parse Vector string into a String?

Question

How can i parse a Vector to a normal String?

i.e

Vector newfollowerlist = "name1, name2, name3, name4";

As soon i output the vector string it looks like this;

[name1, name2, name3, name4]

and i want to delete the [] of the line so i thought about parsing the vector string to a normal String and delete the [] by:

String stringWithoutArraySymbols = String VectorHolder.replaceAll("[",""); 
String stringWithoutArraySymbols = String VectorHolder.replaceAll("]","");

How can i actually parse it or is there an easier way to do this?

Why on earth are you using a Vector?? This type has been deprecated for a number of decades. And what do you mean by "parse into a String"? You can parse a String into a structure or you can format a structure into a String. Please elaborate... — Boris the Spider
– Boris the Spider, Commented Mar 22, 2014 at 23:21
So what should i use else? i just need to store some names and output them without []. — user3220962
– user3220962, Commented Mar 22, 2014 at 23:23
Why not write your own logic to output the contents? Also, although an unlikely situation, your current solution would also edit any entry in the vector which contained a square bracket. — JamesB
– JamesB, Commented Mar 22, 2014 at 23:24
@ james, thats actually no problem since usernames arent able to hold any []. i really just need to delete them and output em :) — user3220962
– user3220962, Commented Mar 22, 2014 at 23:25

Boris the Spider · Accepted Answer · 2014-03-22 23:28:37Z

2

As I mentioned, do not use Vector. Read about the Java collections API.

I will use the Collection interface.

With Java 8:

final String joined = things.stream().collect(Collectors.joining(","));

With Java 7:

final Iterator<String> iter = things.iterator();
final StringBuilder sb = new StringBuilder();
sb.append(iter.next());
while (iter.hasNext()) {
    sb.append(",").append(iter.next());
}
final String joined = sb.toString();

answered Mar 22, 2014 at 23:28

Boris the Spider

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Salix alba · Accepted Answer · 2014-03-22 23:38:03Z

1

A slight variation

String s = newfollowerlist.toString();
System.out.println(s.substring(1, s.length()-1));

You know the format of newfollowerlist.toString() so its easy enough to get your desired format. Should work if newfollowerlist is a Vector, List, Set or many other Collection types.

edited Mar 22, 2014 at 23:38

answered Mar 22, 2014 at 23:30

Salix alba

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2 Comments

Boris the Spider Over a year ago

I would argue that encouraging the OP to use the toString method of Vector to "parse" a Vector is plain absurd. This answer is a dirty hack and the OP will find that in some random Java update this will break. Spectacularly.

Salix alba Over a year ago

The format is defined in the javadoc for AbstractCollection so officially part of the API. docs.oracle.com/javase/1.5.0/docs/api/java/util/… Curiously the javadoc also mentions how its implemented, which is exactly the same algorithm as your solution, apart from a space after the comma.

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