Create a string with n characters

Question

Is there a way in java to create a string with a specified number of a specified character? In my case, I would need to create a string with 10 spaces. My current code is:

Answer 1

You can replace StringBuffer with StringBuilder ( the latter is not synchronized, may be a faster in a single thread app )

And you can create the StringBuilder instance once, instead of creating it each time you need it.

Something like this:

class BuildString {
     private final StringBuilder builder = new StringBuilder();
     public String stringOf( char c , int times ) {

         for( int i = 0 ; i < times ; i++  ) {
             builder.append( c );
         }
         String result = builder.toString();
         builder.delete( 0 , builder.length() -1 );
         return result;
      }

  }

And use it like this:

 BuildString createA = new BuildString();
 String empty = createA.stringOf( ' ', 10 );

If you hold your createA as a instance variable, you may save time creating instances.

This is not thread safe, if you have multi threads, each thread should have its own copy.