Java 2D更改用户输入的值

huangapple
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英文:

Java 2d changing values for user input

问题

这段代码生成一个3行5列的二维数组。我需要获取用户输入并将所有小于用户输入值的生成值替换为100。运行这段代码可以完成我需要的所有操作，但我无法弄清楚如何获取用户输入，将其与随机值进行比较，并确定是否小于以将其更改为100。

  1. import java.util.*;
  3. public class secondArray {
  4.    
  5.    public static void main(String[] args) {
  6.      
  7.        int[][] array2 = new int[3][5];
  8.       
  9.        Random rand = new Random();
  10.        Scanner input = new Scanner(System.in);
  11.       
  12.        for(int r = 0; r < array2.length; r++) {
  13.            for( int c = 0; c < array2[r].length; c++) {
  14.                array2[r][c] = rand.nextInt(50-20 +1)+20;
  15.            }
  16.        }
  17.        System.out.println("The first array is: ");
  18.       
  19.        for(int r = 0; r < array2.length; r++) {
  20.            for( int c = 0; c < array2[r].length; c++) {
  21.                System.out.print(array2[r][c] + " ");
  22.            }
  23.            System.out.println();
  24.        }
  25.        System.out.println("\nEnter a number for x: ");
  26.        int x;
  27.        x = input.nextInt();
  28.        System.out.println("\nArray after changing numbers less than "+ x +" :");
  30.        for(int r = 0; r < array2.length; r++) {
  31.            for( int c = 0; c < array2[r].length; c++) {
  32.                if (array2[r][c] < x) {
  33.                    array2[r][c] = 100;
  34.                }
  35.                System.out.print(array2[r][c] + " ");
  36.            }
  37.            System.out.println();
  38.        }
  39.    }
  40. }
英文:

This code generates a 3 X 5 2d array. I need to get the users input and replace all the generated values that are less than the users input to 100. Running this code does everything I need but I can't figure out how to get the users input to compare itself to the random values and determine if it is less to change it to 100.

<br>

  1. import java.util.*;
  2. public class secondArray {
  3. public static void main(String[] args) {
  4. int[][] array2 = new int[3][5];
  5. Random rand = new Random();
  6. Scanner input = new Scanner(System.in);
  7. for(int r = 0; r &lt; array2.length; r++) {
  8. for( int c = 0; c &lt; array2[r].length; c++) {
  9. array2[r][c] = rand.nextInt(50-20 +1)+20;
  10. }
  11. }
  12. System.out.println(&quot;The first array is: &quot;);
  13. for(int r = 0; r &lt; array2.length; r++) {
  14. for( int c = 0; c &lt; array2[r].length; c++) {
  15. System.out.print(array2[r][c] + &quot; &quot;);
  16. }
  17. System.out.println();
  18. }
  19. System.out.println(&quot;\nEnter a number for x: &quot;);
  20. int x;
  21. x = input.nextInt();
  22. System.out.println(&quot;\nArray after changing numbers less than &quot;+ x +&quot; :&quot;);
  23. }
  24. }

答案1

得分: 1

  1. public class secondArray {
  3.     public static void main(String[] args) {
  5.        int[][] array2 = new int[3][5];
  6.        // 在函数顶部获取用户输入
  7.        x = input.nextInt();
  9.        Random rand = new Random();
  10.        Scanner input = new Scanner(System.in);
  12.        for(int r = 0; r < array2.length; r++) {
  13.            for( int c = 0; c < array2[r].length; c++) {
  14.               // 这里比较用户输入和随机数
  15.                int r = rand.nextInt(50-20 +1)+20;
  16.                if(r >= x)
  17.                   array2[r][c] = r;
  18.                else:
  19.                  array2[r][c] = 100;
  20.            }
  21.        }
  22.        System.out.println("第一个数组是: ");
  24.        for(int r = 0; r < array2.length; r++) {
  25.            for( int c = 0; c < array2[r].length; c++) {
  26.                System.out.print(array2[r][c] + " ");
  27.            }
  28.            System.out.println();
  29.        }
  30.        System.out.println("\n输入一个数字作为 x: ");
  31.        int x;
  32.        System.out.println("\n修改后的数组，小于 " + x + " 的数字：");
  33.     }
  34. }
英文: 
  1. public class secondArray {
  2. public static void main(String[] args) {
  3. int[][] array2 = new int[3][5];
  4. //make read user input in top of the function
  5. x = input.nextInt();
  6. Random rand = new Random();
  7. Scanner input = new Scanner(System.in);
  8. for(int r = 0; r &lt; array2.length; r++) {
  9. for( int c = 0; c &lt; array2[r].length; c++) {
  10. //Here where are comparing the input and the random number
  11. int r = rand.nextInt(50-20 +1)+20;
  12. if(r &gt;= x)
  13. array2[r][c] = r;
  14. else:
  15. array2[r][c] = 100;
  16. }
  17. }
  18. System.out.println(&quot;The first array is: &quot;);
  19. for(int r = 0; r &lt; array2.length; r++) {
  20. for( int c = 0; c &lt; array2[r].length; c++) {
  21. System.out.print(array2[r][c] + &quot; &quot;);
  22. }
  23. System.out.println();
  24. }
  25. System.out.println(&quot;\nEnter a number for x: &quot;);
  26. int x;
  27. System.out.println(&quot;\nArray after changing numbers less than &quot;+ x +&quot; :&quot;);
  28. }
  29. }

huangapple
  • 本文由 发表于 2020年9月20日 06:07:27
  • 转载请务必保留本文链接：https://go.coder-hub.com/63973797.html
  • arrays
  • java
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