[ubuntu] installation of java

hi everyone

i have problem with java installation ,i m beginner for ubuntu ,i installed it few months ago ,now i java is removed and i want to install it .i tried many times with terminal but all in vain .i can't understand the formation of directories ,so i want to know any other way through i can install java without the formation of directories . i want to know the way i can install java without the use of terminal .

so plz help me if anyone knows about it .