date0411/jar包.java

E:\javademo\date0411>jar -cfv haha.jar packa packb已添加清单正在添加: packa/(输入 = 0) (输出 = 0)(存储了 0%)正在添加: packa/DemoA.class(输入 = 320) (输出 = 243)(压缩了 24%)正在添加: packb/(输入 = 0) (输出 = 0)(存储了 0%)正在添加: packb/DemoB.class(输入 = 421) (输出 = 297)(压缩了 29%)E:\javademo\date0411>jar -tfv haha.jar     0 Sun Apr 12 15:57:54 CST 2015 META-INF/    68 Sun Apr 12 15:57:54 CST 2015 META-INF/MANIFEST.MF     0 Sun Apr 12 10:44:24 CST 2015 packa/   320 Sun Apr 12 11:20:16 CST 2015 packa/DemoA.class     0 Sun Apr 12 10:44:18 CST 2015 packb/   421 Sun Apr 12 11:20:08 CST 2015 packb/DemoB.class就是打压缩包。把几个文件压缩成一个 .jar 的压缩文件 。class  {public static void main(String[] args) {System.out.println("Hello World!");}}