提供jdk的各种版本的下载地址,包括
Download Java SE 8
Download Java SE 7
Download Java SE 6
Download Java SE 5
Download Java SE 1.4
Download Java SE 1.3
Download Java SE 1.2
Download Java SE 1.1
Download JRockit Family
Download Java SE Tutorials
Download JDK 1.3 Documentation
Download JDK 1.4.2 Documentation
Download Java Client Technologies