Java图形将不会显示

Question

下面是我的代码：

package survival;
import javax.swing.*;
import java.awt.*;

public class Survival extends JFrame { 
    private static int applicationWidth = 1400;
    private static int applicationHeight = 900;  

    public Survival() {
        setTitle("Survival");
        setResizable(false);
        setSize(applicationWidth, applicationHeight);
        setVisible(true);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    public void paint(Graphics g) {
        g.drawString("Test", 0, 0);
    }

    public static void main(String[] args) {
        new Survival();
    }
}

为什么"Test“没有出现？

Answer 1

您需要调用超类的paint()方法。(文章- Painting in AWT and Swing)

 public Survival() {
        setTitle("Survival");
        setResizable(false);
        setSize(applicationWidth, applicationHeight);
        setVisible(true);

        setDefaultCloseOperation(EXIT_ON_CLOSE);
        repaint();
    }

    public void paint(Graphics g) {
        super.paint(g);    
        g.drawString("Test", 120, 120); //change the co-odrinates
    }

覆盖JPanel的paintComponent。

 public Survival() {
        setTitle("Survival");
        setResizable(false);
        setSize(applicationWidth, applicationHeight);
        setVisible(true);
        add(new DrawPanel());
        setDefaultCloseOperation(EXIT_ON_CLOSE);
     }

   class DrawPanel extends JPanel
   {
    @Override
    protected  void paintComponent( Graphics g){
       g.drawString("Test", 220,220);
      }
   }

Answer 2

请勿覆盖paint。无论何时自定义组件，都要覆盖paintComponent。

示例-

@Override
protected final void paintComponent(final Graphics g){
    super.paintComponent(g);
    final Graphics gCopy = g.create(); // Prevents clobbering
    gCopy.drawString("Test", 0, 0);
    gCopy.dispose();
}