java基础知识13-javaUI2 - JAVA

java的Swing库采用Beans的方式允许我们更加方便的创建界面。

1：进度条

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
public class Progress extends JPanel {
	JProgressBar pb = new JProgressBar();			//进度条
	JSlider sb = new JSlider(JSlider.HORIZONTAL, 0, 100, 60);//滑动条
	public Progress() {
		setLayout(new GridLayout(2,1));
		add(pb);
		sb.setValue(0);
		sb.setPaintTicks(true);
		sb.setMajorTickSpacing(20); //设置滑动条的主间隔个数
		sb.setMinorTickSpacing(5);  //每个间隔细分为5个间隔
		sb.setBorder(new TitledBorder("Slide Me"));
		pb.setModel(sb.getModel()); // Share model
		add(sb);
	}
	public static void main(String args[]) {
		JFrame jf = new JFrame();
		Progress pro = new Progress();
		jf.add(pro);
		jf.setSize(200,300);
		jf.setVisible(true);
	}
} ///:~

结果如下所示：

2：ButtonGroup以及动态映射

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import java.lang.reflect.*;
public class ButtonGroups extends JPanel {
	static String[] ids = { 
		"June", "Ward", "Beaver","Wally", "Eddie", "Lumpy",
	};
	static JPanel makeBPanel(Class bClass, String[] ids) {
		ButtonGroup bg = new ButtonGroup();
		JPanel jp = new JPanel();
		String title = bClass.getName();
		title = title.substring( title.lastIndexOf('.') + 1);
		jp.setBorder(new TitledBorder(title));
		for(int i = 0; i < ids.length; i++) {
			AbstractButton ab = new JButton("failed");
			try {
				//动态获得一个有一个String参数的构造函数
				Constructor ctor = bClass.getConstructor(new Class[] { String.class });
				//创造一个Object
				ab = (AbstractButton)ctor.newInstance(new Object[]{ids[i]});
			} catch(Exception ex) {
				System.out.println("can't create " + bClass);
			}
			bg.add(ab);//按钮组添加按钮
			jp.add(ab);
		}
		return jp;
	}
	public ButtonGroups() {
		add(makeBPanel(JButton.class, ids));
		add(makeBPanel(JToggleButton.class, ids));
		add(makeBPanel(JCheckBox.class, ids));
		add(makeBPanel(JRadioButton.class, ids));
	}
	public static void main(String args[]) {
		JFrame jf = new JFrame();
		ButtonGroups btg = new ButtonGroups();
		jf.add(btg);
		jf.setSize(500,300);
		jf.setVisible(true);
	}
} ///:~

结果如下所示：

这个程序的特点就是通过reflect来实现添加不同类型的按钮组，AbstractButton 是所有不同类型的button的父类，所以可以通过它来操作子类的重定义函数。通过Constructor ctor = bClass.getConstructor(new Class[] { String.class });来获得有一个参数是String类型的构造函数，通过ab = (AbstractButton)ctor.newInstance(new Object[]{ids[i]});来创建一个button的对象。
ButtonGroup的作用就是一个button组中有一个被选中其他button就处于落选状态。

3：按钮图标

static Icon face = new Icon（"face0.jpg"）;//建立图标
JButton jb = new JButton（"bt",face）;	   //建立带有图标的按钮
jb.setIcon(face);//设置图标
jb.setRolloverIcon(faces[1]);//设置滚动时的按钮图标
jb.setPressedIcon(faces[2]); //设置按下时的按钮图标
jb.setDisabledIcon(faces[4]);//设置禁用时的按钮图标

结果如下所示：

4:弹出菜单
弹出菜单也很简单，包括菜单的创建，菜单命令的响应，如下所示：

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Popup extends JPanel {
	JPopupMenu popup = new JPopupMenu();
	JTextField t = new JTextField(10);
	public Popup() {
		add(t);
		ActionListener al = new ActionListener() {
			public void actionPerformed(ActionEvent e){
				t.setText( ((JMenuItem)e.getSource()).getText());
			}
		};
		JMenuItem m = new JMenuItem("Hither");
		m.addActionListener(al);
		popup.add(m);
		
		m = new JMenuItem("Yon");
		m.addActionListener(al);
		popup.add(m);
		
		m = new JMenuItem("Afar");
		m.addActionListener(al);
		popup.add(m);
		popup.addSeparator();
		
		m = new JMenuItem("Stay Here");
		m.addActionListener(al);
		popup.add(m);
		
		PopupListener pl= new PopupListener();
		addMouseListener(pl);
		t.addMouseListener(pl);//这样即便鼠标点击label，也会弹出菜单
	}
	class PopupListener extends MouseAdapter {
		
		public void mousePressed(MouseEvent e) {
			maybeShowPopup(e);
		}
		
		public void mouseReleased(MouseEvent e) {
			maybeShowPopup(e);
		}
		
		private void maybeShowPopup(MouseEvent e) {
			//判断鼠标事件是否为弹出菜单的触发事件
			if(e.isPopupTrigger()) {
				popup.show(e.getComponent(), e.getX(), e.getY());
			}
		}
	}
	public static void main(String args[])

java基础知识13-javaUI2(一)