Java中的Integer reverseBytes（）方法-yiteyi-C++库

爪哇。整型。reverseBytes（int a）是一个内置方法，它返回通过反转字节在指定int值的两个补码表示中。

null

语法：

public static int reverseBytes(int a)

参数： 该方法采用一个参数 A. 整数类型，其字节将被反转。

返回值： 该方法将返回通过在指定的int值中反转字节而获得的值。

例如：

Input: 75
Output: 1258291200
Explanation:
Consider an integer a = 75 
Binary Representation = 1001011
Number of one bit = 4 
After reversing the bytes we get = 1258291200

Input: -43
Output: -704643073

下面的程序演示了java。整型。reverseBytes（）方法： 项目1： 对于一个正数。

                     // Java program to illustrate the                   
                     // Java.lang.Integer.reverseBytes() method                   
                     import                               java.lang.*;                   
                             
                     public                               class                               Geeks {                   
                             
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                             
                                         int                               a =                               61                               ;                   
                                         System.out.println(                               " Integral Number = "                               + a);                   
                             
                                         // It will return the value obtained by reversing the bytes in the                   
                                         // specified int value                   
                                         System.out.println(                               "After reversing the bytes we get = "                               +                   
                                         Integer.reverseBytes(a));                   
                                         }                   
                     }                   

输出：

Integral Number = 61
After reversing the bytes we get = 1023410176

项目2： 对于负数。

                     // Java program to illustrate the                   
                     // Java.lang.Integer.reverseBytes() method                   
                     import                               java.lang.*;                   
                             
                     public                               class                               Geeks {                   
                             
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                             
                                         int                               a = -                               43                               ;                   
                                         System.out.println(                               " Integral Number = "                               + a);                   
                             
                                         // It will return the value obtained by reversing the bytes in the                   
                                         // specified int value                   
                                         System.out.println(                               "After reversing the bytes we get = "                               +                   
                                         Integer.reverseBytes(a));                   
                                         }                   
                     }                   

输出：

Integral Number = -43
After reversing the bytes we get = -704643073

方案3： 对于十进制值和字符串。注：当十进制值和字符串作为参数传递时，它返回错误消息。

                     // Java program to illustrate the                   
                     // Java.lang.Integer.reverseBytes() method                   
                     import                               java.lang.*;                   
                             
                     public                               class                               Geeks {                   
                             
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                             
                                         int                               a =                               37.81                               ;                   
                                         System.out.println(                               " Integral Number = "                               + a);                   
                                         // It will return the value obtained by reversing the bytes in the                   
                                         // specified int value                   
                                         System.out.println(                               "After reversing the bytes we get = "                               +                   
                                         Integer.reverseBytes(a));                   
                             
                                         a =                               "81"                               ;                               // compile time error will be generated                   
                                         System.out.println(                               " Integral Number = "                               + a);                   
                                         System.out.println(                               "After reversing the bytes we get = "                               +                   
                                         Integer.reverseBytes(a));                   
                                         }                   
                     }                   

输出：

prog.java:9: error: incompatible types: possible lossy conversion from double to int
    int a = 37.81;
            ^
prog.java:18: error: incompatible types: String cannot be converted to int
    a = "81";
        ^
2 errors

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