In order to round float and double numbers in Java, we use the java.lang.Math.round() method. The method accepts either double or float values and returns an integer value. It returns the closest integer to number. This is computed by adding ½ to the number and then flooring it.Declaration - The java.lang.Math.round() method is declared as follows −public static int round(float a) public static int round(double a)where a is the value to be rounded.Let us see a program where float and double numbers are rounded in Java.Example Live Demoimport java.lang.Math; public class Example {    public static void main(String[] args) {   ... Read More

In order to get the square root of a number in Java, we use the java.lang.Math.pow() method. The Math.pow(double a) method accepts one argument of the double data type and returns a value which is the square root of the argument.Declaration − The java.lang.Math.sqrt() method is declared as follows −public static double sqrt(double a)where a is the number whose square root is to be found.Let us see a program where we find the square root of number using the Math.sqrt() method.Example Live Demoimport java.lang.Math; public class Example {    public static void main(String[] args) {       // declaring and ... Read More

In order to get the power of a number in Java, we use the java.lang.Math.pow() method. The Math.pow(double a, double b) method accepts two arguments of the double data type and returns a value of the first parameter raised to the power of the second argument.Declaration - The java.lang.Math.pow() method is declared as follows −public static double pow(double a, double b)where a is the base and b is the power to which the base is raised.Let us see a program where we find the power of a number using Math.pow() methodExample Live Demoimport java.lang.Math; public class Example {    public static ... Read More

To obtain the natural log of a number, we use the java.lang.Math.log() method. The Math.log() method returns the natural logarithm i.e. log to the base e of a double value. If the value passed is NaN or negative, the result is NaN. If the value passed is positive infinity, then the value returned is positive infinity. When the parameter is positive zero or negative zero, then negative infinity is returned.Declaration - The java.lang.Math.log() method is declared as followspublic static double log(double a)where a is a value whose natural logarithm is to be found.Let us see a program to get the ... Read More

To obtain the maximum of two numbers using Math.max in Java, we use the java.lang.Math.max() method. The Math.max() accepts two numbers and returns the greater of the two. The result is closer to positive infinity on the number line. Even if one of the values is not a number(NaN), the result is NaN.Declaration - The java.lang.Math.max() method is declared as follows −public static int max(int a, int b) public static double max(double a, double b) public static long max(long a, long b) public static float max(float a, float b)Let us see a program to get the maximum of two numbers ... Read More

To get the floor value of a number, we use the java.lang.Math.floor() method. The Math.floor() method returns the largest (closest to positive infinity) double value which is less than or equal to the parameter and has a value which is equal to a mathematical integer on the number line. If the parameter is NaN or an infinity or positive zero or negative zero, then the result is the same as the argument.Declaration - The java.lang.Math.floor() method is declared as follows −public static double floor(double a)Let us see a program to get the floor value of a number in Java.Example Live Demoimport ... Read More

In order to check if a String has only unicode letters in Java, we use the isDigit() and charAt() methods with decision making statements.The isLetter(int codePoint) method determines whether the specific character (Unicode codePoint) is a letter. It returns a boolean value, either true or false.Declaration − The java.lang.Character.isLetter() method is declared as follows −public static boolean isLetter(int codePoint)where the parameter codePoint represents the character to be checked.The charAt() method returns a character value at a given index. It belongs to the String class in Java. The index must be between 0 to length()-1.Declaration − The java.lang.String.charAt() method is declared ... Read More

To get the exponential value of a number in Java, we use the java.lang.Math.exp() method. The Math.exp() returns a double value which is the Euler’s number e raised to the power of the argument. If the parameter is NaN, the result obtained is NaN. If the argument is positive infinity, then the result is positive infinity. In case the argument is negative infinity, then the output is positive zero.Declaration − The java.lang.Math.exp() method is declared as follows:public static double exp(double a)where a is the number representing the power to which e is raised to.Let us see a program to get ... Read More

In order to get the ceiling value of a number in Java, we use the java.lang.Math.ceil() method. The Math.ceil() method returns the smallest (closest to negative infinity) double value which is greater than or equal to the parameter and has a value which is equal to a mathematical integer on the number line. If the parameter 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 value returned is negative zero.Declaration − The java.lang.Math.ceil() method is ... Read More

The java.lang.Math class has an abs() method which facilitates us to find the absolute values of different data types.Absolute value of floatIn order to compute the absolute value of a float value, we use the java.lang.Math.abs(float a) method. If the argument ‘a’ is negative, the negation of ‘a’ is returned. If the argument ‘a’ is non-negative, the argument itself is returned. When the argument is positive zero or negative zero, the result is positive zero. In case the argument is infinite, the result is positive infinity. If the argument is NaN, the result is NaN.Declaration − The declaration of Math.abs(float ... Read More