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【Java】乱数生成の方法(Random)

Last updated at Posted at 2019-10-29

Javaで簡単に乱数を生成するプログラム例を紹介します。
##整数型(0~の数字)

int r = new java.util.Random().nextInt(※発生させる乱数の上限値);

ソースのはじめにimport java.util.*をしているなら以下のように書くことも可能です。

int r = new Random().nextInt(※発生させる乱数の上限値);

参考:java.util.Random#nextInt(int) の仕様

##小数型(0~1の乱数を生成するパターン)

double r = Math.random();
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