math class in java

double roundedDown = Math.round(23.445);
double roundedUp   = Math.round(23.545);
// rounds up and down from float or double

double floor = Math.floor(7.343);  // floor = 7.0
//rounds to the value down to the nearest integer value (returned as double)

double random = Math.random();
// chooses random number between 0 and 1 ( * 100 to make it in 100)

int max = Math.max(10, 20);
//returns largest of two value in parameter