Returns the argument decremented by one, throwing an exception if the result overflows an int.
Returns the argument decremented by one, throwing an exception if the result overflows a long
package com.logicbig.example.math;
public class DecrementExactExample {
public static void main(String... args) {
findDecrementExact(130);
findDecrementExact(255);
findDecrementExact(-22);
findDecrementExact(0);
findDecrementExact(Integer.MAX_VALUE);
}
private static void findDecrementExact(int x) {
int result = Math.decrementExact(x);
System.out.printf("Decrement by one value of %s = %d%n", x, result);
}
}
Output
Decrement by one value of 130 = 129
Decrement by one value of 255 = 254
Decrement by one value of -22 = -23
Decrement by one value of 0 = -1
Decrement by one value of 2147483647 = 2147483646
package com.logicbig.example.math;
public class DecrementExactExample2 {
public static void main(String... args) {
long x = Long.MIN_VALUE + 3;
for (int y = 1; y <= 4; y++) {
System.out.printf("%37s - 1 = %s%n", x, x - 1);
try {
x = Math.decrementExact(x);
System.out.printf("Math.decrementExact(%s) = %s%n", x, x);
} catch (Exception e) {
System.out.println("error: " + e);
}
System.out.println("-----------");
}
}
}
Output
-9223372036854775805 - 1 = -9223372036854775806
Math.decrementExact(-9223372036854775806) = -9223372036854775806
-----------
-9223372036854775806 - 1 = -9223372036854775807
Math.decrementExact(-9223372036854775807) = -9223372036854775807
-----------
-9223372036854775807 - 1 = -9223372036854775808
Math.decrementExact(-9223372036854775808) = -9223372036854775808
-----------
-9223372036854775808 - 1 = 9223372036854775807
error: java.lang.ArithmeticException: long overflow
-----------
