我想将读取lucene索引的结果存储到jTable中,以便我可以通过不同的列对其进行排序.从索引我正在阅读具有不同频率度量的术语.
表列是这些：
[string term] [int absFrequency] [int docFrequency] [double invFrequency]
所以我在AbstractTableModel中我可以定义列名,但我不知道如何使用以下方法得到Object [] []数据：
public static void FrequencyMap(Directory indexDir) throws Exception
{
List<ArrayList>redoviLista = new ArrayList<ArrayList>();
//final Map<String,TermRow> map = new TreeMap<String,TermRow>();
List<String>termlist = new ArrayList<String>();
IndexReader iReader = IndexReader.open(indexDir);
FilterIndexReader fReader = new FilterIndexReader(iReader);
int numOfDocs = fReader.numDocs();
TermEnum terms = fReader.terms();
while (terms.next()){
Term term = terms.term();
String termText = term.text();
termlist.add(termText);
//Calculating the frequencies
int df = iReader.docFreq(term);
double idf = 0.0F;
idf = Math.log10((double) numOfDocs / df);
double tfidf = (df*idf);
//Here comes important part
//Changes according to takoi's answer
ArrayList<Object> oneRow = new ArrayList<Object>();
oneRow.add(termText);
oneRow.add(df);
oneRow.add(idf);
oneRow.add(tfidf);
redoviLista.add(oneRow);
}
iReader.close();
// So I need something like this,and i Neeed this array to be stored out of this method
所以我很友好地坚持在这里继续实现AbstractTableModel并填充并显示这个表….：/
请帮忙！
解决方法
在模型中插入,删除或更新数据时,需要通知GUI更改.您可以使用
AbstractTableModel中的fire-methods执行此操作.
即如果向列表中添加元素,则还必须调用fireTableRowsInserted(int firstRow,int lastRow),以便可以更新可见图层.
在下面的代码中查看addElement(MyElement e)：
public class MyModel extends AbstractTableModel {
private static final String[] columnNames = {"column 1","column 2"};
private final LinkedList<MyElement> list;
private MyModel() {
list = new LinkedList<MyElement>();
}
public void addElement(MyElement e) {
// Adds the element in the last position in the list
list.add(e);
fireTableRowsInserted(list.size()-1,list.size()-1);
}
@Override
public int getColumnCount() {
return columnNames.length;
}
@Override
public int getRowCount() {
return list.size();
}
@Override
public Object getValueAt(int rowIndex,int columnIndex) {
switch(columnIndex) {
case 0: return list.get(rowIndex).getColumnOne();
case 1: return list.get(rowIndex).getColumnOne();
}
return null;
}
}