java reserved words and keywords
java keywords 51
Keywords are lowercase, friendly, sizeof keyword is not java
| No. |
Keyword |
meaning |
| 1 |
abstract |
Modification classes, methods, become an abstract class, abstract method |
| 2 |
assert |
Used to query internal program error |
| 3 |
boolean |
One of the basic data types, Boolean typed |
| 4 |
break |
Out of a switch or the end of a loop |
| 5 |
byte |
One of the basic data types, 8-bit integer |
| 6 |
case |
A branch of the switch statement |
| 7 |
catch |
Capture try block exception clause |
| 8 |
char |
One of the basic data types, character type |
| 9 |
class |
The definition of a class |
| 10 |
const |
Unused |
| 11 |
continue |
Skip the loop portion of the back of the continue statement, the next one into the loop |
| 12 |
default |
switch the default clause |
| 13 |
do |
do / while loop foremost statement |
| 14 |
double |
One of the basic data type, double precision floating point |
| 15 |
else |
else if statement clause |
| 16 |
enum |
Enum type |
| 17 |
extends |
Show a typed is another type other sub-typed |
| 18 |
final |
A constant, or not covered in a class or illegal |
| 19 |
finally |
Will always try block portion performed |
| 20 |
float |
One of the basic data types, single-precision floating-point number |
| 21 |
for |
A kind 迴圈 typing |
| 22 |
goto |
Unused |
| 23 |
if |
A conditional statement |
| 24 |
implements |
Define a class that implements interface |
| 25 |
import |
Importing a package |
| 26 |
instanceof |
Determining whether an object instance of a class |
| 27 |
int |
One of the basic data types, 32-bit integer |
| 28 |
interface |
Abstract types, which may be implemented by a method comprising the class |
| 29 |
long |
One of the basic data types, 64-bit long integer |
| 30 |
native |
Is used to declare a method is implemented by the language associated with the computer (e.g., C / C ++ / FORTRAN language) |
| 31 |
new |
To create a new instance of the object |
| 32 |
null |
A null reference |
| 33 |
package |
Package comprising a class |
| 34 |
private |
An access control, private mode, can only be accessed by methods of the class |
| 35 |
protected |
An access control mode, protected mode, accessible only by methods of the class, subclass and with bags of |
| 36 |
public |
An access control, total mode, all class methods can access |
| 37 |
return |
Return from a method |
| 38 |
short |
基本資料型別之一，16位短整型 |
| 39 |
static |
表明具有靜態屬性，屬於類，不屬於類的物件 |
| 40 |
strictfp |
對浮點數計算使用嚴格的規則 |
| 41 |
super |
超類物件或建構函式 |
| 42 |
switch |
一個選擇語句 |
| 43 |
synchronized |
對執行緒而言是原子的方法或程式碼塊 |
| 44 |
this |
當前類的一個方法或建構函式的隱含引數 |
| 45 |
throw |
丟擲一個異常 |
| 46 |
throws |
一個方法可能丟擲的異常 |
| 47 |
transient |
標誌非永久的資料 |
| 48 |
try |
捕獲異常的程式碼塊 |
| 49 |
void |
修飾方法，表示無返回值 |
| 50 |
volatile |
確保一個欄位可以由多個執行緒訪問 |
| 51 |
while |
一種迴圈 |
java的保留字（2個）
| 编号 | 保留字 |
|
| 1 | goto | 無任何作用，因為用goto作為關鍵字會影響代碼的可讀性 |
| 2 | const | 未知 |
| 3 | byValue | 未知 |
| 4 | cast | 未知 |
| 5 | var | 未知 |
| 6 | future | 未知 |
| 7 | generic | 未知 |
| 8 | inner | 未知 |
| 9 | operator | 未知 |
| 10 | outer | 未知 |
| 11 | rest | 未知 |
| 12 | false | 未知 |
| 13 | true | 未知 |
| 14 | null | 未知 |
java的標誌符（3個）
| 编号 | 標誌符 | |
| 1 | null | 表示空值，short、int、long、char、float、double、boolean變量。 |
| 2 | true | 表示 boolean 值倆個的其中一個。 |
| 3 | false | 表示boolean 值倆個其中的一個。 |
