【发布时间】：2023-04-03 04:25:02
【问题描述】：
我有复杂的任务来手动对二维数组进行不同的排序。 到目前为止，我已经完成了这些任务：
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用户需要输入从 10 到 20 的行大小，
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生成二维数组，其中行大小是用户输入，列大小是从 10-50 随机生成的，
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每个数组都填充了从 100 到 999 的随机生成的数字，
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按降序输出每个数组行，
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输出每个数组行的平均值，
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在屏幕上输出平均值最大的数组，
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到目前为止，我无法解决任务 Nr。 7. 输出按每行平均值排序的二维数组。 试图在循环中实现新的 arrayAverage 以对它不起作用的行进行排序。 数组只需要排序而不创建新数组。
import java.util.Arrays;
import java.util.Random;
import java.util.Scanner;
public class SortArray2D {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Sorting two dimensional arrays!!!");
System.out.print("Enter arrays 1st dimension size 10 - 20: ");
int array1stDsize = sc.nextInt();
int array2ndDsize = new Random().nextInt(40) + 10;
System.out.println();
sc.close();
if (array1stDsize > 20 || array1stDsize < 10) {
System.out.println("The number you entered is too big or too small!!!");
} else {
//initializing array
int[][] array = new int[array1stDsize][array2ndDsize];
for (int i = 0; i < array.length; i = i + 1) {
for (int j = 0; j < array[i].length; j = j + 1) {
int input = new Random().nextInt(900) + 100;
array[i][j] = input;
}
}
System.out.println("Array element output: ");
arrayOutput(array);
// array element sorting from biggest to smallest
for (int k = 0; k < array.length; k++) {
for (int i = 1; i < array[k].length; i++) {
for (int j = i; j > 0; j--) {
if (array[k][j] > array[k][j - 1]) {
int element = array[k][j];
array[k][j] = array[k][j - 1];
array[k][j - 1] = element;
}
}
}
}
System.out.println();
System.out.println("Descending Array element output: ");
arrayOutput(array);
System.out.println();
System.out.println("Average value output by array: ");
float[] arrayAverage = new float[array1stDsize];
float average = 0;
for (int i = 0; i < array.length; i = i + 1) {
for (int j = 0; j < array[i].length; j = j + 1) {
average = average + array[i][j];
}
average = (float) (Math.round((average / array[i].length) * 100.0) / 100.0);
System.out.println(i + ". array average value: " + average);
arrayAverage[i] = average;
}
System.out.println();
System.out.println("New array from average values: ");
System.out.println(Arrays.toString(arrayAverage));
System.out.println();
System.out.println("Most valuest array is: ");
double max = 100;
int row = 0;
for (int i = 0; i < arrayAverage.length; i++) {
if (max < arrayAverage[i]) {
max = arrayAverage[i];
row = i;
}
}
System.out.print("Its founded " + row + ". row and it's value is: ");
for (int j = 0; j < array[row].length; j = j + 1) {
System.out.print(" " + array[row][j]);
}
System.out.println();
System.out.println();
//2D array sorting by average values
}
}
public static int[][] arrayOutput(int[][] array) {
for (int i = 0; i < array.length; i = i + 1) {
for (int j = 0; j < array[i].length; j = j + 1) {
if (j == 0) {
System.out.print("{ " + array[i][j]);
} else {
System.out.print(", " + array[i][j]);
}
}
System.out.print(" }");
System.out.println();
}
return array;
}
}
【问题讨论】：
标签： java arrays multidimensional-array columnsorting