CODEWITHSUNDEEP
javavector
Amanjeet Singh Randhawa
Amanjeet Singh Randhawa

Reputation: 11

program to implement vector in java

I am a beginner in Java and I have to implement vector in java by using these methods addElement(), elementAt(), removeElement(), size() and I don't know how I tried to write the code of addElement first and I am getting this error :

enter image description here

Please I really need help with this

Here is the code :

import java.util.Vector;

class Vectimplement {
    public static void main(String[] args) {
        Vector v = new Vector();
        v.add("element_1");
        v.add("element_2");
        v.add("element_3");
        v.addElement("New Element");
        System.out.println("Elements in Vector :");

        for(int i=0; i < v.size(); i++){
            System.out.println(v.get(i));
        }
    }
}

Upvotes: 0

Views: 3718

Answers (5)

Priyanka Tayade
Priyanka Tayade

Reputation: 11

You can add values by accepting it from user:
public class Vectorexapp {
     public static void main(String[] args) {
         Scanner sc=new Scanner(System.in);
         int a,b;
         String s;
         double c;
         System.out.println("Enter 2 integer values, 1 string and 1 float value:");
         a=sc.nextInt();
         b=sc.nextInt();
         s=sc.next();
         c=sc.nextDouble();

        Vector v=new Vector();
        v.add(0,a);
        v.add(1,b);
        v.add(2,s);
        v.add(3,c);
        System.out.println("vector values:"+v);
         System.out.println("vector size:"+v.size());
         System.out.println("Vector capacity:"+v.capacity());

    }

}

output:
Enter 2 integer values, 1 string and 1 float value:
60
40
abcd
50.6
vector values:[60, 40, abcd, 50.6]
vector size:4
Vector capacity:10

Upvotes: 0

Priyanka Tayade
Priyanka Tayade

Reputation: 11

Vector to add element at specified position:

public class Vectorexapp {
     public static void main(String[] args) {
        Vector v=new Vector();
        v.add(0,10);
        v.add(1,20);
        v.add(2,"HELLO");
        v.add(3,40.5);

        System.out.println("Value at index 2:" +v.get(1));
        System.out.println("Values of vector:"+v);
        v.clear();
         System.out.println("After clear vector values:"+v);
    }

}

output:
Value at index 2:20
Values of vector:[10, 20, HELLO, 40.5]
After clear vector values:[]

Upvotes: 0

Priyanka Tayade
Priyanka Tayade

Reputation: 11

Vector is a pre define class you can use it's method my creating it's object as follow,

To add values in vector use object.add() methods,

following are some methos:

public class Vectorexapp {
     public static void main(String[] args) {
        Vector v=new Vector();
        v.add(10);
        v.add(20);
        v.add("HELLO");
        v.add(40.5);

        System.out.println("first element:"+v.firstElement());

        System.out.println("last element:"+v.lastElement());

        System.out.println("Values of vector:"+v);
    }

}

Upvotes: 0

KNU
KNU

Reputation: 2515

After supressing warnings I was able to run program successfully :

package test;

import java.util.Vector;

class Vectimplement {

@SuppressWarnings("unchecked")
public static void main(String[] args) {
    @SuppressWarnings("rawtypes")
    Vector v = new Vector();
    v.add("element_1");
    v.add("element_2");
    v.add("element_3");
    v.addElement("New Element");
    System.out.println("Elements in Vector :");
    for (int i = 0; i < v.size(); i++) {
        System.out.println(v.get(i));
    }
}
}

Console Output : 

element_1
element_2
element_3
New Element

These warnings are generated because after Java6(or maybe 7) it was required to explicitly provide the "type" of Objects to be stored in containers. Hence, the best practice is to use :

Vector<String> v = new Vector<>();

Upvotes: 1

Ilya I
Ilya I

Reputation: 1282

Use generics to specify the type of objects you're going to put into the collection.

Vector<String> v = new Vector<>();

Upvotes: 3

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