爪哇郎。Java 中的 Long.highestOneBit()方法，示例
原文:https://www . geesforgeks . org/Java-lang-long-highestonebit-method-Java-examples/
java . lang . long . higheestonebit()是 Java 中的一个内置方法，它首先将数字转换为二进制，然后从左边查找第一个设置位，然后重置其余位，然后返回值。在简单语言中，如果一个数字的二进制表达式包含最少的一个设置位，它将从右-1 返回 2^(last 设置位位置。如果二进制表达式不包含任何设置位，则返回 0。
语法:
public static long highestOneBit(long num)
Parameters:
num - the number passed
Returns:
long value by only considering highest 1 bit in the argument.
示例:
Input : 9
Output : 8
Explanation: Binary Representation = 1001
It considers highest bit(at 4th from right) and now
reset rest of the bits i.e. 1000
so result = 1000 i.e. 8 or in simple terms, the last set
bit position from right is at position 4, hence 2^3=8
Input : 45
Output : 32
下面的程序说明了 Java . lang . long . higheestonebit()函数:
程序 1:
// Java program that demonstrates the use of
// Long.highestOneBit() function
// include lang package
import java.lang.*;
public class GFG {
public static void main(String[] args)
{
long l = 9;
// returns a long value with at most a
// single one-bit, in the position
// of the highest-order ("rightmost")
// one-bit in the specified long value.
System.out.println("highest one bit = " + Long.highestOneBit(l));
l = 45;
System.out.println("highest one bit = " + Long.highestOneBit(l));
}
}
输出:
highest one bit = 8
highest one bit = 32
注意:负数的最高位在任何情况下都是相同的，因此不管是哪个数字，每个负数的输出都是相同的。
程序 2: 下面的程序演示了传递负数时函数的使用。
// java program that demonstrates the use of
// Long.highestOneBit() function
// negative number
// include lang package
import java.lang.*;
public class GFG {
public static void main(String[] args)
{
long l = -15;
// prints the binary of a negative expression
System.out.println("Binary = " + Long.toBinaryString(l));
// returns a long value with at
// most a single one-bit, in the position
// of the highest-order ("rightmost")
// one-bit in the specified int value.
System.out.println("Highest one bit = " + Long.highestOneBit(l));
}
}
输出:
Binary = 1111111111111111111111111111111111111111111111111111111111110001
Highest one bit = -9223372036854775808
当十进制字符串值作为参数传递时，它会返回一条错误消息。 程序 3: 当一个十进制值在参数中传递时。
// java program that demonstrates the
// Long.highestOneBit() function
// decimal value in argument
// include lang package
import java.lang.*;
public class GFG {
public static void main(String[] args)
{
System.out.println("highest one bit = " + Long.highestOneBit(12.34));
}
}
输出:
prog.java:13: error: incompatible types: possible lossy conversion from double to long
System.out.println("highest one bit = " + Long.highestOneBit(12.34));
程序 3: 当一个字符串值在参数中传递时。
// java program that demonstrates the
// Long.highestOneBit() function
// string value in argument
// include lang package
import java.lang.*;
public class GFG {
public static void main(String[] args)
{
System.out.println("highest one bit = " + Long.highestOneBit("12"));
}
}
输出:
prog.java:13: error: incompatible types: String cannot be converted to long
System.out.println("highest one bit = " + Long.highestOneBit("12"));
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