随机产生一组数组 按从大到小排列用JAVA怎么做

可用Math.random()来产生随机数,如
int[] number = new int[12000];
for (int i = 0;i<number.length;i++){
number[i] = (int)(Math.random()*100+1);
}
至于排序,方法太多了,选择排序:
public class SelectionSort{
public staic void sort(int[] a){
for (int i = 0;i<a.length -1;i++){
int index = locateNextMaxNumlber(a,i);
exchange(a,i,index);
}
public static int locateNextMaxNumber(int[] a,int sta){
int staNum = a[sta],staIndex = sta;
for (int i = sta+1;i<a.length,i++){
if(a[i] > staNum){
staIndex = i;
staNum = a[i];
}
return staIndex;
}
public static void exchange(int[] a,int i,int j){
int temp = a[i];
a[i] = a[j];
a[j] = temp;
}
}
然后就可调用selectionSort.sort(number)来排序;

Math。random()产生随机数
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