本文介绍了Java Swing GUI似乎没有的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图通过手写而不是使用表单生成器来制作基于BorderLayout和GridLayout的GUI.因此，我很可能会跳过代码中的一部分.它已加载，但似乎没有.
I'm trying to make a GUI based on BorderLayout and GridLayout by hand-writing not with a form builder. Because of that, I'm most likely skipping a part in the code. It is loaded but not seem.
import java.awt.*;
import java.awt.event.*;
import java.io.IOException;
import java.net.InetAddress;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
class PanelDemo {
JButton jbtnUpArrowFirst;
JButton jbtnDownArrowFirst;
JButton jbtnUpArrowSec;
JButton jbtnDownArrowSec;
JButton jbtnUpArrowThird;
JButton jbtnDownArrowThird;
JLabel jlblLedUpFirst;
JLabel jlblLedDownFirst;
JLabel jlblLedUpSec;
JLabel jlblLedDownSec;
JLabel jlblLedUpThird;
JLabel jlblLedDownThird;
private JComponent ui = null;
private Insets buttonMargin = new Insets(10,10,10,10);
PanelDemo() throws IOException {
InitComponents();
}
private void InitComponents() {
if (ui != null) return;
ui = new JPanel(new BorderLayout(4,4));
ui.setBorder(new EmptyBorder(4,4,4,4));
int gap = 5;
JPanel jpnl = new JPanel(new GridLayout(2, 4, gap, gap));
jpnl.setBorder(new EmptyBorder(0, 0, 0, 50));
jpnl.setOpaque(true);
jpnl.setBorder(
BorderFactory.createLineBorder(Color.BLUE));
JPanel jpnl2 = new JPanel(new GridLayout(2, 2, gap, gap));
jpnl2.setOpaque(true);
jpnl2.setBorder(
BorderFactory.createLineBorder(Color.RED));
jbtnUpArrowFirst = new JButton("upfirst" ,new ImageIcon("/Users/Jack/Desktop/up.png"));
jbtnUpArrowFirst.setVerticalTextPosition(SwingConstants.BOTTOM);
jbtnUpArrowFirst.setHorizontalTextPosition(SwingConstants.CENTER);
jbtnDownArrowFirst = new JButton("downfirst" ,new ImageIcon("/Users/Jack/Desktop/down.png"));
jbtnDownArrowFirst.setVerticalTextPosition(SwingConstants.BOTTOM);
jbtnDownArrowFirst.setHorizontalTextPosition(SwingConstants.CENTER);
jlblLedUpFirst = new JLabel("upledfirst", new ImageIcon("/Users/Jack/Desktop/ledOff.png"), SwingConstants.CENTER);
jlblLedUpFirst.setVerticalTextPosition(SwingConstants.BOTTOM);
jlblLedUpFirst.setHorizontalTextPosition(SwingConstants.CENTER);
jlblLedDownFirst = new JLabel("downledfirst", new ImageIcon("/Users/Jack/Desktop/ledOff.png"), SwingConstants.CENTER);
jlblLedDownFirst.setVerticalTextPosition(SwingConstants.BOTTOM);
jlblLedDownFirst.setHorizontalTextPosition(SwingConstants.CENTER);
////////////////////////////////////////////////////////////////////////
jbtnUpArrowSec = new JButton("upsec", new ImageIcon("/Users/Jack/Desktop/up.png"));
jbtnUpArrowSec.setVerticalTextPosition(SwingConstants.BOTTOM);
jbtnUpArrowSec.setHorizontalTextPosition(SwingConstants.CENTER);
jbtnDownArrowSec = new JButton("downsec" ,new ImageIcon("/Users/Jack/Desktop/down.png"));
jbtnDownArrowSec.setVerticalTextPosition(SwingConstants.BOTTOM);
jbtnDownArrowSec.setHorizontalTextPosition(SwingConstants.CENTER);
jlblLedUpSec = new JLabel("upledsecond", new ImageIcon("/Users/Jack/Desktop/ledOff.png"), SwingConstants.CENTER);
jlblLedUpSec.setVerticalTextPosition(SwingConstants.BOTTOM);
jlblLedUpSec.setHorizontalTextPosition(SwingConstants.CENTER);
jlblLedDownSec = new JLabel("downledsec", new ImageIcon("/Users/Jack/Desktop/ledOff.png"), SwingConstants.CENTER);
