CODEWITHSUNDEEP
javavectordata-structurescollections
shanky singh
shanky singh

Reputation: 1141

How to insert vector element inside vector in java

I have a two set of vector and I need to insert second set in each of the first set element and print.

my input is like : {RED,BLUE,GREEN},{CSK,MI,RCB}

my output is like : {RED,CSK},{RED,MI},{RED,RCB},{BLUE,CSK},{BLUE,MI},{BLUE,RCB},{Green,CSK},{Green,MI},{Green,CSK}

I tried my code like this. Can you please suggest the way

public static void main(String[]args){
Vector v = new Vector();
v.addElement("RED");
v.addElement("BLUE");
v.addElement("GREEN"");
Vector v2 = new Vector();
Vector v3 = new Vector();
v2.addElement("CSK");
v2.addElement("RCB");
v2.addElement("MI");
for(int i=0; i<v.size(); i++){
    for(int j=0; j<v2.length; j++){
     v3 = v(i).add(v2(j));
    }
}
for(int i=0; i<v3.size(); i++){
    System.out.println(v3);
}
}

Upvotes: 1

Views: 2613

Answers (3)

bananas
bananas

Reputation: 1196

well I have a solution too..

 public static void main(String[] args) {
            Vector<String> v = new Vector<>();
            v.addElement("RED");
            v.addElement("BLUE");
            v.addElement("GREEN");
            Vector<String> v2 = new Vector<>();
            Vector<String> v3;
            Vector<Vector<String>> v4 = new Vector<>();
            v2.addElement("CSK");
            v2.addElement("RCB");
            v2.addElement("MI");
            for (String vector_v : v) {
                for (String vector_v2 : v2) {
                    v3 = new Vector<>(); // this declares new vector every time and this new vector is
                                        //  added to v4 and thus the list goes
                    v3.add(vector_v2);
                    v3.add(vector_v);
                    v4.add(v3);
                }
            }
            System.out.println(v4);
        }

Upvotes: 3

Joop Eggen
Joop Eggen

Reputation: 109547

This is called a cartesian product and works as follows:

List<String> rgbs = Arrays.asList("RED", "GREEN", "BLUE");
List<String> modes = Arrays.asList("CSK", "MI", "RCB");
List<List<String>> cartesianProduct = new ArrayList<>();
for (String rgb : rgbs) {
    for (String mode : modes) {
        List<String> product = new ArrayList<>();
        product.add(rgb);
        product.add(mode);
        cartesianProduct.add(product);
    }
}

I did use a bit of new syntax and classes probably still unknown to you, but quite similar to your code.

The important point is that every element of the result is itself a combination of two strings. Here I used a List.

Upvotes: 3

PrabaharanKathiresan
PrabaharanKathiresan

Reputation: 1129

your expected output can be achived in below way.

public static void main(String[]args){
        Vector v = new Vector();
        v.addElement("RED");
        v.addElement("BLUE");
        v.addElement("GREEN");
        Vector v2 = new Vector();
        Vector v3 = null;
        v2.addElement("CSK");
        v2.addElement("RCB");
        v2.addElement("MI");
        for(int i=0; i<v.size(); i++){
            for(int j=0; j<v2.size(); j++){
                v3 = new Vector();
                v3.add(v.get(i));
                v3.add(v2.get(j));
                System.out.println(v3);
            }
        }
//      for(int i=0; i<v3.size(); i++){
//          System.out.println(v3);
//      }

from above

  1. v3 = v(i).add(v2(j)); This line will not compile
  2. no length in vector only size
  3. to get the element have to use get(index) method
  4. avoid using vector better go with ArrayList

Upvotes: 2

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