BackgroundCellTableTest.java

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.EventQueue;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Random;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;

public class BackgroundCellTableTest extends JFrame {

	private static final long serialVersionUID = 1L;
	private JPanel contentPane;
	private JScrollPane scrollPane;
	private JTable table;

	public static void main(String[] args) {

		try {
			for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
				if ("Windows".equals(info.getName())) {
					javax.swing.UIManager.setLookAndFeel(info.getClassName());
					break;
				}
			}

			EventQueue.invokeLater(() -> {
				BackgroundCellTableTest frame = new BackgroundCellTableTest();
				frame.setVisible(true);
			});

		} catch (ClassNotFoundException | InstantiationException | IllegalAccessException
				| javax.swing.UnsupportedLookAndFeelException ex) {
			ex.printStackTrace();
		}
	}

	public BackgroundCellTableTest() {
		initComponents();
	}

	private void initComponents() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 570, 466);
		contentPane = new JPanel();
		setContentPane(contentPane);
		
		table = new JTable(new EstoqueTableModel());
		table.getColumnModel().getColumn(1).setCellRenderer(new SaldoTableRenderer());
		contentPane.setLayout(new BorderLayout(0, 0));
		table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
		scrollPane = new JScrollPane(table);
		contentPane.add(scrollPane);
		pack();

	}

}

class EstoqueTableModel extends AbstractTableModel {

    List<Estoque> estoques;
    List<String> colunas = Arrays.asList("PRODUTO", "SALDO");

    public EstoqueTableModel() {
		Random r = new Random();
		estoques = new ArrayList<>();
		for (int i = 1; i <= 10; i++) {
			int s = r.nextInt(3) * i;
			Estoque e = new Estoque("Produto" + i, s);
			estoques.add(e);
		}
    }

    @Override
    public int getRowCount() {
        return estoques.size();
    }

    @Override
    public int getColumnCount() {
        return colunas.size();
    }

    public int getColumnIndex(String coluna) {
        return colunas.indexOf(coluna);
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        Estoque e = estoques.get(rowIndex);
        String columnName = getColumnName(columnIndex);
        switch(columnName) {
            case "PRODUTO": return e.getNomeProduto();
            case "SALDO": return e.getSaldo();
        }
        return null;
    }

    @Override
    public String getColumnName(int column) {
        return colunas.get(column);
    }



    public List<Estoque> getEstoques() {
        return estoques;
    }
}

class Estoque {
	
    private String nomeProduto;
    private int saldo;

    public Estoque(String nomeProduto, int saldo) {
        this.nomeProduto = nomeProduto;
        this.saldo = saldo;
    }

    public String getNomeProduto() {
        return nomeProduto;
    }

    public void setNomeProduto(String nomeProduto) {
        this.nomeProduto = nomeProduto;
    }

    public int getSaldo() {
        return saldo;
    }

    public void setSaldo(int saldo) {
        this.saldo = saldo;
    }
}

class SaldoTableRenderer extends DefaultTableCellRenderer {
	
	Color defaultBackground, defaultForeground;

	public SaldoTableRenderer() {
		this.defaultBackground = getBackground();
		this.defaultForeground = getForeground();
		setHorizontalAlignment(javax.swing.JLabel.RIGHT);
	}

	@Override
	public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
			int row, int column) {
		final Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

			Integer saldo = (int) value;

			if (saldo <= 0) {
				c.setBackground(Color.red);
				c.setForeground(Color.white);
			}else{
				c.setBackground(defaultBackground);
				c.setForeground(defaultForeground);				
			}
			setText(saldo.toString());

		return c;
	}

}