import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.FontMetrics;
import java.awt.Graphics;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;

class BiColorLabel extends JLabel {

    private Color leftColor, rightColor;
    private String text;
    private int alignment;

    public BiColorLabel(Color leftColor, Color rightColor) {
        this("", LEFT, leftColor, rightColor);
    }

    public BiColorLabel(int alignment, Color leftColor, Color rightColor) {
        this("", alignment, leftColor, rightColor);
    }

    public BiColorLabel(String text, Color leftColor, Color rightColor) {
        this(text, LEFT, leftColor, rightColor);
    }

    public BiColorLabel(String text, int alignment, Color leftColor,
            Color rightColor) {
        super(text);
        this.text = text;
        this.alignment = alignment;
        this.leftColor = leftColor;
        this.rightColor = rightColor;
        updateUI();
    }

    public void paintComponent(Graphics g) {
        if (leftColor == null)
            leftColor = getBackground();
        if (rightColor == null)
            rightColor = getBackground();
        g.setColor(leftColor);
        g.fillRect(0, 0, this.getWidth() / 2, this.getHeight());
        g.setColor(rightColor);
        g.fillRect(this.getWidth() / 2, 0, this.getWidth() / 2,
                this.getHeight());
        g.setColor(Color.BLACK);
        // Grundlinie ermitteln
        FontMetrics fm = this.getFontMetrics(getFont());
        int vPos = this.getHeight() / 2 + fm.getHeight() / 2 - fm.getDescent();
        if (alignment == SwingConstants.RIGHT) {
            g.drawString(text, this.getWidth() - fm.stringWidth(text), vPos);
        } else if (alignment == SwingConstants.CENTER) {
            g.drawString(text, this.getWidth() / 2 - fm.stringWidth(text) / 2,
                    vPos);
        } else {
            g.drawString(text, 0, vPos);
        }
    }
}

public class BiColorLabelBsp {
    
    public BiColorLabelBsp() {
        init();
    }
    
    private void init() {
        JFrame frame = new JFrame("BiColorLabel");
        frame.setLayout(new FlowLayout());
        BiColorLabel bcl = new BiColorLabel("ene mene muh", SwingConstants.CENTER, new Color(255,240, 230),
                new Color(220, 255, 230));
        bcl.setPreferredSize(new Dimension(300, 30));
        frame.add(bcl);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
    
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> new BiColorLabelBsp());
    }
}