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.javaから.jar、そして実行まで

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java初心者の僕がjavaファイルからjarファイル作って実行するまで

↓元ファイル

hello.java
public class hello {
    public static void main(String[] args) {
        System.out.println("Hello " + args[0]);
    }
}

javacでクラス作って〜

$ javac hello.java
$ ls
hello.class hello.java

makefile書いて〜

hello.mf
Main-Class: hello

jar作って〜

$ jar cfmv hello.jar hello.mf *.class
マニフェストが追加されました
hello.classを追加中です(入=574)(出=354)(38%収縮されました)

実行!

$ java -jar hello.jar World!
Hello World!

一丁あがり!

ハマったのはmakefile作るとこですかね。

$ jar cvf hello.jar *.class
マニフェストが追加されました
hello.classを追加中です(入=574)(出=354)(38%収縮されました)
$ java -jar hello.jar
hello.jarにメイン・マニフェスト属性がありません

えっ!
みたいな

// Larry Carlton & Tak Matsumoto「TAKE YOUR PICK」を聞きながら作業しました。

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