我尝试了 add() 方法,但在试图将 Test 添加到 GraphicsTest 时未显示任何内容。 我应该如何添加它? 能否有人给我演示一下? 我已经包含了我正在使用的代码。
这是我的方式,但它不起作用。 能否有人向我展示或让我知道实际问题是什么?
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JComponent;
public class Test extends JComponent
{
@Override
public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.setColor(Color.red);
g2d.drawString("Hello", 50, 50);
g2d.dispose();
}
}
这是另一个类:
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import javax.swing.JPanel;
public class GraphicsTest extends JPanel
{
private Graphics2D g2d;
private String state;
private int x, y;
GraphicsTest()
{
Test t = new Test();
t.setVisible(true);
add(t);
}
@Override
public void paintComponent(Graphics g)
{
super.paintComponent(g);
g2d = (Graphics2D) g;
g2d.setColor(Color.BLACK);
g2d.drawString("STATE: " + state, 5, 15);
g2d.drawString("Mouse Position: " + x + ", " + y, 5, 30);
g2d.setColor(Color.red);
Rectangle2D r2d = new Rectangle2D.Double(x, y, 10, 10);
g2d.draw(r2d);
g2d.dispose();
}
public void setState(String state) { this.state = state; }
public String getState() { return state; }
public void setX(int x) { this.x = x; repaint(); }
public void setY(int y) { this.y = y; repaint(); }
}