Thread: Trying to create an alphabet-only string of any length

package test2problem3;
import java.util.Random;
public class Test2problem3 {
 
    public static void main(String[] args) {
 
 
 Random gen= new Random();
 
 String ranString="";
 int len=gen.nextInt(20)+1;
 int ranCode=0;
 
 int count = 0;
 
 while (count <len)
 {
     ranCode=gen.nextInt(58)+65;
     {
     if (((ranCode>=58)&&(ranCode<=64))||((ranCode>=91)&&(ranCode<=96)))
         System.out.print (ranString);
     else     
         ranString += (char)ranCode;
         count++;
 
         System.out.print(ranString);
     }    
 }
 
 
    }
}

I'm a beginner java student. this is what I got so far, with a knowledge I have.

My Q's:
1. There seems to be a slight pattern on some, is there any way to remove that?
2. Is there any wrong/unnecessary parts to my code?
3. Can I know a more efficient way of solving this type of problem, for a future reference?

Thank you.

The indentation is poor.
There should be some type of comment describing the purpose/use of the code.
There is a set of brackets which can be deleted.

ccCcCycCyMcCyMTcCyMTgcCyMTgecCyMTgeH
wwRwRLwRLAwRLACwRLACwRLACwRLACVwRLACVbwRLACVbawRLA CVbarwRLACVbarSwRLACVbarSOwRLACVbarSOs

YYFYFSYFSCYFSCfYFSCfFYFSCfFeYFSCfFeuYFSCfFeumYFSCf FeumhYFSCfFeumhB
-----compare above to below------
Y YF YFS YFSC YFSCf YFSCfF YFSCfFe YFSCfFeu YFSCfFeum YFSCfFeumh YFSCfFeumhB

See why there is a pattern and why more than 20 characters are printed in each run.