vector?

    See the API for Object - the toString method contains no parameters and returns a String - you are attempting to call a toString(int val) method, which does not exist. Call toString on an object, not passing the object to the method:
    Integer i = new Integer(random.nextInt(5000));//without autoboxing for clarity
    String stringValue = i.toString();

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    Default Re: Why cant I use toString() with vector?

    That is not how toString works. You have to call the method on an object and you do not pass it a parameter.

    class Foo {
        String name;
        String dob;
     
        Foo(String n, String d) {
            name = n;
            dob = d;
        }
     
        public String toString() {
            return name + " was born on " + dob;
        }
     
        public static vodi main(String[] args) {
            Foo f = new Foo ("Bob", "1/4/1950");
            System.out.println(f.toString());
            // or
            System.out.println(f); //toString method is automagically called
        }
    }
    Improving the world one idiot at a time!

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    Default Re: Why cant I use toString() with vector?

    Fantastic, that will be why it wasn't working then!

    Thanks

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    Default Re: Why cant I use toString() with vector?

    Your program has some error i.e

    nextInt() is not a static method.we cant call it directly with class name .
    Try It.
    Random r=new Random();
    Vector<String> v = new Vector<String>(10, 5);
    v.add(Integer.toString(r.nextInt(5000)));

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