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JavaでFizzBuzzする環境を整える。

Last updated at Posted at 2014-03-07
  • javaは既に入ってた。
  • maven入れる。
brew install maven
  • プロジェクト作る
mvn archetype:generate

archetypeはプロジェクトの形式。
今回はとりあえず動かせればいいので maven-archetype-quickstart

groupIdはプロジェクトの識別子。公開しないならなんでもいい。
artifactIdはプロジェクトの名前。ディレクトリ名になる。

こんなかんじのディレクトリ構成になった。
[masato@mba] $ tree
.
├── pom.xml
└── src
    ├── main
    │   └── java
    │       └── test
    │           └── App.java
    └── test
        └── java
            └── test
                └── AppTest.java

7 directories, 3 files
  • FizzBuzzを書く
src/main/java/test/FizzBuzz.java
package test;

public class FizzBuzz {
	public static void main(String[] args) {
		String val = null;
		for(int i=1; i<100; i++) {
			if (i%15 == 0) {
				val = "FizzBuzz";
			} else if (i%3 == 0) {
				val = "Fizz";
			} else if (i%5 == 0) {
				val = "Buzz";
			} else {
				val = String.valueOf(i);
			}

			System.out.print(val);
			System.out.print(" ");

		}
	}
}
  • コンパイルして実行
 mvn compile
 java -classpath target/classes test.FizzBuzz
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