Question

我正在处理当前程序，我需要* print语句在最后一次打印所有内容。但是，它会在输入每个数字后继续打印。我是java的新手，我们将不胜感激。

import java.util.Scanner;

public class barPrint
{
    public static void main(String args[])
    {
        Scanner input = new Scanner(System.in);

        int counter = 0;
        int value = 0;

        // counter loop for 5 inputs
        for (counter = 0; counter < 5; counter++){
            System.out.print("Input an integer between 1 and 30: ");
            value = input.nextInt();

            while(value < 1 || value > 30){
                System.out.print("Input an integer between 1 and 30: ");
                value = input.nextInt();
            }
            // print the asterisks based on value
            for (int i = 0; i < value; i++){
                System.out.print("*");

                }
                System.out.println();
        }
        System.exit (0);
    }
}

当前输出：

Input an integer between 1 and 30: 25
*************************
Input an integer between 1 and 30: 22
**********************
Input an integer between 1 and 30: 1
*
Input an integer between 1 and 30: 12
************
Input an integer between 1 and 30: 10
**********

Process finished with exit code 0.

预期产出：

Input an integer between 1 and 30: 25
Input an integer between 1 and 30: 22
Input an integer between 1 and 30: 1
Input an integer between 1 and 30: 12
Input an integer between 1 and 30: 10


*************************
**********************
*
************
**********

Process finished with exit code 0.

Answer 1

在退出

之前将* print打开到右侧

Answer 2

你需要一个数组存储到你的各种计数，这是一个这样的解决方案 -

public static void main(String[] args) {
  Scanner input = new Scanner(System.in);
  // values holds room for 5 inputs
  int[] values = new int[5];

  for (int counter = 0; counter < values.length; counter++) {
    System.out.print("Input an integer between 1 and 30: ");
    System.out.flush();
    int value = input.nextInt(); // <-- declare value here.

    while (value < 1 || value > 30) {
      System.out.print("Input an integer between 1 and 30: ");
      System.out.flush();
      value = input.nextInt();
    }
    values[counter] = value; // <-- store it in the values array.
  }
  // Use the for each operator to iterate over the value(s)...
  for (int value : values) {
    // print the asterisks based on value
    for (int i = 0; i < value; i++) {
      System.out.print("*");
    }
    System.out.println();
  }
  System.out.flush();
  System.exit(0);
}

另一种方法是将输出存储到StringBuilder，如此 -

public static void main(String[] args) {
  Scanner input = new Scanner(System.in);
  StringBuilder sb = new StringBuilder();
  for (int counter = 0; counter < 5; counter++) {
    System.out.print("Input an integer between 1 and 30: ");
    System.out.flush();
    int value = input.nextInt();

    while (value < 1 || value > 30) {
      System.out.print("Input an integer between 1 and 30: ");
      System.out.flush();
      value = input.nextInt();
    }
    for (int i = 0; i < value; i++) {
      sb.append("*");
    }
    sb.append("\n");
  }
  System.out.println(sb.toString());
  System.out.flush();
  System.exit(0);
}

Answer 3

首先，与上述答案一样，将以下for循环放在另一个循环之外：

for (int i = 0; i < value; i++){
     System.out.print("*");
}

而不是内部，就像你做的那样。

其次，我没有注意到这一点：

System.out.print("Input an integer between 1 and 30: ");
value = input.nextInt();

while(value < 1 || value > 30){
       System.out.print("Input an integer between 1 and 30: ");
       value = input.nextInt();
}

两次输入似乎是多余的。删除前两个语句，改为使用do while：

do{
       System.out.print("Input an integer between 1 and 30: ");
       value = input.nextInt();
}while(value < 1 || value > 30);

我相信你仍然会遇到逻辑错误，但是（我不确定你的程序打算做什么）。您似乎想要打印星号的总数，因此您每次进行输入时都必须将值添加到自身，或者您必须使用字符串构建器将其附加到循环中。

Answer 4

当变量为整数时，无法连续打印所有星星你需要有阵列.. 因为如果你需要在最后打印所有*，你需要跟踪每行中的星数... 如果您使用整数，那么当您输入下一行数时，您将丢失先前的行数......

问题的算法是：

1.declare a array

2.设定要显示的总行数

3.计算每行中星号的总数（并将其存储在数组中）

4.根据此阵列中的计数显示星星。

循环后需要Java print语句

4 个答案: