生日問題(Birthday problem). 一個房間中要有多少人, 才會使其中至少有兩人生日(月日)相同的機率大於0.5? 此程式包含算數實驗值和亂數模擬值-birthday problem, in a set of n randomly chosen people, some pair of them will have the same birthday. By the pigeonhole principle, the probability reaches 100　when the number of people reaches 366. However, 99　probability is reached with just 57 people, and 50　probability with 23 people.

This java program simulates birthday problem.