Question

请教java中setUI的用法

Answer 1

java中setUI的用法：
语法：public void setUI(ComboBoxUI ui)

举例：

import java.awt.BorderLayout;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.plaf.ComboBoxUI;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.basic.BasicArrowButton;
import javax.swing.plaf.basic.BasicComboBoxUI;

public class Main {

public static void main(final String args[]) {
final String labels[] = { "A", "B", "C", "D", "E" };
JFrame frame = new JFrame("Popup JComboBox");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JComboBox comboBox = new JComboBox(labels);
comboBox.setUI((ComboBoxUI) MyComboBoxUI.createUI(comboBox));
frame.add(comboBox, BorderLayout.NORTH);

frame.setSize(300, 200);
frame.setVisible(true);

}

static class MyComboBoxUI extends BasicComboBoxUI {
public static ComponentUI createUI(JComponent c) {
return new MyComboBoxUI();
}

protected JButton createArrowButton() {
JButton button = new BasicArrowButton(BasicArrowButton.EAST);
return button;
}
}
}

Answer 2

两个类
运行的类UI1

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package com.monubia.ui;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.Random;
public class UI1 extends JFrame {
private JPanel contentPane;
private JButton btnNewButton;
private JButton btnNewButton_1;
private JButton btnNewButton_2;
private JButton btnStart;
public static UI1 uiGet;
/**
* Launch the application.
*/
public static void main(String[] args) {

UI1 frame = new UI1();
frame.setTitle("");
frame.setVisible(true);
uiGet=frame;
}
/**
* Create the frame.
*/
public UI1() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);

btnNewButton = new JButton("New button");
btnNewButton.setBounds(44, 28, 93, 23);
contentPane.add(btnNewButton);

btnNewButton_1 = new JButton("New button");
btnNewButton_1.setBounds(157, 28, 93, 23);
contentPane.add(btnNewButton_1);

btnNewButton_2 = new JButton("New button");
btnNewButton_2.setBounds(274, 28, 93, 23);
contentPane.add(btnNewButton_2);

btnStart = new JButton("Start");
btnStart.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent arg0) {
System.out.println("点击了鼠标");
new ThreadText().ThreadControlText();
}
});
btnStart.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
}
});
btnStart.setBounds(100, 131, 93, 23);
contentPane.add(btnStart);

JButton btnNewButton_3 = new JButton("New button");
btnNewButton_3.setBounds(214, 131, 93, 23);
contentPane.add(btnNewButton_3);
}

public void setButtonText()
{
btnNewButton.setText(new Random().nextInt(100)+1+"");
btnNewButton_1.setText(new Random().nextInt(100)+1+"");
btnNewButton_2.setText(new Random().nextInt(100)+1+"");
}
}

线程类ThreadText

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package com.monubia.ui;
public class ThreadText {

public void ThreadControlText()
{
Thread tct = new Thread()
{
public void run()
{
while(true)
{
UI1.uiGet.setButtonText();
}
}
};
tct.start();
}
}