爪哇郎。Java 中的 Long.reverse()方法，示例
原文:https://www . geesforgeks . org/Java-lang-long-reverse-method-Java-examples/
java . lang . long . reverse()是 Java 中的一个内置函数，它返回通过反转指定长值的二进制补码表示中的位的顺序而获得的值。
语法:
public static long reverse(long num)
Parameter :
num - the number passed
Returns :
the value obtained by reversing the order of the bits in the
two's complement binary representation of the specified long value.
示例:
Input : 254
Output : 9151314442816847872
Input : 8
Output : 1152921504606846976
下面的程序说明了 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 : 当一个负数通过时
// 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 : 当一个十进制数通过时
// 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 :当一个字符串数字被传递时
// 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"));
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