求1到200之间的素数

public class Test5 {
    public static void main(String[] args) {
        int j;
        for(int i= 2;i<=200;i++){
            j=2;
            while (i%j!=0){
                j++;
                if(i==j){
                    System.out.println(i);
                }
            }
        }
    }
}

冒泡排序

public class demo{
    public static void main(String[] args) {
        int[] numbers =new int[]{1,5,8,2,3,9,4};
        int i ,j;
        for(i=0;i<numbers.length;i++){
            for(j=0;j<numbers.length-1-i;j++){
                if(numbers[j]<numbers[j+1]){
                    int tem = numbers[i];
                    numbers[j]=numbers[j+1];
                    numbers[j+1]=temp;
         }
            }
        }
         System.out.println("从大到小排序后的结果是:");
        for(i=0;i<numbers.length;i++)
            System.out.print(numbers[i]+" ");
    }
}