Java Swing Table API

1. Java Swing Table API

package com.home.swing;

import javax.swing.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import java.awt.*;
import java.util.Map;
import java.util.TreeMap;

public class JSTable {

    public JTable ctrl;
    Runnable selectedHandler;
    int selectedRow = -1;
    Map<Integer,Color> rowFgColor = new TreeMap<>();
    Map<Integer,Color> rowBgColor = new TreeMap<>();

    static class StripedTableCellRenderer extends DefaultTableCellRenderer {
        public Component getTableCellRendererComponent (JTable table, Object value, boolean selected, boolean focused, int row, int column) {
            setEnabled(table == null || table.isEnabled());
            if ((row % 2) == 0) setBackground(Color.green);
            else setBackground(Color.lightGray);
            super.getTableCellRendererComponent(table, value, selected, focused, row, column);
            return this;
        }
    }
    class ColoredTableCellRenderer extends DefaultTableCellRenderer {
        public Component getTableCellRendererComponent (JTable table, Object value, boolean selected, boolean focused, int row, int column) {
            setEnabled(table == null || table.isEnabled());
            Color fg = rowFgColor.get(row);
            Color bg = rowBgColor.get(row);
            if ( fg != null ) { setForeground(fg); } else setForeground(Color.black);
            if ( bg != null ) { setBackground(bg); } else setBackground(Color.white);
            super.getTableCellRendererComponent(table, value, selected, focused, row, column);
            return this;
        }
    }

    public JSTable(String[] colNames, int[] widths, int[] aligns, Runnable handler) {
        DefaultTableModel tableModel = new DefaultTableModel(colNames,0);
        ctrl = new JTable(tableModel) {
            private static final long serialVersionUID = 1L;
            public boolean isCellEditable(int row, int column) {
                return false;
            };
        };
        int colCount = ctrl.getModel().getColumnCount();
        if( widths != null ) {
            for (int col = 0; col < colCount && col < widths.length; col++) {
                ctrl.getColumnModel().getColumn(col).setPreferredWidth(widths[col]);
            }
        }
        if( aligns != null ) {
            for( int col = 0; col < colCount && col < aligns.length; col++ ) {
                //DefaultTableCellRenderer centerRenderer = new DefaultTableCellRenderer();
                ColoredTableCellRenderer centerRenderer = new ColoredTableCellRenderer();
                if( aligns[col] < 0 ) centerRenderer.setHorizontalAlignment( SwingConstants.LEFT );
                if( aligns[col] == 0 ) centerRenderer.setHorizontalAlignment( SwingConstants.CENTER );
                if( aligns[col] > 0 ) centerRenderer.setHorizontalAlignment( SwingConstants.RIGHT );
                ctrl.getColumnModel().getColumn(col).setCellRenderer(centerRenderer);
            }
        }
        selectedHandler = handler;
        ctrl.getSelectionModel().addListSelectionListener(new ListSelectionListener(){
            public void valueChanged(ListSelectionEvent event) {
                if( selectedRow != ctrl.getSelectedRow() ) {
                    selectedRow = ctrl.getSelectedRow();
                    selectedHandler.run();
                }
            }
        });
    }
    public void addRow( String[] row) {
        DefaultTableModel model = (DefaultTableModel) ctrl.getModel();
        model.addRow(row);
    }

    public String[] getSelectedRow() {
        int count = ctrl.getModel().getColumnCount();
        String[] row = new String[count];
        for( int r = 0; r < count; r++ ) {
            row[r] = ctrl.getValueAt( ctrl.getSelectedRow(), r).toString();
        }
        return row;
    }

    public String getValue(int row, int col) {
        return ctrl.getValueAt( row, col).toString();
    }
    public void setValue(int row, int col, String value) {
        ctrl.setValueAt( value, row, col);
    }
    public void setRowColor(int row, Color fg, Color bg) {
        rowFgColor.put(row,fg);
        rowBgColor.put(row,bg);
    }
}