Generate Possion Dis.

step1:Generate a random number between [0,1]

step2:Let u=F(x)=1-[(1/e)x]

step3:Slove x=1/F(u)

step4:Repeat Step1~Step3 by using different u,you can get x1,x2,x3,...,xn

step5:If the first packet was generated at time [0], than the

second packet will be generated at time [0+x1],The third packet will be generated at time [0+x1+x2],

and so on ….



Random-number generation

1.static method random from class Math

-Returns doubles in the range 0.0 <= x < 1.0

2.class Random from package java.util

-Can produce pseudorandom boolean, byte, float, double, int, long and Gaussian values

-Is seeded with the current time of day to generate different sequences of numbers each time the program executes-Generate Possion Dis.

step1:Generate a random number　　　　between [0,1]

step2:Let u=F(x)=1-[(1/e)x]

step3:Slove x=1/F(u)

step4:Repeat Step1~Step3 by using different u,you can get x1,x2,x3,...,xn

step5:If the first packet was generated at time [0], than the

second packet will be generated at time [0+x1],The third packet will be generated at time [0+x1+x2],

and so on ….



Random-number generation

1.static method random from class Math

-Returns doubles in the range 0.0 <= x < 1.0

2.class Random from package java.util

-Can produce pseudorandom boolean, byte, float, double, int, long and Gaussian values

-Is seeded with the current time of day to generate different sequences of numbers each time the program executes