jlblLedDownSec.setVerticalTextPosition(SwingConstants.BOTTOM);
jlblLedDownSec.setHorizontalTextPosition(SwingConstants.CENTER);
////////////////////////////////////////////////////////////////////////
jbtnUpArrowThird = new JButton("upthirt", new ImageIcon("/Users/Jack/Desktop/up.png"));
jbtnUpArrowThird.setVerticalTextPosition(SwingConstants.BOTTOM);
jbtnUpArrowThird.setHorizontalTextPosition(SwingConstants.CENTER);
jbtnDownArrowThird = new JButton("downthird" ,new ImageIcon("/Users/Jack/Desktop/down.png"));
jbtnDownArrowThird.setVerticalTextPosition(SwingConstants.BOTTOM);
jbtnDownArrowThird.setHorizontalTextPosition(SwingConstants.CENTER);
jlblLedUpThird = new JLabel("upledthird", new ImageIcon("/Users/Jack/Desktop/ledOff.png"), SwingConstants.CENTER);
jlblLedUpThird.setVerticalTextPosition(SwingConstants.BOTTOM);
jlblLedUpThird.setHorizontalTextPosition(SwingConstants.CENTER);
jlblLedDownThird = new JLabel("downledthird", new ImageIcon("/Users/Jack/Desktop/ledOff.png"), SwingConstants.CENTER);
jlblLedDownThird.setVerticalTextPosition(SwingConstants.BOTTOM);
jlblLedDownThird.setHorizontalTextPosition(SwingConstants.CENTER);
// Add the buttons and label to the panel.
jpnl.add(jbtnUpArrowFirst);
jpnl.add(jlblLedUpFirst);
jpnl.add(jbtnUpArrowSec);
jpnl.add(jlblLedUpSec);
jpnl.add(jbtnDownArrowFirst);
jpnl.add(jlblLedDownFirst);
jpnl.add(jbtnDownArrowSec);
jpnl.add(jlblLedDownSec);
jpnl2.add(jbtnUpArrowThird);
jpnl2.add(jlblLedUpThird);
jpnl2.add(jbtnDownArrowThird);
jpnl2.add(jlblLedDownThird);
ui.add(jpnl, BorderLayout.CENTER);
ui.add(jpnl2, BorderLayout.LINE_END);
JFrame jfrm = new JFrame("Use Two JPanels");
jfrm.setLocationByPlatform(true);
jfrm.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
jfrm.setContentPane(getUI());
jfrm.setMinimumSize(jfrm.getSize());
jfrm.pack();
jfrm.setVisible(true);
/*jbtnUpArrowFirst.addActionListener(e -> {
try {
test.send("ANTSW=VERT\r\n");
//if (test.recv().equalsIgnoreCase(""))
} catch (IOException e1) {
e1.printStackTrace();
}
});
jbtnDownArrowFirst.addActionListener(e -> {
try {
test.send("ANTSW=HORZ\r\n");
} catch (IOException e1) {
e1.printStackTrace();
}
});*/
}
public JComponent getUI() {
return ui;
}
public static void main(String args[]) {
// Create the frame on the event dispatching thread.
SwingUtilities.invokeLater(() -> {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
new PanelDemo();
} catch (IOException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (UnsupportedLookAndFeelException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
});
}
}
推荐答案
在将所有组件添加到JFrame之前，您要调用pack()和setVisible().将执行此操作的块移到构造函数的末尾.
You are calling pack() and setVisible() before you add all the components to the JFrame. Move the block that does that to the end of the constructor.
此外，我的编译器无法在设置动作侦听器的代码中的任何地方找到test.我还没有使用Java 8，所以我不知道那里出了什么问题，但是Eclipse应该能够在没有错误的情况下进行编译.
In addition, my compiler cannot find test anywhere in the code that is setting up action listeners. I haven't worked with Java 8, so I don't know what's wrong there, but Eclipse should be able to compile this without errors.
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