Java in English · for a complete beginner英文 Java · 写给完全零基础
One small page. One idea.一次只读一页，一次只学一个概念。
I know nothing about Java. I want to learn it in English, not in Chinese. So every page gives one idea, five new words, and three questions I answer out loud.我不懂 Java，而且我想用英文学，不是用中文背。所以每一页只讲一个概念、给五个新词、三道要出声回答的题。
01Three interview questions三道面试题
Three for now, all taken from my own résumé. Each one is a page: a 60-second answer, the mechanism behind it, and the new questions it opens.现在三道，全部从我的简历里挖出来的。一道一页：60 秒答案、背后的机制、以及它又长出了哪些新问题。
A fourth one gets added when the third one is solid.第三道读透了再加第四道。
02The ground: seven lessons地基：七节课
If a word in an answer is missing, the page tells you which lesson to read first. These are the seven pieces.答案里哪个词不认识，页面会告诉你先补哪一节课。就是这七块。
1 数组 · 2 链表 · 3 树 / 红黑树 · 4 key / hash / 冲突 · 5 O(1) / O(n) / O(log n) · 6 HashMap 常用方法 · 7 为什么线程不安全
03How to read a page怎么读一页
- Press 🔊 at the top. Follow the words with your eyes. Twice is enough.点页面顶部的 🔊，眼睛跟着字走。两遍就够。
- Switch to 中英 if a sentence is too hard. Read the English first, then the Chinese.句子太难就切到 中英：先读英文，再看中文。
- Read the 60-second answer, then the mechanism. The new questions are at the bottom of the page.先读 60 秒答案，再读机制。新问题在同一页的底部。
- Answer the three questions at the end out loud, not in your head.最后三道自测要出声回答，不要只在心里想。
Twenty minutes a page. One page a day is enough.一页二十分钟。一天一页就够。
04Why English, and why so slow为什么要英文、为什么这么慢
In an interview the words are English: bucket, collision, resize. If I only know the Chinese word, I hear a sound I cannot follow.面试里蹦出来的是英文词：bucket、collision、resize。如果我只知道中文说法，听到的就是一串抓不住的声音。
So this site is slow on purpose. One question per page, five words, one picture.所以这个网站是故意慢的：一页一道题、五个词、一张图。
→New words新词
Click ▶ hear it for real people on YouGlish; 🔊 for the computer voice.点 ▶ hear it 听真人发音（YouGlish）；点 🔊 听电脑朗读。
✓Check yourself自测
- Say the plan for today in one sentence.用一句话说出今天要做的事。
- Which page are you reading today?今天你读哪一页？
- Say one word you learned, out loud.说出一个今天学的词，出声。
Answer out loud first. Only then open the answers below.先自己出声答，再看下面的答案。