java - How to make JLabel still appear after JTable column swap in the runtime? -
i have jtable:
after swap columns unfortunately flags not rendered anymore:
i assume fault of getcolumnclass method have fixed class every column, don't know how fix issue.
package zad1; import java.awt.borderlayout; import java.awt.color; import java.awt.component; import java.awt.image; import java.awt.image.bufferedimage; import java.io.bufferedreader; import java.io.file; import java.io.filereader; import java.util.arrays; import java.util.vector; import javax.imageio.imageio; import javax.swing.icon; import javax.swing.imageicon; import javax.swing.jlabel; import javax.swing.jpanel; import javax.swing.jtable; import javax.swing.table.defaulttablemodel; import javax.swing.table.tablecellrenderer; import javax.swing.table.tablemodel; public class countrytable extends jtable { public countrytable(string countriesfilename) { vector<string> columnnames = new vector<string>(); vector<vector<object>> data = new vector<vector<object>>(); try { bufferedreader br = new bufferedreader(new filereader(countriesfilename)); columnnames.addall(arrays.aslist(br.readline().split("\t"))); system.out.println(columnnames); string line; while ((line = br.readline()) != null) { string[] attributes = line.split("\t"); vector<object> rowdata = new vector<object>(); rowdata.add(attributes[0]); rowdata.add(attributes[1]); rowdata.add(long.valueof(attributes[2])); bufferedimage icon = imageio.read(new file("./data/" + attributes[3])); double ratio = (double) icon.getwidth() / icon.getheight(); rowdata.add(new imageicon(icon.getscaledinstance(30, 20, image.scale_fast))); data.add(rowdata); } br.close(); } catch (exception e) { e.printstacktrace(); } setmodel(new mytablemodel(data, columnnames)); setrowheight(30); getcolumnmodel().getcolumn(2).setcellrenderer(new populationcellrenderer()); (int = 0; < getcolumncount(); i++) { getcolumnmodel().getcolumn(i).setwidth(400); } } @override public class getcolumnclass(int column) { switch (column) { case 0: return string.class;// panstwo case 1: return string.class;// stolica case 2: return long.class;// ludnosc case 3: return icon.class; // flaga jakiej klasy jest dana komorka w danej kolumnie aby tabela ja poprawnie wyswietlila default: return string.class; } } class mytablemodel extends defaulttablemodel { public mytablemodel(vector<vector<object>> data, vector<string> columnnames) { super(data, columnnames);//wywolanie konstruktora z nadklasy system.out.println(columnnames); } @override public boolean iscelleditable(int row, int column) { return column == 3; } } class populationcellrenderer extends jlabel implements tablecellrenderer { @override public component gettablecellrenderercomponent(jtable table, object value, boolean isselected, boolean hasfocus, int row, int column) { long population = (long) value; sethorizontalalignment(jlabel.right); if (population > 20000000) { setforeground(color.red); } else { setforeground(color.black); } settext(population + ""); return this; } } }
there's no need extend jtable this. example overrides getcolumnclass() in view, when should in model. default renderer icon.class applied wherever column moved.
private final tablemodel model = new defaulttablemodel(data, columnnames) { @override public class<?> getcolumnclass(int column) { switch (column) { … } } }; this make possible apply populationcellrenderer on per-type basis:
table.setdefaultrenderer(long.class, new populationrenderer()); also consider extending defaulttablecellrenderer, shown here, using numberformat, shown below. based on example @mkorbel, self-contained code below shows corrected tablemodel , updated tablecellrenderer.
import java.awt.*; import java.text.numberformat; import javax.swing.*; import javax.swing.table.*; public class tableexample { private static final long cusp = 20000000; private jframe frame = new jframe("table demo"); private icon erroricon = (icon) uimanager.geticon("optionpane.erroricon"); private icon infoicon = (icon) uimanager.geticon("optionpane.informationicon"); private icon warnicon = (icon) uimanager.geticon("optionpane.warningicon"); private string[] columnnames = {"string", "long", "float", "double", "boolean", "icon"}; private object[][] data = { {"aaa", cusp - 1, 12.15f, 100.05, true, (erroricon)}, {"bbb", cusp, 7.154f, 6.1555, false, (infoicon)}, {"ccc", cusp + 1, 0.1135f, 3.1455, true, (warnicon)}, {"ddd", 42l, 31.15f, 10.05, true, (erroricon)}, {"eee", 12345l, 5.154f, 16.1555, false, (infoicon)}, {"fff", 54321l, 4.1135f, 31.1455, true, (warnicon)}}; private final tablemodel model = new defaulttablemodel(data, columnnames) { @override public class<?> getcolumnclass(int column) { switch (column) { case 0: return string.class; case 1: return long.class; case 2: return float.class; case 3: return double.class; case 4: return boolean.class; case 5: return icon.class; default: return string.class; } } }; private final jtable table = new jtable(model); private static class populationrenderer extends defaulttablecellrenderer { numberformat f = numberformat.getinstance(); @override public component gettablecellrenderercomponent(jtable table, object value, boolean isselected, boolean hasfocus, int row, int col) { jlabel r = (jlabel) super.gettablecellrenderercomponent( table, value, isselected, hasfocus, row, col); if (col == 1) { r.sethorizontalalignment(jlabel.right); long population = (long) value; if (population > cusp) { r.setforeground(color.red); } else { r.setforeground(color.black); } r.settext(f.format(population)); } return r; } } public tableexample() { int h = infoicon.geticonheight(); table.setrowheight(h); table.setpreferredscrollableviewportsize( new dimension(table.getpreferredsize().width, 4 * h)); table.setautocreaterowsorter(true); table.setdefaultrenderer(long.class, new populationrenderer()); frame.setdefaultcloseoperation(jframe.exit_on_close); frame.add(new jscrollpane(table)); frame.pack(); frame.setlocationbyplatform(true); frame.setvisible(true); } public static void main(string[] args) { eventqueue.invokelater(() -> { tableexample tableexample = new tableexample(); }); } } 
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