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  1. /* package whatever; // don't place package name! */
  2.  
  3.  
  4. import java.util.stream.Collectors;
  5. import java.util.stream.IntStream;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone {
  9.  
  10.     public static final int WIDTH = 5;
  11.     public static final int HEIGHT = 10;
  12.  
  13.     public static void main(String[] args) {
  14.         String[][] generateGrid = generateGrid(WIDTH, HEIGHT);
  15.         printGrid(WIDTH,HEIGHT, generateGrid);
  16.     }
  17.  
  18.     public static String[][] generateGrid(int width, int height) {
  19.         String[][] gridData = new String[height][width];
  20.         for (int row = 0; row < height; row++) {
  21.             for (int column = 0; column < width; column++) {
  22.                 gridData[row][column] = " ";
  23.             }
  24.         }
  25.         return gridData;
  26.     }
  27.  
  28.     public static String padRight(String s, int n) {
  29.         return String.format("%-" + n + "s", s);
  30.     }
  31.  
  32.     public static String padLeft(String s, int n) {
  33.         return String.format("%" + n + "s", s);
  34.     }
  35.  
  36.     public static String repeatChar(char c, int n) {
  37.         return IntStream.range(0, n).mapToObj(i -> String.valueOf(c)).collect(Collectors.joining(""));
  38.     }
  39.  
  40.     public static void printGrid(int width, int height, String[][] gridData) {
  41.         System.out.printf("%d x %d Grid%n", width, height);
  42.         int lengthOfMaxRowNum = String.valueOf(height-1).length();
  43.         // TODO: can be calculated as max length over Strings in gridData
  44.         int maxCellWidth = 4;
  45.  
  46.         System.out.print(padRight(" ", lengthOfMaxRowNum));
  47.         for (int column = 0; column < width; column++) {
  48.             System.out.print(padLeft(String.valueOf(column), maxCellWidth + 1));
  49.         }
  50.         System.out.println();
  51.         printHorizontalLine(width, lengthOfMaxRowNum, maxCellWidth);
  52.         System.out.println();
  53.  
  54.         for (int row = 0; row < height; row++) {
  55.             // TODO: alignment of headers (col-numbers) could be customizable
  56.             System.out.print(padLeft(String.valueOf(row), lengthOfMaxRowNum));
  57.             for (int column = 0; column < width; column++) {
  58.                 // TODO: alignment of cell-data could be customizable
  59.                 System.out.print("|" + padLeft(gridData[row][column], maxCellWidth));
  60.             }
  61.             System.out.println("|");
  62.             printHorizontalLine(width, lengthOfMaxRowNum, maxCellWidth);
  63.             System.out.println();
  64.         }
  65.     }
  66.  
  67.     private static void printHorizontalLine(int width, int lengthOfMaxRowNum, int maxCellWidth) {
  68.         String line =  repeatChar('-', maxCellWidth);
  69.         System.out.print(padLeft(" ", lengthOfMaxRowNum));
  70.         for (int column = 0; column < width; column++) {
  71.             System.out.printf("+"+line);
  72.         }
  73.         System.out.printf("+");
  74.     }
  75.  
  76.  
  77. }
Success #stdin #stdout 0.15s 2184192KB
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stdin
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Standard input is empty
stdout
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5 x 10 Grid
     0    1    2    3    4
 +----+----+----+----+----+
0|    |    |    |    |    |
 +----+----+----+----+----+
1|    |    |    |    |    |
 +----+----+----+----+----+
2|    |    |    |    |    |
 +----+----+----+----+----+
3|    |    |    |    |    |
 +----+----+----+----+----+
4|    |    |    |    |    |
 +----+----+----+----+----+
5|    |    |    |    |    |
 +----+----+----+----+----+
6|    |    |    |    |    |
 +----+----+----+----+----+
7|    |    |    |    |    |
 +----+----+----+----+----+
8|    |    |    |    |    |
 +----+----+----+----+----+
9|    |    |    |    |    |
 +----+----+----+----+----+
https://ideone.com/DmJgHw
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
secret

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