隨機數發生器用java長期種子值

Question

超級noob問題（從一個人不理解的東西，按位）：

我在JavaScript中使用下面的僞隨機數發生器（我的服務器上）。

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(); 

現在我想用它在Java（在我的客戶端）。這適用於int種子值（例如1234的種子在JS和Java上給出相同的數字），但是我的種子值很長。我該如何改變按位運算符？

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，您需要將種子屏蔽爲unsigned int，然後它會生成與JS版本相同的數字。

新的構造：

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

Answer 2

你試過只聲明種子和第一個結果爲多久？

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); 
    } 
}