Common methods of Math function in Java are here

Some methods commonly used in Math functions

• Class Mathcontains methods for performing basic number operations

Arithmetic operations

1. Math.abs(a): Take the absolute value of a
2. Math.sqrt(a): Take the square root of a
3. Math.cbrt(a): Take the cube root of a
4. Math.max(a,b): Take the maximum value between a and b
5. Math.min(a,b): Take the minimum value between a and b
6. Math.pow(a,b): Take b square of a

Math.abs(a): Take the absolute value

• method	describe
  abs(double a)	Returns doublethe absolute value of the value.

       /*
        Math.abs() 取绝对值
        */
		System.out.println(7);//7
        System.out.println(-7);//-7
        System.out.println(Math.abs(10.3));//10.3
        System.out.println(Math.abs(-10.3));//10.3

Math.sqrt(a): Take the square root

• method	describe
  sqrt(double a)	Returns doublethe correctly rounded positive square root of the value.

        /*
        Math.sqrt();开平方根
         */
        System.out.println(Math.sqrt(9));//3.0
        System.out.println(Math.sqrt(16));//4.0
        System.out.println(Math.sqrt(-16));//NaN

注：The argument for the square root cannot be negative.

Math.cbrt(a): Take the cube root

• method	describe
  cbrt(double a)	Returns doublethe cube root of the value.

		/*
        Math.cbrt();开立方根
         */
        System.out.println(Math.cbrt(8));//2.0
        System.out.println(Math.cbrt(27));//3.0
        System.out.println(Math.cbrt(-27));//-3.0

Math.max(a,b): take the maximum value

• method	describe
  max(double a, double b)	Returns doublethe larger of the two values double.

        System.out.println(Math.max(2,3));//3
        System.out.println(Math.max(5.3,4.6));//5.3
        System.out.println(Math.max(-2.7,4));//4.0

Math.min(a,b): Take the minimum value

• method	describe
  min(double a, double b)	Returns doublethe smaller of the two values double.

        /*
        Math.min();取最小值
         */
        System.out.println(Math.min(-1.8,6));//-1.8
        System.out.println(Math.min(0.7,10));//0.7
        System.out.println(Math.min(19,6));//6

Math.pow(a,b): Calculate b square of a

• method	describe
  pow(double a, double b)	Returns the value of the first argument raised to the power of the second argument.

        /*
        Math.pow()
         */
        System.out.println(Math.pow(2,0));//1.0
        System.out.println(Math.pow(3,1));//3.0
        System.out.println(Math.pow(2,2));//4.0

arithmetic carry

1. Math.ceil()：Fengyu Jinyi
2. Math.floor()：Every time there is room for one
3. Math.rint():rounding
4. Math.round():rounding

Math.ceil(a): Take the smallest integer greater than or equal to a

• method	describe
  ceil(double a)	Returns the smallest value that is greater than or equal to the argument and equal to an integer double.

		/*
        Math.ceil()
         */
		System.out.println(Math.ceil(10.2));//11.0
        System.out.println(Math.ceil(9.8));//10.0
        System.out.println(Math.ceil(-10.2));//-10.0

Math.floor(a): Take the largest integer less than or equal to a

• method	describe
  floor(double a)	Returns the largest value less than or equal to the argument and equal to an integer double.

        /*
        Math.floor()
         */
        System.out.println(Math.floor(1.3));//1.0
        System.out.println(Math.floor(0.8));//0.0
        System.out.println(Math.floor(10.5));//10.0
        System.out.println(Math.floor(-100.9));//-101.0

Math.rint(): Round, return double value

• method	describe
  rint(double a)	Returns doublethe closest value to doublea value that is equal to a mathematical integer.

System.out.println(Math.rint(10.1));//10.0
        System.out.println(Math.rint(10.5));//10.0
        System.out.println(Math.rint(10.8));//11.0
        System.out.println(Math.rint(0.2));//0.0
        System.out.println(Math.rint(0.5));//0.0
        System.out.println(Math.rint(0.8));//1.0
        System.out.println(Math.rint(-0.2));//-0.0
        System.out.println(Math.rint(-0.5));//-0.0
        System.out.println(Math.rint(-0.8));//-1.0
        System.out.println(Math.rint(-10.2));//-10.0
        System.out.println(Math.rint(-10.8));//-11.0
        System.out.println(Math.rint(-10.5));//-10.0

注: Take an even number when 0.5

Math.round(): Rounding, long value is returned when double, int value is returned when float

• method	describe
  round(double a)	Returns the closest argument to the argument long, rounding the relationship to positive infinity.
  round(float a)	Returns the closest argument to the argument int, rounding the relationship to positive infinity.

