the java.text.SimpleDateFormat Import;
Import java.util.Date;
public Test4 class {
public static void main (String [] args) {
/ **
* the Math.sqrt () // calculate the square root
* Math.cbrt () // calculating the cubic root
* Math.pow (a, b) // calculate a power of b
* Math.max (,); // calculate the maximum value
* Math.min (,); // calculate the minimum
* /
the System.out .println (the Math.sqrt (16)); //4.0
System.out.println (Math.cbrt (. 8)); //2.0
System.out.println (Math.pow (3,2-)); //9.0
System.out.println (Math.max (2.3,4.5)); 4.5 of 5 //
System.out.println (Math.min (2.3,4.5)); // 2.3
/ **
* absolute value ABS
* /
System.out.println (the Math.abs (-10.4)); //10.4
System.out.println (the Math.abs (10.1)); //10.1
/ **
* ceil ceiling means, a large value is returned
* /
System.out.println (Math.ceil (-10.1)); //-10.0
System.out.println (Math.ceil (10.7)); //11.0
System.out.println (Math.ceil (-0.7) ); //-0.0
System.out.println (Math.ceil (0.0)); //0.0
System.out.println (Math.ceil (-0.0)); //-0.0
System.out.println (the Math. ceil (-1.7)); //-1.0
/ **
* floor floor mean, is the return of small value
* /
System.out.println (Math.floor (-10.1)); //-11.0
System.out.println (Math.floor (10.7)); //10.0
System.out.println (Math.floor (-0.7)); //-1.0
System.out.println (Math.floor (0.0)); //0.0
System.out.println (Math.floor (-0.0)) ; //-0.0
/ **
* random made equal to or greater than 0.0 less than 1.0 is not equal to the random number
* /
System.out.println (Math.random ()); // number less than 0 is greater than 1 double type of
System .out.println (Math.random () * 2) ; // 0 is greater than double the number of types less than 1
System.out.println (Math.random () * 2 + 1); // is greater than 2, less than 1 double number type
/ **
* RINT rounded, double return value
* .5 time will note that is even embarrassing = abnormal. =
* /
System.out.println (Math.rint (10.1)); //10.0
System.out.println (Math.rint (10.7)); //11.0
System.out.println (Math.rint (11.5)); //12.0
System.out.println(Math.rint(10.5)); //10.0
System.out.println(Math.rint(10.51)); //11.0
System.out.println(Math.rint(-10.5)); //-10.0
System.out.println(Math.rint(-11.5)); //-12.0
System.out.println(Math.rint(-10.51)); //-11.0
System.out.println(Math.rint(-10.6)); //-11.0
System.out.println(Math.rint(-10.2)); //-10.0
/**
* round 四舍五入，float时返回int值，double时返回long值
*/
System.out.println(Math.round(10.1)); //10
System.out.println(Math.round(10.7)); //11
System.out.println(Math.round(10.5)); //11
System.out.println(Math.round(10.51)); //11
System.out.println(Math.round(-10.5)); //-10
System.out.println(Math.round(-10.51)); //-11
System.out.println(Math.round(-10.6)); //-11
System.out.println(Math.round(-10.2)); //-10
}
}