java 第一周

package day01;

public class One
{
//java生成6位随机数据验证码。

public static void main(String[] args)
{
int randomCode = One.randomCode();
System.out.println(randomCode);
}

public static int randomCode() {
return (int) ((Math.random() * 9 + 1) * 100000);
}

}

package day01;

public class Two
{
//java 选择排序

public static void main(String[] args)
{
int[] arr = { 1, 42, 2, 4, 64, 33, 54, 56, 53, 45 };
System.out.println("排序前");
for (int num : arr) {
System.out.print(num + " ");
}
for (int i= 0; i < arr.length - 1; i++) {
int k = i;
for (int j = k + 1; j < arr.length; j++) {
if (arr[j] < arr[k]) {
k = j;
}
}
if (i != k) {
int temp = arr[i];
arr[i] = arr[k];
arr[k] = temp;
}
}
System.out.println();
System.out.println("排序后：");
for (int num : arr) {
System.out.print(num + " ");
}
}
}