- 数据类型
boolean
byte char short int long float double
const
void
- 类与对象
package import
class interface abstract enum
implements extends super
final static
new
this
- 访问限制
public protected private
- 执行顺序
for do while
if else
switch case default
continue break
goto
return
- 线程同步
synchronized
volatile
- 异常
try catch finally
throw throws
- 语言层面
assert
instanceof
native
transient
strictfp
