Math类的使用方法：点击打开链接

程序KY6_4.java

package Myjava;

public class KY6_4 {
	public static void main(String args[]) {
		 System.out.println (Math.abs (-5.8));          
		 System.out.println (Math.ceil (3.2));              
		 System.out.println (Math.floor (3.8));                
		 System.out.println (Math.round (3.8));
		 System.out.println (Math.round (3.2));
		 System.out.println (Math.min (3, 2));
		 System.out.println (Math.max (Math.PI, 4));
		 System.out.println (Math.log (7.0));
		 System.out.println (Math.pow (7,2));
		 System.out.println (Math.exp (0.4));
		 System.out.println ("e is:"+ Math.E);          
		 System.out.println ("π is:"+Math.PI);         
		 System.out.println(Math.random()); 
	}
}

运行结果：

5.8

4.0

3.0

4

3

2

4.0

1.9459101490553132

49.0

1.4918246976412703

e is:2.718281828459045

π is:3.141592653589793

0.5699641253238485