Convert content of vector into word java

Question

I'm trying to return and output the contents of a vector as a cohesive String. I tried vector.toString() but that would also include brackets and commas. I can't have that. Is there a way to convert just the elements of that vector into a String?

Answer 1

• You can do this by using apache StringUtils:

  import java.util.Vector;
  
  import org.apache.commons.lang3.StringUtils;
  
  public class VectorExample {
  
   public static void main(String[] args) {
  
    Vector<String> vector=  new Vector<String>();
    vector.add("test1");
    vector.add("test2");
    vector.add("test3");
  
    System.out.println(StringUtils.join(vector, " "));
   }
  }
  

Output: test1 test2 test3

• I would suggest adding a new method like getElementsAsString() in a utility/helper class or into the class where you have created/processing the vector, which will get you the string in the format you want.

• If you want to stick to and use only the toString() method, extending the Vector is an option. Then you can override the toString() method.

Thanks.

Answer 2

You can do it as follows:

import java.util.Vector;

public class Main {
    public static void main(String args[]) {
        Vector<Integer> vector = new Vector<Integer>();
        vector.add(1);
        vector.add(2);
        vector.add(3);

        StringBuilder sb = new StringBuilder();
        vector.forEach(n -> sb.append(String.valueOf(n)));
        String str = sb.toString();

        System.out.println(sb);
        System.out.println(str);
    }
}

Output:

123
123

---

Alternatively,

import java.util.Vector;

public class Main {
    public static void main(String args[]) {
        Vector<Integer> vector = new Vector<Integer>();
        vector.add(1);
        vector.add(2);
        vector.add(3);

        StringBuilder sb = new StringBuilder();
        for (int n : vector) {
            sb.append(n);
        }
        String str = sb.toString();

        System.out.println(sb);
        System.out.println(str);
    }
}

Output:

123
123

---

Alternatively,

import java.util.Vector;

public class Main {
    public static void main(String args[]) {
        Vector<Integer> vector = new Vector<Integer>();
        vector.add(1);
        vector.add(2);
        vector.add(3);

        String str = "";
        for (int n : vector) {
            str += n;
        }

        System.out.println(str);
    }
}

Output:

123

Note: This approach should be discouraged because it will create as many String objects as the number of iterations.

---

Alternatively,

import java.util.Vector;

public class Main {
    public static void main(String args[]) {
        Vector<Integer> vector = new Vector<Integer>();
        vector.add(1);
        vector.add(2);
        vector.add(3);

        String str = vector.toString().replaceAll(",|\\[|\\]|\\s+", "");

        System.out.println(str);
    }
}

Output:

123

---

If the elements of the Vector are String, you can also do the following:

import java.util.Vector;

public class Main {
    public static void main(String args[]) {
        Vector<String> vector = new Vector<String>();
        vector.add("1");
        vector.add("2");
        vector.add("3");

        String str = String.join("", vector);

        System.out.println(str);
    }
}

Output:

123