3Methos is missing a javadoc comment方法前面缺少javadoc注釋
4Expected @throws tag for “Exception”在注釋中希望有@throws的說明
5“.” Is preceeded with whitespace “.” 前面不能有空格
6“.” Is followed by whitespace“.” 后面不能有空格
7“=” is not preceeded with whitespace“=” 前面缺少空格
8“=” is not followed with whitespace“=” 后面缺少空格
9“}” should be on the same line“}” 應該與下條語句位于同一行
10Unused @param tag for “unused”沒有參數“unused”，不需注釋
11Variable “CA” missing javadoc變量“CA”缺少javadoc注釋
12Line longer than 80characters行長度超過80
13Line contains a tab character行含有”tab” 字符
14Redundant “Public” modifier冗余的“public” modifier
15Final modifier out of order with the JSL suggestionFinal modifier的順序錯誤
16Avoid using the “.*” form of importImport格式避免使用“.*”
17Redundant import from the same package從同一個包中Import內容
18Unused import-java.util.listImport進來的java.util.list沒有被使用
19Duplicate import to line 13重復Import同一個內容
20Import from illegal package從非法包中 Import內容
21“while” construct must use “{}”“while” 語句缺少“{}”
22Variable “sTest1” must be private and have accessor method變量“sTest1”應該是private的，并且有調用它的方法
23Variable “ABC” must match pattern “^[a-z][a-zA-Z0-9]*$”變量“ABC”不符合命名規則“^[a-z][a-zA-Z0-9]*$”
24“(” is followed by whitespace“(” 后面不能有空格 25“)” is proceeded by whitespace“)” 前面不能有空格
Kevin.Zhong 2008-11-06 11:27 發表評論
]]>2) -charset charsetName
第一個參數表示javadoc 程序讀取java源文件時候應該采用什么編碼
第二個參數表示javadoc 程序寫html文件時采用的編碼形式,并會在HTML中加入如下標簽
網管下載dl.bitscn.com
1 
<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd" >
2 <!-- NewPage -->
3 < HTML >
4 < HEAD >
5 <!-- Generated by javadoc (build 1.5.0) on Thu Feb 01 21:10:10 CST 2007 -->
6 <!-- -這下面的charset隨編碼的不同而不同,這里面為utf-8編碼-- -->
7 < META http-equiv ="Content-Type" content ="text/html; charset=utf-8" >
<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd" > 2
<!-- NewPage --> 3
< HTML > 4
< HEAD > 5
<!-- Generated by javadoc (build 1.5.0) on Thu Feb 01 21:10:10 CST 2007 --> 6
<!-- -這下面的charset隨編碼的不同而不同,這里面為utf-8編碼-- --> 7
< META http-equiv ="Content-Type" content ="text/html; charset=utf-8" > 如果文件格式為UTF8格式的,可以采用如下形式進行Generate Javadoc:
javadoc -encoding UTF-8 -charset UTF-8 <other params>
Kevin.Zhong 2008-11-05 14:53 發表評論
]]>ArrayList 默認的大小為 10
ArrayList源代碼:
/**
* Constructs an empty list with an initial capacity of ten.
*/
public ArrayList() {
this(10);
}
* Constructs an empty list with an initial capacity of ten.
*/
public ArrayList() {
this(10);
}
HashSet默認大小與HashMap一樣 為 16 (因為HashSet就是使用HashMap的key來保存對象)
HashMap源代碼:
static final int DEFAULT_INITIAL_CAPACITY = 16;
/**
* Constructs an empty <tt>HashMap</tt> with the default initial capacity
* (16) and the default load factor (0.75).
*/
public HashMap() {
this.loadFactor = DEFAULT_LOAD_FACTOR;
threshold = (int)(DEFAULT_INITIAL_CAPACITY * DEFAULT_LOAD_FACTOR);
table = new Entry[DEFAULT_INITIAL_CAPACITY];
init();
}
/**
* Constructs an empty <tt>HashMap</tt> with the default initial capacity
* (16) and the default load factor (0.75).
*/
public HashMap() {
this.loadFactor = DEFAULT_LOAD_FACTOR;
threshold = (int)(DEFAULT_INITIAL_CAPACITY * DEFAULT_LOAD_FACTOR);
table = new Entry[DEFAULT_INITIAL_CAPACITY];
init();
}
Kevin.Zhong 2008-10-10 11:15 發表評論
]]>Returns a hash code value for the object. This method is supported for the benefit of hashtables such as those provided by java.util.Hashtable.
從注釋上可以知道，hashCode可用于如Hashtable,HashMap這些集合對象，它通過hashCode對集合中的元素進行
散列處理,這樣在查找時，通過hashCode可以很迅速的進行對象的查找操作。
However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hashtables.
但是每位PG需要知道，如果不對Object的hashCode對象復寫，則其它生成規則是根據內部的指針地址來算出hashCode。(這一點大家得特別注意)
下面是eclipse生成代碼的一個示例:
public int hashCode() {
final int prime = 31;
int result = super.hashCode();
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}
final int prime = 31;
int result = super.hashCode();
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}
它的問題就是，result中調用了 *super.hashCode()。*這么一來，同一個類被實例化多次后，雖然它們的名稱都相同
但生成的hashCode都不同，當然在那些集合類中使用返回的也會有問題了。
Kevin.Zhong 2008-10-10 10:52 發表評論
]]>