java.lang
Class Math

java.lang.Object
  |
  +--java.lang.Math

public final class Math
extends Object

The class Math contains methods for performing basic numeric operations.

Since:
1.3

Field Summary
static double E
          The double value that is closer than any other to e, the base of the natural logarithms.
static double PI
          The double value that is closer than any other to pi, the ratio of the circumference of a circle to its diameter.
 
Method Summary
static double abs(double a)
          Returns the absolute value of a double value.
static float abs(float a)
          Returns the absolute value of a float value.
static int abs(int a)
          Returns the absolute value of an int value.
static long abs(long a)
          Returns the absolute value of a long value.
static double ceil(double a)
          Returns the smallest (closest to negative infinity) double value that is not less than the argument and is equal to a mathematical integer.
static double cos(double a)
          Returns the trigonometric cosine of an angle.
static double floor(double a)
          Returns the largest (closest to positive infinity) double value that is not greater than the argument and is equal to a mathematical integer.
static double max(double a, double b)
          Returns the greater of two double values.
static float max(float a, float b)
          Returns the greater of two float values.
static int max(int a, int b)
          Returns the greater of two int values.
static long max(long a, long b)
          Returns the greater of two long values.
static double min(double a, double b)
          Returns the smaller of two double values.
static float min(float a, float b)
          Returns the smaller of two float values.
static int min(int a, int b)
          Returns the smaller of two int values.
static long min(long a, long b)
          Returns the smaller of two long values.
static double sin(double a)
          Returns the trigonometric sine of an angle.
static double sqrt(double a)
          Returns the correctly rounded positive square root of a double value.
static double tan(double a)
          Returns the trigonometric tangent of an angle.
static double toDegrees(double angrad)
          Converts an angle measured in radians to the equivalent angle measured in degrees.
static double toRadians(double angdeg)
          Converts an angle measured in degrees to the equivalent angle measured in radians.
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

E

public static final double E
The double value that is closer than any other to e, the base of the natural logarithms.
Since:
CLDC 1.1

PI

public static final double PI
The double value that is closer than any other to pi, the ratio of the circumference of a circle to its diameter.
Since:
CLDC 1.1
Method Detail

abs

public static double abs(double a)
Returns the absolute value of a double value. If the argument is not negative, the argument is returned. If the argument is negative, the negation of the argument is returned. Special cases:
  • If the argument is positive zero or negative zero, the result is positive zero.
  • If the argument is infinite, the result is positive infinity.
  • If the argument is NaN, the result is NaN.
In other words, the result is equal to the value of the expression:

Double.longBitsToDouble((Double.doubleToLongBits(a)<<1)>>>1)
Parameters:
a - a double value.
Returns:
the absolute value of the argument.
Since:
CLDC 1.1

abs

public static float abs(float a)
Returns the absolute value of a float value. If the argument is not negative, the argument is returned. If the argument is negative, the negation of the argument is returned. Special cases:
  • If the argument is positive zero or negative zero, the result is positive zero.
  • If the argument is infinite, the result is positive infinity.
  • If the argument is NaN, the result is NaN.
In other words, the result is equal to the value of the expression:

Float.intBitsToFloat(0x7fffffff & Float.floatToIntBits(a))
Parameters:
a - a float value.
Returns:
the absolute value of the argument.
Since:
CLDC 1.1

abs

public static int abs(int a)
Returns the absolute value of an int value. If the argument is not negative, the argument is returned. If the argument is negative, the negation of the argument is returned.

Note that if the argument is equal to the value of Integer.MIN_VALUE, the most negative representable int value, the result is that same value, which is negative.

Parameters:
a - an int value.
Returns:
the absolute value of the argument.
See Also:
Integer.MIN_VALUE

abs

public static long abs(long a)
Returns the absolute value of a long value. If the argument is not negative, the argument is returned. If the argument is negative, the negation of the argument is returned.

Note that if the argument is equal to the value of Long.MIN_VALUE, the most negative representable long value, the result is that same value, which is negative.

Parameters:
a - a long value.
Returns:
the absolute value of the argument.
See Also:
Long.MIN_VALUE

ceil

public static double ceil(double a)
Returns the smallest (closest to negative infinity) double value that is not less than the argument and is equal to a mathematical integer. Special cases:
  • If the argument value is already equal to a mathematical integer, then the result is the same as the argument.
  • If the argument is NaN or an infinity or positive zero or negative zero, then the result is the same as the argument.
  • If the argument value is less than zero but greater than -1.0, then the result is negative zero.
Note that the value of Math.ceil(x) is exactly the value of -Math.floor(-x).
Parameters:
a - a double value.
Returns:
the smallest (closest to negative infinity) double value that is not less than the argument and is equal to a mathematical integer.
Since:
CLDC 1.1

cos

public static double cos(double a)
Returns the trigonometric cosine of an angle. Special case:
  • If the argument is NaN or an infinity, then the result is NaN.
Parameters:
a - an angle, in radians.
Returns:
the cosine of the argument.
Since:
CLDC 1.1

