What is the difference between jdk1.4.2 and jdk 1.5.0 and jdk1.6

I have created s front page using jdk1.4.2 swing tools. After that i have updated with jdk.1.60 what happen my window color automatically change

I have used a drop down list box of linked with Mysql database table emp, in this I can't able to type to get a value i have to scroll for picking a emp no. (jdk1.4.2) after updation i can directly type the no i shows i corresponding other details like empname and all

Why it does not work in jdk1.4.2

Question asked by visitor siranjeevi