ubuntu20下安装jdk1.8

参看https://blog.csdn.net/qq_41798899/article/details/117082359?utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2~aggregatepage~first_rank_ecpm_v1~rank_v31_ecpm-2-117082359-null-null.pc_agg_new_rank&utm_term=ubuntu20.04%E4%B8%8Bjdk1.8%E4%B8%8B%E8%BD%BD&spm=1000.2123.3001.4430