Java Math decrementExact() usage and example

Java Math Mathematical Methods

The Java Math decrementExact() method subtracts from the specified variable1and returns it.

The syntax of the decrementExact() method is:

Math.decrementExact(num)

Note: decrementExact() is a static method. Therefore, we can access this method using the Math class name.

decrementExact() parameter

• num - Subtracting1fromParameter

Note: The data type of the parameter should be int or long.

Returns the value of decrementExact()

• Subtracting from the parameter1Returns the value after

Example1: Java Math.decrementExact()

class Main {
　　public static void main(String[] args) {
　　　　//Create an int variable
　　　　int a =　65;
　　　　//　With int argument decrementExact()t
　　　　System.out.println(Math.decrementExact(a));　　//　64
　　　　//　Create a long variable
　　　　long c =　52336L;
　　　　//　Using LONG parameter decrementExact()
　　　　System.out.println(Math.decrementExact(c));　　//　52335
　　}
}

In the above example, we used the Math.decrementExact() method with int and long variables to subtract from their respective variables1.

Example2: Math.decrementExact() throws an exception

If the result of the subtraction exceeds the data type, the decrementExact() method will throw an exception. That is, the result should be within the range of the specified variable's data type.

class Main {
　　public static void main(String[] args) {
　　　　//Create an int variable
　　　　//Minimum int value
　　　　int a =　-2147483648;
　　　　//Using decrementExact() with int parameter
　　　　//Trigger an exception
　　　　System.out.println(Math.decrementExact(a));
　　}
}

In the above example, the value of a is the minimum value of int. Here, the decrementExact() method subtracts from it1a.

　　　a　-　1　　
=>　-2147483648　-　1
=>　-2147483649　　　　//　out of range of int type

Therefore, the decrementExact() method triggers an integer overflow exception.

Recommended Tutorials

• Math.addExact()

• Math.subtractExact()

• Math.multiplyExact()

• Math.incrementExact()

• Math.negateExact()

• Math.toIntExact()

Java Math Mathematical Methods