Java Swing - 如何设置渲染器提示

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import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagLayout;
import java.awt.Image;
import java.awt.RenderingHints;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class Main extends JFrame {
  MyPanel myComponent = new MyPanel();
  JLabel contentPane = new JLabel("test");
  Main() {
    contentPane.setLayout(new GridBagLayout());
    setContentPane(contentPane);
    add(myComponent);
  }
  public static void main(String[] args) {
    Main rc = new Main();
    rc.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    rc.pack();
    rc.setVisible(true);
  }
}
class MyPanel extends JPanel {
  private String target;
  private String raised = "200000";
 
 
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