Question

Java编程，随机生成20个大于等于0并且小于100的整数，对这20个整数按降序排序

随机生成20个大于等于0并且小于100的整数，对这20个整数按降序排序，输出排序前和排序后的整数序列。

Answer 1

public static void main(string args[]){
int a[] = new int[20]；
for (int i =0; i<20; i++){
int b = (int)(Math.random()*100);

a[i] = b;

system.out.print(b);

}
a.sort(num);
for(int i=0;i<num.length;i++)
{
System.out.print(num[i]);
}

}

追问

认真点，好吧

追答

这怎么就不认真了。。。

Answer 2

import java.util.Random;
public class Test {
public static final int ARRAY_SIZE = 20;
public static final int RANDOM_MAX_SIZE = 100;

public static void main(String[] args) {
int[] array = new int[ARRAY_SIZE];
Random r = new Random();
for (int i = 0; i < array.length; i++) {
array[i] = r.nextInt(RANDOM_MAX_SIZE);
System.out.print(array[i] + " ");
}
bubbleSort(array);
System.out.println();
for (int i = 0; i < array.length; i++) {
System.out.print(array[i] + " ");
}
}

public static void bubbleSort(int[] array) {
for (int i = 0; i < array.length - 1; i++) {
for (int j = 0; j < array.length - i - 1; j++) {
if (array[j] < array[j + 1]) {
int temp = array[j];
array[j] = array[j + 1];
array[j + 1] = temp;
}
}
}
}
}