java.lang.Long.reverse()是Java中的内置函数，该函数返回通过反转指定long值的二进制补码二进制表示形式中的位顺序而获得的值。

用法:

public static long reverse(long num)

Parameter:

num - the number passed

返回：

the value obtained by reversing the order of the bits in the

two's complement binary representation of the specified long value.

例子：

Input:254

Output:9151314442816847872

Input:8

Output:1152921504606846976

以下示例程序旨在说明java.lang.Long.reverse()函数：

程序1:

// Java program that demonstrates the

// Long.reverse() function

// include lang package

import java.lang.*;

public class GFG {

public static void main(String[] args)

{

long l = 8;

System.out.println("The number after reversing bit= "

+ Long.reverse(l));

l = 254;

System.out.println("The number after reversing bit= "

+ Long.reverse(l));

}

}

输出：

The number after reversing bit= 1152921504606846976

The number after reversing bit= 9151314442816847872

程序2:当传递负数时

// Java program that demonstrates the

// Long.reverse() function

// negative number

// include lang package

import java.lang.*;

public class GFG {

public static void main(String[] args)

{

long l = -8;

System.out.println("The number after reversing bit= "

+ Long.reverse(l));

l = -254;

System.out.println("The number after reversing bit= "

+ Long.reverse(l));

}

}

输出：

The number after reversing bit= 2305843009213693951

The number after reversing bit= 4683743612465315839

程序3:传递十进制数时

// Java program that demonstrates the

// Long.reverse() function

// decimal number

// include lang package

import java.lang.*;

public class GFG {

public static void main(String[] args)

{

System.out.println("The number after reversing bit= "

+ Long.reverse(11.34));

}

}

输出：

prog.java:16:error:incompatible types:possible lossy conversion from double to long

+ Long.reverse(11.34));

程序4:：当传递字符串号时

// Java program that demonstrates the

// Long.reverse() function

// string number

// include lang package

import java.lang.*;

public class GFG {

public static void main(String[] args)

{

System.out.println("The number after reversing bit= "

+ Long.reverse("12"));

}

}

输出：

prog.java:16:error:incompatible types:String cannot be converted to long

+ Long.reverse("12"));