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就安全性而言,Java已经远远低于VB.NET,更无法与安全性著称的C#相比。成员:
Next(); //猎取 0 .. int.MaxValue 的 int 随机数; 可指定局限
NextBytes(); //猎取 0 .. 255 的随机数并添补字节数组
NextDouble(); //猎取 0 .. 1 的 double 随机数
机关函数:
//不指定随机种子, 则默许有体系时钟天生种子
protected void Button1_Click(object sender, EventArgs e)
{
Random r = new Random();
int n1 = r.Next();
int n2 = r.Next();
TextBox1.Text = string.Concat(n1, "
", n2);
}
//种子值不异时, 其随机序列也不异
protected void Button2_Click(object sender, EventArgs e)
{
Random r1 = new Random(1);
Random r2 = new Random(1);
Random r3 = new Random(2);
byte[] bs1 = new byte[10];
byte[] bs2 = new byte[10];
byte[] bs3 = new byte[10];
r1.NextBytes(bs1);
r2.NextBytes(bs2);
r3.NextBytes(bs3);
string s1 = string.Join(", ", bs1); //70, 208, 134, 130, 64, 151, 228, 163, 149, 207
string s2 = string.Join(", ", bs2); //70, 208, 134, 130, 64, 151, 228, 163, 149, 207
string s3 = string.Join(", ", bs3); //113, 147, 198, 149, 36, 185, 227, 111, 124, 56
TextBox1.Text = string.Concat(s1, "
", s2, "
", s3);
}
实习:
protected void Button1_Click(object sender, EventArgs e)
{
Random r = new Random(0);
int n1 = r.Next(); //1559595546
int n2 = r.Next(10); //8
int n3 = r.Next(1000, 2000); //1768
TextBox1.Text = string.Concat(n1, "
", n2, "
", n3);
}
protected void Button2_Click(object sender, EventArgs e)
{
Random r = new Random(0);
double f;
string str = "";
for (int i = 0; i < 10; i++)
{
f = r.NextDouble();
str += f.ToString("0.00 "); //0.73 0.82 0.77 0.56 0.21 0.56 0.91 0.44 0.98 0.27
}
TextBox1.Text = str;
}
你觉得数据库怎么样? |
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