Java 如何在 JFrame 中居中对齐标题？

How to center align the title in a JFrame?

提问by wishman

I have a JFrame with a Title. I want center align the title, so that it appears in the middle of the JFrame's title.

我有一个带有 Title的JFrame。我想居中对齐 title，以便它出现在JFrame 的 title 中间。

Thanks.

谢谢。

采纳答案by Java42

Consider leaving the title left-justified...but...this will get you near the center. For resizable frames, you need to rewrite the title on resize.

考虑让标题左对齐……但是……这会让你靠近中心。对于可调整大小的框架，您需要在调整大小时重写标题。

JFrame t = new JFrame();
t.setSize(600,300);
t.setFont(new Font("System", Font.PLAIN, 14));
Font f = t.getFont();
FontMetrics fm = t.getFontMetrics(f);
int x = fm.stringWidth("Hello Center");
int y = fm.stringWidth(" ");
int z = t.getWidth()/2 - (x/2);
int w = z/y;
String pad ="";
//for (int i=0; i!=w; i++) pad +=" "; 
pad = String.format("%"+w+"s", pad);
t.setTitle(pad+"Hello Center");

回答by blackcompe

I don't know that you can without using a complicated scheme. If it's to your liking, you could apply a titled border with centered text to the frame's content pane.

我不知道你可以不使用复杂的方案。如果您喜欢，您可以将带有居中文本的标题边框应用到框架的内容窗格。

回答by mKorbel

I have a JFrame with a Title. I want center align the title, so that 
it appears in the middle of the JFrame's title.

simple not possible to centering narrarive in the JFrames TitleBar, this container came from Native OS

简单不可能将叙述居中JFrames TitleBar，这个容器来自Native OS

• dirty hack are possible by implements getSystemLookAndFeelin Windows OS

• create undecorated JFrameby adding JPanel(simulated Toolbar) with JButtons (JButtons with icons simulating standards buttons )

• getSystemLookAndFeelWindows 操作系统中的工具可以进行脏黑客攻击

• JFrame通过添加JPanel（模拟Toolbar）与 JButton（带有模拟标准按钮的图标的 JButton）来创建未修饰的

回答by Blastoise Opressor

Adapting the answer's sourceof @Java42, I did a "workaround" to adjust title when resizing JFrame:

调整@Java42的答案来源，我做了一个“解决方法”来调整JFrame大小时调整标题：

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;

import javax.swing.JFrame;


public class JFrameTitleCenter {

    public void createAndShowGUI() {

        JFrame frame = new JFrame();
        frame.setPreferredSize(new Dimension(300, 200));
        frame.setTitle("Hello Center");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.addComponentListener(new ComponentAdapter() {
            @Override
            public void componentResized(ComponentEvent e) {
                titleAlign(frame);
            }

        });

        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);

    }

    private void titleAlign(JFrame frame) {

        Font font = frame.getFont();

        String currentTitle = frame.getTitle().trim();
        FontMetrics fm = frame.getFontMetrics(font);
        int frameWidth = frame.getWidth();
        int titleWidth = fm.stringWidth(currentTitle);
        int spaceWidth = fm.stringWidth(" ");
        int centerPos = (frameWidth / 2) - (titleWidth / 2);
        int spaceCount = centerPos / spaceWidth;
        String pad = "";
        pad = String.format("%" + (spaceCount - 14) + "s", pad);
        frame.setTitle(pad + currentTitle);

    }

    public static void main(String[] args) {

        EventQueue.invokeLater(() -> {
            new JFrameTitleCenter().createAndShowGUI();
        });
    }
}

Working:

在职的：

回答by Chauncey Lee

center align the title in a jFrame is very easy in netbeans, what u need to do is below:

在 netbeans 中将 jFrame 中的标题居中对齐非常容易，您需要做的如下：

1.

1.

2.

2.

1. run your app.

3. 运行您的应用程序。