floor

public static double floor(double a)
Returns the largest (closest to positive infinity) double value that is not greater than the argument and is equal to a mathematical integer. Special cases:
  • If the argument value is already equal to a mathematical integer, then the result is the same as the argument.
  • If the argument is NaN or an infinity or positive zero or negative zero, then the result is the same as the argument.
Parameters:
a - a double value.
Returns:
the largest (closest to positive infinity) double value that is not greater than the argument and is equal to a mathematical integer.
Since:
CLDC 1.1

max

public static double max(double a,
                         double b)
Returns the greater of two double values. That is, the result is the argument closer to positive infinity. If the arguments have the same value, the result is that same value. If either value is NaN, then the result is NaN. Unlike the the numerical comparison operators, this method considers negative zero to be strictly smaller than positive zero. If one argument is positive zero and the other negative zero, the result is positive zero.
Parameters:
a - a double value.
b - a double value.
Returns:
the larger of a and b.
Since:
JDE 4.0.0

max

public static float max(float a,
                        float b)
Returns the greater of two float values. That is, the result is the argument closer to positive infinity. If the arguments have the same value, the result is that same value. If either value is NaN, then the result is NaN. Unlike the the numerical comparison operators, this method considers negative zero to be strictly smaller than positive zero. If one argument is positive zero and the other negative zero, the result is positive zero.
Parameters:
a - a float value.
b - a float value.
Returns:
the larger of a and b.
Since:
JDE 4.0.0

max

public static int max(int a,
                      int b)
Returns the greater of two int values. That is, the result is the argument closer to the value of Integer.MAX_VALUE. If the arguments have the same value, the result is that same value.
Parameters:
a - an int value.
b - an int value.
Returns:
the larger of a and b.
See Also:
Long.MAX_VALUE

max

public static long max(long a,
                       long b)
Returns the greater of two long values. That is, the result is the argument closer to the value of Long.MAX_VALUE. If the arguments have the same value, the result is that same value.
Parameters:
a - a long value.
b - a long value.
Returns:
the larger of a and b.
See Also:
Long.MAX_VALUE

min

public static double min(double a,
                         double b)
Returns the smaller of two double values. That is, the result is the value closer to negative infinity. If the arguments have the same value, the result is that same value. If either value is NaN, then the result is NaN. Unlike the the numerical comparison operators, this method considers negative zero to be strictly smaller than positive zero. If one argument is positive zero and the other is negative zero, the result is negative zero.
Parameters:
a - a double value.
b - a double value.
Returns:
the smaller of a and b.
Since:
CLDC 1.1

min

public static float min(float a,
                        float b)
Returns the smaller of two float values. That is, the result is the value closer to negative infinity. If the arguments have the same value, the result is that same value. If either value is NaN, then the result is NaN. Unlike the the numerical comparison operators, this method considers negative zero to be strictly smaller than positive zero. If one argument is positive zero and the other is negative zero, the result is negative zero.
Parameters:
a - a float value.
b - a float value.
Returns:
the smaller of a and b.
Since:
CLDC 1.1

min

public static int min(int a,
                      int b)
Returns the smaller of two int values. That is, the result the argument closer to the value of Integer.MIN_VALUE. If the arguments have the same value, the result is that same value.
Parameters:
a - an int value.
b - an int value.
Returns:
the smaller of a and b.
See Also:
Long.MIN_VALUE

min

public static long min(long a,
                       long b)
Returns the smaller of two long values. That is, the result is the argument closer to the value of Long.MIN_VALUE. If the arguments have the same value, the result is that same value.
Parameters:
a - a long value.
b - a long value.
Returns:
the smaller of a and b.
See Also:
Long.MIN_VALUE

sin

public static double sin(double a)
Returns the trigonometric sine of an angle. Special cases:
  • If the argument is NaN or an infinity, then the result is NaN.
  • If the argument is positive zero, then the result is positive zero; if the argument is negative zero, then the result is negative zero.
Parameters:
a - an angle, in radians.
Returns:
the sine of the argument.
Since:
CLDC 1.1

sqrt

public static double sqrt(double a)
Returns the correctly rounded positive square root of a double value. Special cases:
  • If the argument is NaN or less than zero, then the result is NaN.
  • If the argument is positive infinity, then the result is positive infinity.
  • If the argument is positive zero or negative zero, then the result is the same as the argument.
Parameters:
a - a double value.
Returns:
the positive square root of a. If the argument is NaN or less than zero, the result is NaN.
Since:
CLDC 1.1

tan

public static double tan(double a)
Returns the trigonometric tangent of an angle. Special cases:
  • If the argument is NaN or an infinity, then the result is NaN.
  • If the argument is positive zero, then the result is positive zero; if the argument is negative zero, then the result is negative zero
Parameters:
a - an angle, in radians.
Returns:
the tangent of the argument.
Since:
CLDC 1.1

toDegrees

public static double toDegrees(double angrad)
Converts an angle measured in radians to the equivalent angle measured in degrees.
Parameters:
angrad - an angle, in radians
Returns:
the measurement of the angle angrad in degrees.
Since:
CLDC 1.1

toRadians

public static double toRadians(double angdeg)
Converts an angle measured in degrees to the equivalent angle measured in radians.
Parameters:
angdeg - an angle, in degrees
Returns:
the measurement of the angle angdeg in radians.
Since:
CLDC 1.1



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