随机数发生器用java长期种子值

Question

超级noob问题（从一个人不理解的东西，按位）：

我在JavaScript中使用下面的伪随机数发生器（我的服务器上）。

Math.seed = function(s) { 
    var m_w = s; 
    var m_z = 987654321; 
    var mask = 0xffffffff; 

    return function() { 
     m_z = (36969 * (m_z & 65535) + (m_z >> 16)) & mask; 
     m_w = (18000 * (m_w & 65535) + (m_w >> 16)) & mask; 

     var result = ((m_z << 16) + m_w) & mask; 
     result /= 4294967296; 

     return result + 0.5; 
    } 
} 

var myRandomFunction = Math.seed(1234); 
var randomNumber = myRandomFunction(); 

现在我想用它在Java（在我的客户端）。这适用于int种子值（例如1234的种子在JS和Java上给出相同的数字），但是我的种子值很长。我该如何改变按位运算符？

public class CodeGenerator { 
    private int m_w; 
    private int mask; 
    private int m_z; 

    public CodeGenerator(int seed) { 
     m_w = seed; 
     m_z = 987654321; 
     mask = 0xffffffff; 
    } 

    public int nextCode() { 
     m_z = (36969 * (m_z & 65535) + (m_z >> 16)) & mask; 
     m_w = (18000 * (m_w & 65535) + (m_w >> 16)) & mask; 
     int result = ((m_z << 16) + m_w) & mask; 
     double result2 = result/4294967296.0; 
     return (int)Math.floor((result2 + 0.5) * 999999); 
    } 
} 

Answer 1

在Java中，您需要将种子屏蔽为unsigned int，然后它会生成与JS版本相同的数字。

新的构造：

public CodeGenerator(long seed) { 
    mask = 0xffffffff; 
    m_w = (int) (seed & mask); 
    m_z = 987654321; 
} 

Answer 2

你试过只声明种子和第一个结果为多久？

public class CodeGenerator { 
    private long m_w; 
    private int mask; 
    private int m_z; 

    public static void main(String... a){ 
     System.out.println(new CodeGenerator(1234).nextCode()); //result = 237455 
     System.out.println(new CodeGenerator(1234567891234L).nextCode()); //result = 246468 
    } 

    public CodeGenerator(long seed) { 
     m_w = seed; 
     m_z = 987654321; 
     mask = 0xffffffff; 
    } 

    public int nextCode() { 
     m_z = (36969 * (m_z & 65535) + (m_z >> 16)) & mask; 
     m_w = (18000 * (m_w & 65535) + (m_w >> 16)) & mask; 
     long result = ((m_z << 16) + m_w) & mask; 
     double result2 = result/4294967296.0; 
     return (int)Math.floor((result2 + 0.5) * 999999); 
    } 
}