java中swing控件的默认Border是什么呀

Question

setBorder(BorderFactory.createEmptyBorder())

Answer 1

楼上的那样的方法，JButton就没有边界了，只有文字了。

Answer 2

setBorder(BorderFactory.createEtchedBorder())

Answer 3

下面的代码边界去了再加上去，就设置不了它的边距了import java.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;public class TestBorder extends JFrame {
public static void main(String[] args) {
new TestBorder();

//List list=ArrayList(
} public TestBorder() {
JButton jb=new JButton("Button");
Container c=getContentPane();
jb.setBorder(BorderFactory.createEmptyBorder());
c.setLayout(new FlowLayout());
c.add(jb);
jb.setMargin(new Insets(50,25,10,5));//这里怎么设置不了它的边距
jb.setBorder(BorderFactory.createEtchedBorder());
setSize(320,240);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
}

Answer 4

JButton jb=new JButton("Button");
                        Container c=getContentPane();
                        c.setLayout(new FlowLayout());
                        c.add(jb);                        Border border = jb.getBorder();
                        Insets insets = jb.getMargin();                        jb.setBorder(BorderFactory.createEmptyBorder());
                        jb.setMargin(new Insets(3,3,3,3));                        jb.setBorder(border);
                        jb.setMargin(insets);
                        setSize(320,240);
                        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                        setVisible(true);