tactfulsaint 0 Junior Poster in Training

hi guys i just started using mac most of the features windows have is not in mac like environment path, dont even know how to javac with mac.
How can i upgrade my Mac Version 10.4.11 to 10.5 with my (CD ROM) CD ROM is bad and i cant get it fixed and most of the apps i have been trying to use are requesting for 10.5 or later plus i cant install recent java jdk1.6

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