PepoLinuxで学習用にjavaをインストールしてみたあとの確認です
Centos5.4でjavaをコンパイルと実行するには
gcc-java
java-1.4.2-gcj-compat
が必要です
[root@~]# yum install gcc-java java-1.4.2-gcj-compat
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* base: www.ftp.ne.jp
* extras: www.ftp.ne.jp
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Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package gcc-java.i386 0:4.1.2-46.el5_4.2 set to be updated
--> Processing Dependency: libgcj = 4.1.2-46.el5_4.2 for package: gcc-java
--> Processing Dependency: libgcj-devel = 4.1.2-46.el5_4.2 for package: gcc-java
--> Processing Dependency: libgcj-tools.so.7rh for package: gcc-java
--> Processing Dependency: libgcj.so.7rh for package: gcc-java
--> Processing Dependency: libgij.so.7rh for package: gcc-java
---> Package java-1.4.2-gcj-compat.i386 0:1.4.2.0-40jpp.115 set to be updated
--> Processing Dependency: gjdoc for package: java-1.4.2-gcj-compat
--> Running transaction check
---> Package gjdoc.i386 0:0.7.7-12.el5 set to be updated
--> Processing Dependency: antlr for package: gjdoc
---> Package libgcj.i386 0:4.1.2-46.el5_4.2 set to be updated
---> Package libgcj-devel.i386 0:4.1.2-46.el5_4.2 set to be updated
--> Running transaction check
---> Package antlr.i386 0:2.7.6-4jpp.2 set to be updated
--> Finished Dependency Resolution
Dependencies Resolved
==========================================================================================
Package Arch Version Repository Size
==========================================================================================
Installing:
gcc-java i386 4.1.2-46.el5_4.2 updates 2.9 M
java-1.4.2-gcj-compat i386 1.4.2.0-40jpp.115 base 29 k
Installing for dependencies:
antlr i386 2.7.6-4jpp.2 base 978 k
gjdoc i386 0.7.7-12.el5 base 793 k
libgcj i386 4.1.2-46.el5_4.2 updates 16 M
libgcj-devel i386 4.1.2-46.el5_4.2 updates 1.4 M
Transaction Summary
==========================================================================================
Install 6 Package(s)
Update 0 Package(s)
Remove 0 Package(s)
Total download size: 22 M
Is this ok [y/N]: y
Downloading Packages:
(1/6): java-1.4.2-gcj-compat-1.4.2.0-40jpp.115.i386.rpm | 29 kB 00:00
(2/6): gjdoc-0.7.7-12.el5.i386.rpm | 793 kB 00:00
(3/6): antlr-2.7.6-4jpp.2.i386.rpm | 978 kB 00:01
(4/6): libgcj-devel-4.1.2-46.el5_4.2.i386.rpm | 1.4 MB 00:01
(5/6): gcc-java-4.1.2-46.el5_4.2.i386.rpm | 2.9 MB 00:02
(6/6): libgcj-4.1.2-46.el5_4.2.i386.rpm | 16 MB 00:15
------------------------------------------------------------------------------------------
javaの環境のインストールが完了する、でお決まりのHello World!
[root@~]# cat hello.java
public class Hello {
public static void main(String[] args) {
System.out.println("Hello World!");
}
}
root@~]# gcj -C hello.java
hello.java:1: error: Public class ‘Hello’ must be defined in a file called ‘Hello.java’.
public class Hello {
^
1 error
おや、errorがでましたがな…
内容からすると、Public class ‘Hello’はHello.javaをファイルで定義する必要がある？
おーと、ファイル名が間違いといわっしゃる
[root@~]# mv hello.java Hello.java
[root@~]# gcj -C Hello.java
[root@~]# ll
-rw-r--r-- 1 root root 400 1月 30 17:26 Hello.class
-rw-r--r-- 1 root root 111 1月 30 17:16 Hello.java
[root@~]# java Hello
Hello World!
おー動いたではないか
ちなみにlinuxでコンパイルされたHello.classをWindowsXPで動くか確かめてみる
WindowsXPでLinuxでコンパイルされたHello.classをコマンドプロンプトで実行させます
C:Documents and SettingsAdministrator>dir
2010/01/30 17:35 400 Hello.class
C:Documents and SettingsAdministrator>java Hello
Hello World!
おー動いたではないか
pepoと