Java 中的整数 highestOneBit()方法
原文:https://www . geeksforgeeks . org/integer-higheestonebit-method-in-Java/
java.lang 的 Integer.highestOneBit()方法返回一个最多只有一个一位的整数值，该整数值位于给定 int 值的最高阶(即最左边)一位的位置。如果指定的值在其二进制补码二进制表示中没有一位，那么它返回零，只要它等于零。 语法:
public static int highestOneBit(*int a*)
参数:该方法取一个整数类型的参数 a ，该参数是指要返回其最高位的值或要对其执行操作的值。 返回:该方法可以返回两种类型的值:
- 返回一个整数值，该整数值位于指定值中最高阶的一位
- 如果指定值等于零，则返回零。
示例:
Input: 19
Output: Highest one bit of the given integer is = 16
Input: -9
Output: Highest one bit of the given integer is = -2147483648
Explanation:
Consider any integer a = 19
Binary Representation = 0001 0011
Highest bit(at 4) i.e.0001 0000
so result = 2^4=16
下面的程序说明了 Java . lang . integer . highestonebit()方法。 程序 1: 为正数。
Java 语言（一种计算机语言，尤用于创建网站）
// Java program to illustrate the
// Java.lang.Integer.highestOneBit() Method
import java.lang.*;
public class HighestOneBit {
public static void main(String[] args)
{
int a = 29;
System.out.println("Number is = " + a);
// returns an int value with at most a single one-bit, in the position
// of the highest-order or the leftmost one-bit in the specified int value
System.out.print("Highest one bit of the given integer is = ");
System.out.println(Integer.highestOneBit(a));
a = 44;
System.out.println("Number is = " + a);
System.out.print("Highest one bit of the given integer is = ");
System.out.println(Integer.highestOneBit(a));
}
}
Output:
Number is = 29
Highest one bit of the given integer is = 16
Number is = 44
Highest one bit of the given integer is = 32
程序 2: 为负数。
Java 语言（一种计算机语言，尤用于创建网站）
// Java program to illustrate the
// Java.lang.Integer.highestOneBit() Method
import java.lang.*;
public class HighestOneBit {
public static void main(String[] args)
{
int a = -9;
System.out.println("Number is = " + a);
// returns an int value with at most a single one-bit, in the position
// of the highest-order or the leftmost one-bit in the specified int value
System.out.print("Highest one bit of the given integer is = ");
System.out.println(Integer.highestOneBit(a));
}
}
Output:
Number is = -9
Highest one bit of the given integer is = -2147483648
程序 3: 为十进制值。 注意:当十进制值因为类型不兼容而作为参数传递时，它会返回一条错误消息。
Java 语言（一种计算机语言，尤用于创建网站）
// Java program to illustrate the
// Java.lang.Integer.highestOneBit() Method
import java.lang.*;
public class HighestOneBit {
public static void main(String[] args)
{
int a = 84.22;
System.out.println("Number is = " + a);
// decimal value 84.22 is passed here
System.out.print("Highest one bit of the given integer is = ");
System.out.println(Integer.highestOneBit(a));
}
}
Output:
prog.java:9: error: incompatible types: possible lossy conversion from double to int
int a = 84.22;
^
1 error
程序 4: 为字符串。 注意:当字符串因为类型不兼容而作为参数传递时，它会返回一条错误消息。
Java 语言（一种计算机语言，尤用于创建网站）
// Java program to illustrate the
// Java.lang.Integer.highestOneBit() Method
import java.lang.*;
public class HighestOneBit {
public static void main(String[] args)
{
int a = "34";
System.out.println("Number is = " + a);
// decimal value 84.22 is passed here
System.out.print("Highest one bit of the given integer is = ");
System.out.println(Integer.highestOneBit(a));
}
}
Output:
prog.java:9: error: incompatible types: String cannot be converted to int
int a = "34";
^
1 error
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