Question

我需要帮助这个程序，我需要

要求用户使用scanner
如果列大小超过4 + 5，则需要重新输入
我需要使用随机对象填充4.0,11.0范围内的所有数组元素
找到上面的数组并调用两个方法，
方法一，我需要找到并打印二维数组中最大的列数
方法二，我需要找到数组中所有元素的平均值并返回平均值。

这是我的代码，它有点完成它，但它也有点混乱，我很困惑。

import java.util.Arrays;
import java.util.Random;
import java.util.Scanner;
public class Test1 {

public static void main(String[] args) {
    // TODO Auto-generated method stub
    Scanner input = new Scanner(System.in);
    System.out.println("Please enter row size");
    int rows = input.nextInt();
    System.out.println("Please enter column size");
    int columns = input.nextInt();
    double n = 4.0;
    if (columns < n+5.0){
    } else{
        System.out.println("The column size is too large, please enter a smaller integer");
    }
    Random rand = new Random();
    int[][] array = new int[rows][columns];
    for(int a = 0; a<rows; a++)
        for(int b = 0; b<columns; b++)
            array[a][b] = rand.nextInt(11-4) + 4;

    for(int i = 0; i<rows; i++){
        double sum = 0;
        int sum2 = 0;
        for(int j = 0; j<columns; j++){
            sum += array[j][i];
            sum2 = sum2 + array[i][j];
             System.out.println(Arrays.deepToString(array));
        }           

        double average = sum/array.length;
        System.out.println("largest sum of the columns is " + sum);
        System.out.println("The average of all elements in the array is " + average);
    }
  }
}

Answer 1

你可以使用while循环来检查输入是否是一个有效的整数，然后如果列数大于4 + 5（我只假设为9）。我使程序流程更加结构化，并使输出整齐。基本上你只需将System.out.println移出Loop就像@Codebender指出的那样。

package array;

import java.util.Random;
import java.util.Scanner;

public class ArrayUtil {

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {

    int columns;
    int rows;

    Scanner input = new Scanner(System.in);

    System.out.println("Please enter row size :");

    while (!input.hasNextInt()) {
        System.out.println("That is not a valid Number! Try again.");
        input.next();
    }

    rows = input.nextInt();

    System.out.println("Please enter column size :");

    while (!input.hasNextInt()) {
        System.out.println("That is not a valid Number! Try again.");
        input.next();
    }

    columns = input.nextInt();

    while (columns > 9) {
        System.out.println("The column size is too large, please enter a smaller integer!");
        columns = input.nextInt();
    }



    Random rand = new Random();

    int[][] array = new int[rows][columns];
    for (int a = 0; a < rows; a++) {
        for (int b = 0; b < columns; b++) {
            array[a][b] = rand.nextInt(11 - 4) + 4;
        }
    }

    for (int[] arr : array) {
        StringBuilder sb = new StringBuilder();

        for (int i : arr) {
            sb.append("[");
            sb.append(i);
            sb.append("]");
        }
        System.out.println("Array :" + sb.toString());
        System.out.println("Average : " + average(arr));
        System.out.println("Max : " + max(arr));
    }

}

public static double average(int[] values) {
    double d = 0;

    for (double value : values) {
        d = value + d;
    }

    return (d / values.length);
}

public static double max(int[] values) {
    double d = 0;
    for (double value : values) {
        if (value > d) {
            d = value;
        }
    }

    return d;
}

}

创建一个填充了Random double并找到Maximum和Average的数组

1 个答案: