类的构造函数，什么时候执行，是在new 新类的时候吗？

[qiandeng]

[hexiaofeng]

Button b = new Button();
new 新类的时候执行类的构造函数

[qiandeng]

为什么我自己定义的类没有执行？

[hexiaofeng]

代码???

[qiandeng]

public class ResultSetToXML {
static String ADOHead;
static String RowsetSchema;
static String _ADOHead;
static String _RowsetSchema;
private ResultSet xmlResultSet;
private String FieldInfo;
private String DataInfo;
private String xmlString;

public void ResultSetToXML() {
}
public void ResultSetToXML(ResultSet rs) {
ADOHead = "<xml xmlns:s='uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882'\n\r";
ADOHead = ADOHead + " xmlns:dt='uuid:C2F41010-65B3-11d1-A29F-00AA00C14882'\n\r";
ADOHead = ADOHead + " xmlns:rs='urn:schemas-microsoft-com:rowset'\n\r";
ADOHead = ADOHead + " xmlns:z='#RowsetSchema'>\n\r";
RowsetSchema = "<s:Schema id='RowsetSchema'>\n\r <s:ElementType name='row' > ";
_ADOHead = " </rs:data>\n\r </xml>";
_RowsetSchema = " </s:ElementType>\n\r </s:Schema>\n\r <rs:data>\n\r";
xmlResultSet = rs;
}
public void setResultSet(ResultSet rs){
xmlResultSet = rs;
}
private void setFieldInfo(){
FieldInfo = "";
try{
for (int i = 1 ;i<=xmlResultSet.getMetaData().getColumnCount() ; i++){
FieldInfo = "<s:AttributeType name='" + xmlResultSet.getMetaData().getColumnName(i) + "'";
FieldInfo = FieldInfo + " rs:number='" + String.valueOf(i) + "'>\n\r";
FieldInfo = FieldInfo + " <s:datatype dt:type='" + xmlResultSet.getMetaData().getColumnTypeName(i) + "'";
FieldInfo = FieldInfo + " dt:maxLength='" + String.valueOf(xmlResultSet.getMetaData().getColumnDisplaySize(i)) + "'/>\n\r";
FieldInfo = FieldInfo + " </s:AttributeType>";
}
} catch(Exception e){

}
}
private void setDataInfo(){
try{
DataInfo = "";
// xmlResultSet.first();
String DataRow;
while (xmlResultSet.next()) {
DataRow = "<z:row ";
for (int i = 1 ;i<=xmlResultSet.getMetaData().getColumnCount();i++){
DataRow = DataRow + xmlResultSet.getMetaData().getColumnName(i) + "='" + xmlResultSet.getString(i) + "' ";
}
DataRow = DataRow + " />";
DataInfo = DataInfo + DataRow;
}
}catch(Exception e){
;
} //end try
}

private void produceXMLString(){
setFieldInfo();
setDataInfo();
xmlString = ADOHead + RowsetSchema + FieldInfo + _RowsetSchema + DataInfo + _ADOHead ;
}
public String getXMLString(){
produceXMLString();
return xmlString;
}

[rinehart]

public ResultSetToXML() {
}
public ResultSetToXML(ResultSet rs) {
ADOHead = "<xml xmlns:s='uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882'\n\r";
ADOHead = ADOHead + " xmlns:dt='uuid:C2F41010-65B3-11d1-A29F-00AA00C14882'\n\r";
ADOHead = ADOHead + " xmlns:rs='urn:schemas-microsoft-com:rowset'\n\r";
ADOHead = ADOHead + " xmlns:z='#RowsetSchema'>\n\r";
RowsetSchema = "<s:Schema id='RowsetSchema'>\n\r <s:ElementType name='row' > ";
_ADOHead = " </rs:data>\n\r </xml>";
_RowsetSchema = " </s:ElementType>\n\r </s:Schema>\n\r <rs:data>\n\r";
xmlResultSet = rs;
}

构造函数没有返回值!

[qiandeng]

上面那个太大了。我从发
public class ResultSetToXML {
static String ADOHead;
static String RowsetSchema;
static String _ADOHead;
static String _RowsetSchema;
private ResultSet xmlResultSet;
private String FieldInfo;
private String DataInfo;
private String xmlString;

public void ResultSetToXML() {
ADOHead = "<xml xmlns:s='uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882'\n\r";
ADOHead = ADOHead + " xmlns:dt='uuid:C2F41010-65B3-11d1-A29F-00AA00C14882'\n\r";
ADOHead = ADOHead + " xmlns:rs='urn:schemas-microsoft-com:rowset'\n\r";
ADOHead = ADOHead + " xmlns:z='#RowsetSchema'>\n\r";
RowsetSchema = "<s:Schema id='RowsetSchema'>\n\r <s:ElementType name='row' > ";
_ADOHead = " </rs:data>\n\r </xml>";
_RowsetSchema = " </s:ElementType>\n\r </s:Schema>\n\r <rs:data>\n\r";
}
}

[hexiaofeng]

public void ResultSetToXML() {
改为

public ResultSetToXML() {

[紫焰月读]

去除函数的类型