Number and math classes

Java Of Math class

function ： tangent （Math.tan()）、 sine (Math.sin()) 、 cosine (Math.cos())、 angle (Math.PI/n)、Π(Math.PI)、 Arctangent representation

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Java Of Number and Math Class method

1	xxxValue() take Number Object to xxx Value of data type and return .
2	compareTo() take number Object and parameter comparison .
3	equals() Judge number Whether the object is equal to the parameter .
4	valueOf() Return to one Number Object specifies the built-in data type
5	toString() Returns the value as a string .
6	parseInt() Parse string to int type .
7	abs() Returns the absolute value of the parameter .
8	ceil() Return greater than or equal to ( >= ) The smallest integer of a given parameter , The type is double precision floating point .
9	floor() Return less than or equal to （<=） The maximum integer for a given parameter .
10	rint() Returns the integer closest to the parameter . The return type is double.
11	round() It said rounding , Algorithm for Math.floor(x+0.5), Add the original number 0.5 Then round down , therefore ,Math.round(11.5) As the result of the 12,Math.round(-11.5) As the result of the -11.
12	min() Returns the minimum of two parameters .
13	max() Returns the maximum of two parameters .
14	exp() Returns the base of a natural number e The parameter power of .
15	log() Returns the logarithm of the natural base of the parameter .
16	pow() Returns the second power of the first argument .
17	sqrt() Find the arithmetic square root of the parameter .
18	sin() Please specify double Sine of type parameter .
19	cos() Please specify double Cosine value of type parameter .
20	tan() Please specify double Tangent value of type parameter .
21	asin() Please specify double Arcsine value of type parameter .
22	acos() Please specify double The arccosine value of the type parameter .
23	atan() Please specify double Arctangent value of type parameter .
24	atan2() Convert Cartesian coordinates to polar coordinates , And return the angle value of polar coordinates .
25	toDegrees() Convert parameters to angles .
26	toRadians() Convert the Angle to radians .
27	random() Returns a random number .

Math Of floor,round and ceil Method example comparison

Parameters	Math.floor	Math.round	Math.ceil
1.4	1	1	2
1.5	1	2	2
1.6	1	2	2
-1.4	-2	-1	-1
-1.5	-2	-1	-1
-1.6	-2	-2	-1

@copy Novice tutorial

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Math as well as Number Methods of class can be called and run directly , Use the class name . Method name