Java- unable to use StringBuilder correctly with Arrays

Question

So i am trying to make this board of 10 rows and 10 columns. I have to used the StringBuilder method to make it but I am unable to do so. My output is coming out wrong. Here is my code

import java.util.ArrayList;
import java.util.Scanner;
public class bord {
    public static void main(String[] args) {
        StringBuilder s= new StringBuilder();
        for( int r=0;r<10;r++)
        {
            for( int c=0;c<10;c++)
            {
                s.append("-");
                System.out.print(" "+s);
            }
            System.out.println("");
        }   
}
}

And here is what i want:

@Aominè 10 groups of "-" per line.. And it keeps increasing to 20, 30 with each line — the feels, May 13 '17 at 16:58

score 1 · Accepted Answer · answered May 13 '17 at 17:20

This works:

public class Board {
    public static void main(String[] args) {
    StringBuilder s= new StringBuilder();
    for( int r = 0; r < 10; r++) {
        for( int c = 0; c < 10; c++) {
            s.append("- ");
        }
        s.append("\n");
    }
    System.out.print(s);
    }
}

score 1 · Answer 2 · answered May 13 '17 at 17:31

Just a another solution and in case you want to use one loop :

StringBuilder s = new StringBuilder();
for (int r = 0; r < 10; r++) {
    s.append(String.format("%0" + 10 + "d", 0).replace("0", "- "));
    s.append("\n");
}
System.out.println(s.toString());

Output

- - - - - - - - - - 
- - - - - - - - - - 
- - - - - - - - - - 
- - - - - - - - - - 
- - - - - - - - - - 
- - - - - - - - - - 
- - - - - - - - - - 
- - - - - - - - - - 
- - - - - - - - - - 
- - - - - - - - - -

Jan B. · Answer 3 · 2017-05-13T17:52:03.433

0

And don't forget those who try to use the stream API wherever possible.

StringBuilder sb = new StringBuilder();
IntStream.range(0,100).forEach(i -> { sb.append(i%10 == 9 ? "-\n" : "- ");});
System.out.println(sb.toString());

Using for-loops is so 2013 ;-P

edited May 13 '17 at 17:52

answered May 13 '17 at 17:44

Jan B.

6,030
5
32
53

score -2 · Answer 4 · answered May 13 '17 at 16:59

-2

use below code :-

 public static void main(String[] args) {
        for( int r=0;r<10;r++)
        {
            StringBuilder s= new StringBuilder();

            for( int c=0;c<10;c++)
            {
                s.append("-");
            }
            System.out.print(" "+s);

            System.out.println("");
        }   
}

answered May 13 '17 at 16:59

Anshul Sharma

3,432
1
12
17

There is no need to use `System.out.print(" "+s);` and `System.out.println("");` both statement. – Sunil Kanzar May 13 '17 at 17:05

Java- unable to use StringBuilder correctly with Arrays

4 Answers4