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Java 乱数の生成 java.util.Random

Last updated at Posted at 2020-11-28

#1,乱数の生成方法

➊Random random = new Random();

➋int x = random.nextInt(6) + 1; // int型

➌double y = random.nextDouble(); // double型

➍boolean z = random.nextBoolean(); // boolean型

#2,ソースコード

Main.java
import java.util.Random;

public class Main {

	public static void main(String[] args) {

		Random random = new Random();

		int x = random.nextInt(6) + 1;
		double y = random.nextDouble();
		boolean z = random.nextBoolean();

		System.out.println(x);
		System.out.println(y);
		System.out.println(z);

	}

}

#Java チュートリアル:clipboard:
:coffee: Java テキストファイル(.txt .csv)への出力 java.io.FileWriter : :white_check_mark:here
:coffee: Java テキストファイル(.txt .csv)からの入力 java.io.FileReader : :white_check_mark:here
:coffee: Java モニターからの入力 java.util.Scanner : :white_check_mark:here
:coffee: Java GUIからの入力 javax.swing.JOptionPane : :white_check_mark:here
:coffee: Java Mathクラス Math.sqrt : :white_check_mark:here
:coffee: Java 乱数の生成 java.util.Random : :white_check_mark:here
:coffee: Java Stringクラス : :white_check_mark:here
:coffee: Java Wrapperクラス : :white_check_mark:here
:coffee: Java ArrayListクラス java.util.ArrayList : :white_check_mark:here
:coffee: Java メソッド(method)の作り方とオーバーロード : :white_check_mark:here
:coffee: Java printf()メソッド : :white_check_mark:here
:coffee: Java オブジェクト(Object Oriented Programming)とコンストラクタ、スコープ(local,global) : :white_check_mark:here

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