Question

如何在Jpanel中调整Jbutton的大小

我按照这样的方法，大小还是没有改变

JButton add = new JButton("增加数据");

//add.setBoun
JButton delete = new JButton("删除数据");
JButton exite = new JButton("退出系统");
add.setPreferredSize(new java.awt.Dimension(20,20));
delete.setPreferredSize(new java.awt.Dimension(20,20));
exite.setPreferredSize(new java.awt.Dimension(20,20));

JPanel p = new JPanel();
p.setLayout(new GridLayout(1,3,100,0));
p.add(add);
p.add(delete);
p.add(exite);

Answer 1

用了LAYOUT就不能调整大小了
可以这样

JPanel p = new JPanel();
p.setLayout(new GridLayout(1,3,100,0));
JPanel p1 = new JPanel();
p1.setLayout(null);
p1.add(add);
p.add(p1);

JPanel p2 = new JPanel();
p2.setLayout(null);
p2.add(delete);
p.add(p2);

JPanel p3 = new JPanel();
p3.setLayout(null);
p3.add(exite);
p.add(p3 );

Answer 2

把最大大小也设置了试试