我想更改Java Swing中JButton组件的边框颜色。
我尝试了以下方法:
package com.example.test;
import java.awt.Color;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test extends JFrame {
public Test() {
JPanel panel = new JPanel();
JButton button1 = new JButton("Test Button 1");
JButton button2 = new JButton("Test Button 2");
button2.setBorder(BorderFactory.createLineBorder(Color.RED));
panel.add(button1);
panel.add(button2);
this.add(panel);
setSize(400, 400);
setVisible(true);
}
public static void main(String[] args) {
try {
UIManager.setLookAndFeel( UIManager.getCrossPlatformLookAndFeelClassName() );
} catch (ClassNotFoundException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (UnsupportedLookAndFeelException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
}
Test t = new Test();
}
}
这会生成两个按钮,在button2组件上,我尝试更改边框颜色,但删除了填充。无论如何,是否可以保留标准JButton的原始插图并仅更改颜色?
注意:我假设在分配新的Border时将移除插图。但是我对此不是100%肯定。
答案 0 :(得分:4)
使用LineBorder
代替创建CompoundBorder
:
button2.setBorder(BorderFactory.createCompoundBorder(
BorderFactory.createLineBorder(Color.RED, 1),
BorderFactory.createEmptyBorder(
button1.getBorder().getBorderInsets(button1).top,
button1.getBorder().getBorderInsets(button1).left,
button1.getBorder().getBorderInsets(button1).bottom,
button1.getBorder().getBorderInsets(button1).right)));
我将BorderInsets
换成button1
,以使它们的大小相同。
我的答案基于this question的@MadProgrammer答案
顺便说一句,不要扩展JFrame
,而是创建它的实例,如果您确实需要扩展组件,可以是JPanel
:Extends JFrame vs. creating it inside the program
也别忘了打电话
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
在您的JFrame
实例上,以便您的程序在关闭时终止。
您还错过了将程序放置在EDT上的更多信息,请访问this answer