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Java Math decrementExact() Method
Java Math Class
Java Math class provides several methods to perform several operations on math calculations like max(), min(), sin(), cos(), round(), ceil(), floor(), abs() etc.
The java.lang.Math class contains various methods for performing basic numeric operations
Here, in the page we will discuss about the math decrementExact() Method in java.
Java Math decrementExact() Method :
Syntax :
public static int decrementExact(int a) public static long decrementExact(long a)
Example 1 :
public class Main {
public static void main(String[] args) {
// example with int data type
int x = 100; // initialize x to 100
try {
// decrement x by one and assign the result to x
x = Math.decrementExact(x);
} catch (ArithmeticException ex) {
// if an ArithmeticException is thrown, print a message
System.out.println("Overflow occurred (int).");
}
System.out.println(x); // prints 99
// example with long data type
long y = 100L; // initialize y to 100 (note the "L" suffix to specify a long literal)
try {
// decrement y by one and assign the result to y
y = Math.decrementExact(y);
} catch (ArithmeticException ex) {
// if an ArithmeticException is thrown, print a message
System.out.println("Overflow occurred (long).");
}
System.out.println(y); // prints 99
}
}
Output :
99 99
Explanation :
In this example, we first demonstrate how to use decrementExact with an int data type. We initialize the variable x to 100 and then call the decrementExact method on x, which decrements x by one and assigns the result back to x. Since x is within the range of an int data type, the decrementExact method does not throw an exception and the value of x is updated to 99.
We then demonstrate how to use decrementExact with a long data type. We initialize the variable y to 100 and then call the decrementExact method on y, which decrements y by one and assigns the result back to y. Since y is within the range of a long data type, the decrementExact method does not throw an exception and the value of y is updated to 99.
Note that when declaring a long literal, you need to use the L suffix to specify that it is a long rather than an int. This is not necessary for int literals.
Example 2:
public class Main {
public static void main(String[] args) {
int x = Integer.MIN_VALUE; // initialize x to the minimum value for an int
try {
// decrement x by one and assign the result to x
x = Math.decrementExact(x);
} catch (ArithmeticException ex) {
// if an ArithmeticException is thrown, print a message
System.out.println("Overflow occurred.");
}
System.out.println(x); // this line will not be reached
}
}
Output :
Overflow occurred. -2147483648
Explanation :
In this example, we initialize the variable x to the minimum value for an int data type. When we call decrementExact on x, it decrements x by one, but since the result is outside the range of an int, an ArithmeticException is thrown. The exception is caught by the catch block, which prints a message to the console. The line System.out.println(x) will not be reached, since it is after the catch block.
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