java 设置大小在java中不起作用
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set size wont work in java
提问by amana
public void start_Gui() {
JFrame window = new JFrame("Client Program");
window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
window.setContentPane(panel);
panel.setLayout(new GridLayout(1,2));
JLabel leftside = new JLabel();
leftside.setLayout(new GridLayout(2, 1));
JTextArea rightside = new JTextArea();
rightside.setEditable(false); //add scroll pane.
rightside.setBorder(BorderFactory.createLineBorder(Color.BLACK));
rightside.setLayout(new FlowLayout());
JTextArea client_text_input = new JTextArea();
client_text_input.setBorder(BorderFactory.createLineBorder(Color.BLACK));
leftside.add(client_text_input);
JLabel buttons_layer = new JLabel();
JButton login = new JButton("Login");
JButton logout = new JButton("Logout");
buttons_layer.setBorder(BorderFactory.createLineBorder(Color.BLACK));
buttons_layer.setLayout(new GridLayout(2, 1));
buttons_layer.add(login);
buttons_layer.add(logout);
leftside.add(buttons_layer);
panel.add(leftside);
panel.add(rightside);
window.setSize(300, 400);
window.setResizable(false);
window.setVisible(true);
}
I am working on a simple java chat client gui application. (the server etc, is done by others).
我正在开发一个简单的 java 聊天客户端 gui 应用程序。（服务器等，由其他人完成）。
It is not a big project, but my only problem is that whatever I do to try to resize any components on the above GUI, won't work.
这不是一个大项目，但我唯一的问题是，无论我尝试调整上述 GUI 上任何组件的大小，都将不起作用。
For example:
例如：
JTextArea client_text_input = new JTextArea();
client_text_input.setSize(100,200);
Won't work.
不会工作。
Thanks for the help.
谢谢您的帮助。
回答by Joachim Sauer
In Swing, you have two options for layout: do everything manually or let a LayoutManagerhandle it for you.
在 Swing 中，您有两种布局选项：手动完成所有操作或让LayoutManager您处理。
Calling setSize()will only work when you're not using a LayoutManager. Since you're using a GridLayoutyou'll have to use other ways to specify what you want.
调用setSize()，当你不使用才有效LayoutManager。由于您使用的是 a ，因此GridLayout您必须使用其他方式来指定您想要的内容。
Try calling setPreferredSize()and setMinimumSize().
回答by Bastardo
Two things - firstly you should be setting the preferredSize of the scrollpane, but secondly, trying to resize it inside the componentResized handler isn't a very effective technique because the 'resized' events aren't continuous.
两件事 - 首先，您应该设置滚动窗格的 preferredSize，但其次，尝试在 componentResized 处理程序中调整它的大小并不是一种非常有效的技术，因为 'resized' 事件不是连续的。
回答by mKorbel
but setXxxSize(for ContainersChilds) works as chaims if you change from setSize()(for TopLayoutContainer) to setPreferredSize()and you have to call pack()before setVisible()
但是setXxxSize（对于ContainersChilds）如果你从setSize()（对于TopLayoutContainer）更改为setPreferredSize()并且你必须在pack()之前调用setVisible()
