Java 中的 StrictMath toIntExact()方法，带示例
原文:https://www . geesforgeks . org/strict math-to textact-method-in-Java-with-examples/
java . lang . strict math . toitexcact()是 Java 中的一个内置方法，用于返回长参数的值。如果结果溢出一个 int 它将抛出一个异常。对象创建不是强制性的，因为 toIntExact(长数字)是静态的。
语法:
public static int toIntExact(long num)
参数:该方法接受一个返回 int 值的长类型的参数数。
返回值:该方法将参数作为 int 返回。
异常:如果参数溢出一个 int 它会抛出算术异常。
例:
Input: num = 2727l
Output: 2727
Input: num = -86262l
Output: -86262
下面的程序说明了 Java . lang . strict math . to textact()方法:
程序 1:
// Java program to demonstrate working
// of java.lang.StrictMath.toIntExact() method
import java.lang.StrictMath;
class Geeks {
// driver code
public static void main(String args[])
{
// Get the long value
// whose IntExact value is needed
long num = 266526l;
// Get the IntExact value
// using toIntExact() method
int intvalue = StrictMath.toIntExact(num);
// Print the IntExact value
System.out.print("IntExact value of "
+ num + " = " + intvalue);
}
}
Output:
IntExact value of 266526 = 266526
程序 2:
// Java program to demonstrate working
// of java.lang.StrictMath.toIntExact() method
import java.lang.StrictMath;
class Geeks {
// driver code
public static void main(String args[])
{
// Get the long value
// whose IntExact value is needed
long num = -7226526l;
// Get the IntExact value
// using toIntExact() method
int intvalue = StrictMath.toIntExact(num);
// Print the IntExact value
System.out.print("IntExact value of "
+ num + " = " + intvalue);
}
}
Output:
IntExact value of -7226526 = -7226526
程序 3: 演示算术异常
// Java program to demonstrate working
// of java.lang.StrictMath.toIntExact() method
import java.lang.StrictMath;
class Geeks {
// driver code
public static void main(String args[])
{
try {
// Get the long value
// whose IntExact value is needed
long num = 654456645546l;
System.out.println("Trying to get "
+ "IntExact value of: "
+ num);
// Get the IntExact value
// using toIntExact() method
int intvalue = StrictMath.toIntExact(num);
// Print the IntExact value
System.out.print("IntExact value of "
+ num + " = " + intvalue);
}
catch (Exception e) {
System.out.println("Exception throwm: " + e);
}
}
}
Output:
Trying to get IntExact value of: 654456645546
Exception throwm: java.lang.ArithmeticException: integer overflow
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