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:

Code :

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Vector<String> v = new Vector<String>(10, 5);

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

Code :

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

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I am getting the following error;

Code :

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

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

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:

Code :

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Integer i = new Integer(random.nextInt(5000));//without autoboxing for clarity
String stringValue = i.toString();

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

Code java:

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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
    }
}

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

Thanks

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)));