打印数组中设定值之间的所有数字

我想知道如何在具有随机数的数组中的设定值之间打印所有数字。 它还应说明有多少用户随机数高于设定值。 以下是它的外观示例：

"How many random numbers between 0 – 999 do you want? 12 These are your numbers 998 168 859 32 533 390 339 243 328 164 536 375 these 8 numbers is between 0 – 499 168 32 390 339 243 328 164 375 these 4 numbers is between 500 – 999 998 859 533 536" 

这是我的代码到目前为止，我已设法让它打印最大的数字。

 public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.print(" How many random numbers between 0 – 999 do you want? "); int varde = in.nextInt(); System.out.println(" "); System.out.println(" this is your numbers:"); int randomArray[]=new int[varde]; for(int i = 0; i<varde; i++) { randomArray [i] = (int) (Math.random () * 999); System.out.println(randomArray[i]); } int largest = randomArray[0]; for(int x=0; xlargest){ largest = randomArray[x]; } } System.out.print("Largest no is: "+largest); } 

Answer 1

你去吧

我做的是添加java.util.Random类而不是Math.random()用于随机数生成。

使用ArrayList ，如果需要更多内存，则分配更多内存，以存储低于或大于499的值。

 public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.print(" How many random numbers between 0 – 999 do you want? "); int varde = in.nextInt(); System.out.println(" "); System.out.println(" this is your numbers:"); Random randomGenerator = new Random(); int randomArray[]=new int[varde]; for(int i = 0; ilargest) largest = randomArray[x]; } System.out.println("Largest no is: "+largest); List numbersGreaterThanHalf = new ArrayList(); List numbersLowerThanHalf = new ArrayList(); for(int x=0; x499) numbersGreaterThanHalf.add(randomArray[x]); else numbersLowerThanHalf.add(randomArray[x]); } System.out.println("these " + numbersLowerThanHalf.length() + "numbers is between 0 – 499"); for(Integer number: numbersLowerThanHalf) { System.out.print(number + " "); } System.out.println("these " + numbersGreaterThanHalf.length() + "numbers is between 500 – 999"); for(Integer number: numbersGreaterThanHalf) { System.out.print(number + " "); } } 

没有新的数组实现提取：

  StringBuilder numbersAboveHalf = new StringBuilder(); StringBuilder numberBelowHalf = new StringBuilder(); int countOfNumbersAboveHalf = 0; int countOfNumbersBelowHalf = 0; for(int x=0; x499){ numbersAboveHalf.append(randomArray[x]).append(" "); ++countOfNumbersAboveHalf; } else{ numbersBelowHalf.append(randomArray[x]).append(" "); ++countOfNumbersBelowHalf; } } System.out.println("these " + countOfNumbersBelowHalf + "numbers is between 0 – 499"); System.out.println(numbersBelowHalf.toString()); System.out.println("these " + countOfNumbersAboveHalf + "numbers is between 500 – 999"); System.out.println(numbersAboveHalf.toString()); 

这样做是迭代数组和：

• 计算500以上的数量以及500以下的数量。
• 用数字构建2个字符串。