        System.out.println(Math.round(10.1));//10
        System.out.println(Math.round(10.5));//11
        System.out.println(Math.round(10.53));//11
        System.out.println(Math.round(10.8));//11
        System.out.println(Math.round(-10.1));//-10
        System.out.println(Math.round(-10.5));//-10
        System.out.println(Math.round(-10.53));//-11
        System.out.println(Math.round(-10.9));//-11

注: Rounding, int value is returned when float is used, long value is returned when double is used.

random number

Math.random() random number, randomly taking a value within the range [0.0,1.0)

• method	describe
  random()	Returns a value with a positive sign double, greater than or equal to and 0.0less than 1.0.

        System.out.println(Math.random());//[0.0,1.0)
        System.out.println(Math.random()+1);//[1.0,2.0)
        System.out.println(Math.random()*10);//[0.0,10.0)
        System.out.println(Math.random()*10+1);//[1.0,11.0)
        System.out.println(Math.random()*100+0.5);//[0.5,100.5)

注: The return type is double type.

Trigonometric functions

1. Math.sin(): sine
2. Math.cos(): cosine
3. Math.ten():tangent

sin(): sine

public static double sin​(double a)

Returns the trigonometric sine of the angle. Special case:

• If the argument is NaN or infinity, the result is NaN.
• If the argument is zero, the result is zero with the same sign as the argument.

parameter:

• a - Angle, expressed in radians.

(The number of radians in one circle is 2πr/r=2π, and 360° angle = 2π radians. Therefore, 1 radian is approximately 57.3°, which is 57°17'44.806'', and 1° is π/180 radians)

double PI = Math.PI;//double值比任何其他 pi更接近，圆的圆周与其直径的比率。
System.out.println(Math.sin(0));//0.0
System.out.println(Math.sin(6.28));//-0.0031853017931379904
System.out.println(Math.sin(9.42));//0.0047779425901285115
System.out.println(Math.sin(1.57));//0.9999996829318346
System.out.println(Math.sin(3.14));//0.0015926529164868282

注: The input is expressed in radians, and the returned value is within the range [-1,1].

cos(): cosine

public static double cos​(double a)

Returns the trigonometric cosine of the angle. Special case:

• If the argument is NaN or infinity, the result is NaN.
• The result must be semi-monotone

。

parameter

• a - Angle, expressed in radians.

System.out.println(Math.cos(0));//1.0
System.out.println(Math.cos(1.57));//7.963267107332633E-4
System.out.println(Math.cos(3.14));//-0.9999987317275395
System.out.println(Math.cos(4.71));//-0.0023889781122815386
System.out.println(Math.cos(6.28));//-0.9999987317275395

注: The input is expressed in radians, and the returned value is within the range [-1,1].

ten(): tangent

public static double tan​(double a)

Returns the trigonometric tangent of the angle. Special case:

• If the argument is NaN or infinity, the result is NaN.
• If the argument is zero, the result is zero with the same sign as the argument.

The calculated result must be within 1 ulp of the exact result. The result must be semi-monotonic.

parameter

• a - Angle, expressed in radians.

System.out.println(Math.tan(0));//0.0
System.out.println(Math.tan(1.57));//1255.7655915007897
System.out.println(Math.tan(3.14));//-0.001592654936407223
System.out.println(Math.tan(4.71));//418.58782265388515
System.out.println(Math.tan(6.28));//-0.003185317952531891

注: ten90°Does not exist
, that is, the input radian cannot be (π/2±kπ) and the returned value is within the range [-∞,+∞].

Summarize

In the Math function, there are many basic operations on numbers, but basically some of the commonly used methods are listed in detail above. These commonly used methods still need to be used skillfully to avoid encountering problems during the development process or daily tasks. By then, I was at a loss.