1 package test;
2
3 /*
4 *Math:数学运算
5 * 成员变量
6 * PI E
7 *
8 * 成员方法
9 * public static int abs(int a) 绝对值
10 * public static double ceil(double a) 向上取整
11 * public static double floor(double a) 向下取整
12 * public static int max(int a,int b)
13 * public static int min (int a,int b)
14 * public static double pow(double a,double b) a的b次幂
15 * public static double random(); [0.0-1.0)
16 * public static int round(float) 参数为double 四舍五入
17 * public static double sqrt(double a) 正平方根
18 *
19 * */
20
21 public class Test01 {
22 public static void main(String[] args) {
23 System.out.println(Math.PI);
24 System.out.println(Math.E);
25
26 //abs
27 System.out.println(Math.abs(-10));
28 //ceil
29 System.out.println(Math.ceil(12.34));
30 //floor
31 System.out.println(Math.floor(12.34));
32 //max
33 System.out.println(Math.max(12,33));
34 System.out.println(Math.max(12, Math.max(14, 44))); //方法嵌套调用
35 //pow
36 System.out.println(Math.pow(2,3));
37 //round
38 System.out.println(Math.round(12.63));
39 System.out.println(Math.round(12.11));
40 //sqrt
41 System.out.println(Math.sqrt(4));
42 }
43 }
1 package test;
2
3 /*
4 * 获取任意区间的随机数
5 * */
6
7 public class Test01 {
8 public static void main(String[] args) {
9 for(int i=0;i<100;i++){
10 System.out.println(getRandom(12,15));
11
12 }
13 }
14
15 public static int getRandom(int start,int end){
16 int number=(int)(Math.random()*(end-start+1))+start;
17
18 return number;
19 }
20 }
