如何在java中创建直方图

可能重复：
如何在java中将数字转换为符号？ 例如，而不是2到**，或3到***等。

如何将数字转换为直方图？ 直方图应根据该值的滚动次数显示2-12的条形图。 目前我的输出就像第二张图片，但假设看起来像第一张图片。 谢谢。

public static void main(String[] args) { // TODO code application logic here System.out.print("Please enter how many times you want to roll two dice?"); Scanner sc = new Scanner(System.in); int n = sc.nextInt(); int [] rolls = new int[n]; Random r1 = new Random(); Random r2 = new Random(); int dice1; int dice2; int two = 0; int three = 0; int four = 0; int five = 0; int six = 0; int seven = 0; int eight = 0; int nine = 0; int ten = 0; int eleven = 0; int twelve = 0; for (int roll=0; roll < rolls.length; roll++) { dice2 = r2.nextInt(6)+1; dice1 = r1.nextInt(6)+1; System.out.println(roll + " The first dice rolled a " + dice1 + " the second dice rolled a " + dice2); int sum; sum = dice1 + dice2; if (sum == 2) two++; if (sum == 3) three++; if (sum == 4) four++; if (sum == 5) five++; if (sum == 6) six++; if (sum == 7) seven++; if (sum == 8) eight++; if (sum == 9) nine++; if (sum == 10) ten++; if (sum == 11) eleven++; if (sum == 12) twelve++; } System.out.println("Histogram of rolls:" ); System.out.println("2 occurred " + two + " times"); System.out.println("3 occurred " + three + " times"); System.out.println("4 occurred " + four + " times"); System.out.println("5 occurred " + five + " times"); System.out.println("6 occurred " + six + " times"); System.out.println("7 occurred " + seven + " times"); System.out.println("8 occurred " + eight + " times"); System.out.println("9 occurred " + nine + " times"); System.out.println("10 occurred " + ten + " times"); System.out.println("11 occurred " + eleven + " times"); System.out.println("12 occurred " + twelve + " times"); } 

}

Answer 1

以下是您可以用来完成此操作的各种代码。

创建数组

 int[] histogram = new int[13]; 

增加数组中的位置

 histogram[id]++; 

打印直方图

 System.out.println("Histogram of rolls:" ); printHistogram(histogram); 

这里有一些辅助函数。

 private void printHistogram(int[] array) { for (int range = 0; range < array.length; range++) { String label = range + " : "; System.out.println(label + convertToStars(array[range])); } } private String convertToStars(int num) { StringBuilder builder = new StringBuilder(); for (int j = 0; j < num; j++) { builder.append('*'); } return builder.toString(); } 

应根据需要修改代码。