Java 番石榴| floorPowerOfTwo()方法 IntMath Class
原文:https://www . geesforgeks . org/Java-guava-floweroftwo-method-int math-class/
番石榴的 IntMath 类的floweroftwo()方法接受一个参数，并返回比参数中传递的值小 2 的最大幂。这相当于:检查流量(2，log2(x，FLOOR)) 。
语法:
public static int floorPowerOfTwo(int x)
参数:该方法接受单个参数 x，x 为整数值。
返回值:该方法返回小于或等于 x 的 2 的最大幂。
异常:方法 floorPowerOfTwo(int x)抛出IllegalArgumentExceptionif x<=0。
例 1 :
// Java code to show implementation
// of floorPowerOfTwo(int x) method
// of Guava's IntMath class
import java.math.RoundingMode;
import com.google.common.math.IntMath;
class GFG {
// Driver code
public static void main(String args[])
{
int n1 = 10;
// Using floorPowerOfTwo(int x) method
// of Guava's IntMath class
int ans1 = IntMath.floorPowerOfTwo(n1);
System.out.println("Largest power of 2 less "
+ "than or equal to " + n1 + " is : " + ans1);
int n2 = 127;
// Using floorPowerOfTwo(int x) method
// of Guava's IntMath class
int ans2 = IntMath.floorPowerOfTwo(n2);
System.out.println("Largest power of 2 less "
+ "than or equal to " + n2 + " is : " + ans2);
}
}
输出:
Largest power of 2 less than or equal to 10 is : 8
Largest power of 2 less than or equal to 127 is : 64
例 2 :
// Java code to show implementation
// of floorPowerOfTwo(int x) method
// of Guava's IntMath class
import java.math.RoundingMode;
import com.google.common.math.IntMath;
class GFG {
static int findFloorPow(int x)
{
try {
// Using floorPowerOfTwo(int x)
// method of Guava's IntMath class
// This should raise "IllegalArgumentException"
// as x <= 0
int ans = IntMath.floorPowerOfTwo(x);
// Return the answer
return ans;
}
catch (Exception e) {
System.out.println(e);
return -1;
}
}
// Driver code
public static void main(String args[])
{
int x = -3;
try {
// Function calling
findFloorPow(x);
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
java.lang.IllegalArgumentException: x (-3) must be > 0
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