How to center a string using String.format?

Question

public class Divers {
  public static void main(String args[]){

     String format = \"|%1$-10s|%2$-10s|%3$-20s|\\n\";
     System.out.format(format, \"FirstName\",         


        

Answer 1

public static String center(String text, int len){
    String out = String.format("%"+len+"s%s%"+len+"s", "",text,"");
    float mid = (out.length()/2);
    float start = mid - (len/2);
    float end = start + len; 
    return out.substring((int)start, (int)end);
}

public static void main(String[] args) throws Exception{
    // Test
    String s = "abcdefghijklmnopqrstuvwxyz";
    for (int i = 1; i < 200;i++){
        for (int j = 1; j < s.length();j++){
            //center(s.substring(0, j),i);
            System.out.println(center(s.substring(0, j),i));
        }
    }
}