js: event
word-break:
The word-break property specifies line breaking rules for non-CJK scripts.
Tip: CJK scripts are Chinese, Japanese and Korean ("CJK") scripts.
word-wrap:
The word-wrap property allows long words to be able to be broken and wrap onto the next line.
Java:
1. List<?>:無法賦值，，add(new Object())//編譯錯誤
2. List<? extends Shape>:無法添加元素