在JFrame上使用图形对象绘制文本

问题描述

我是一个狂热的程序员，但是今天是我的第一堂Java课。

I am an avid programmer but today is my first Java lesson.

public void Paint (Graphics g)
{
    if(g instanceof Graphics2D)
    {
        Graphics2D g2d = (Graphics2D)g;
        g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
    }
    g.drawString("This is gona be awesome", 200, 200);
}

使用上面的代码，我想在窗口上写一个句子，但是从不写。我在做什么错？

With the above code, I want to write a sentence on the window but it never writes. What am I doing wrong?

编辑：没关系-油漆一定是油漆。我深表歉意。

Never mind - Paint must be paint. I apologize profusely.

推荐答案

在给定的代码中，您想要的是

In the given code, what you want is

 g2d.drawString("This is gona be awesome", 200, 200);
  ^

---

您的工作示例参考：

---

A working example for your reference :

package Experiments;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;

import javax.swing.JComponent;
import javax.swing.JFrame;

public class MainClass{
  public static void main(String[] args) {
    JFrame jf = new JFrame("Demo");
    Container cp = jf.getContentPane();
    MyCanvas tl = new MyCanvas();
    cp.add(tl);
    jf.setSize(300, 200);
    jf.setVisible(true);
  }
}

class MyCanvas extends JComponent {

  @Override
  public void paintComponent(Graphics g) {
      if(g instanceof Graphics2D)
      {
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
        RenderingHints.VALUE_ANTIALIAS_ON);

        g2.drawString("This is gona be awesome",70,20);
       }
   }
}

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