如何在新框架中显示消息?(How to display a message in a new frame?)
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小牛编辑
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2023-12-01
问题描述 (Problem Description)
如何在新框架中显示消息?
解决方案 (Solution)
下面的示例演示如何通过使用JFrame()创建框架并使用JFrames getContentPanel(),setSize()和setVisible()方法显示此框架来在新框架中显示消息。
import java.awt.*;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Main extends JPanel {
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setFont(new Font("Serif", Font.PLAIN, 48));
paintHorizontallyCenteredText(g2, "Java Source", 200, 75);
paintHorizontallyCenteredText(g2, "and", 200, 125);
paintHorizontallyCenteredText(g2, "Support", 200, 175);
}
protected void paintHorizontallyCenteredText(
Graphics2D g2, String s, float centerX, float baselineY) {
FontRenderContext frc = g2.getFontRenderContext();
Rectangle2D bounds = g2.getFont().getStringBounds(s, frc);
float width = (float) bounds.getWidth();
g2.drawString(s, centerX - width/2, baselineY);
}
public static void main(String[] args) {
JFrame f = new JFrame();
f.getContentPane().add(new Main());
f.setSize(450, 350);
f.setVisible(true);
}
}
结果 (Result)
上面的代码示例将产生以下结果。
JAVA and J2EE displayed in a new Frame.
以下是在新帧中显示消息的示例。
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Component;
import java.awt.Frame;
import java.awt.TextArea;
public class Main {
public static void main(String[] args) {
Frame f = new Frame("xnip");
Component text = new TextArea("Sairamkrishna Mamamahe");
Component button = new Button("Button");
f.add(text, BorderLayout.NORTH);
f.add(button, BorderLayout.SOUTH);
int width = 300;
int height = 300;
f.setSize(width, height);
f.setVisible(true);
}
}