主要摘抄至corejava2 、 现文本框中输入一词点击Add按钮把它添加到一个单词列表中。
package com.corejava.collection;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.Collator;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Locale;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
/**
* This program demonstrates collating strings under various locales.
*
* @author root 2014-12-09
*/
public class CollectionTest {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
JFrame frame = new CollectionFrame();
frame.setTitle("CollectionTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
/*
* This frame contains combo boxes to pick a locale,collection strength and
* decomposition rules. a text field and button to add new strings,and a text
* area to list the collated strings.
*/
class CollectionFrame extends JFrame {
/**
* 序列化
*/
private static final long serialVersionUID = 1L;
private Collator collator = Collator.getInstance(Locale.getDefault());
private List<String> strings = new ArrayList<>();
private Collator currentCollator;
private Locale[] locales;
private JComboBox<String> localeCombo = new JComboBox<>();
private JTextField newWord = new JTextField(20);
private JTextArea sortedWords = new JTextArea(20, 20);
private JButton addButton = new JButton("add");
private EnumCombo strengthCombo = new EnumCombo(Collator.class, "Primary",
"Secondary", "Tertiary", "Identical");
private EnumCombo decompositionCombo = new EnumCombo(Collator.class,
"Canonical Decomposition", "Full Decomposition", "No Decomposition");
public CollectionFrame() {
// TODO Auto-generated constructor stub
setLayout(new GridBagLayout());
add(new JLabel("Local"), new GBC(0, 0).setAnchor(GBC.EAST));
add(new JLabel("Stringth"), new GBC(0, 1).setAnchor(GBC.EAST));
add(new JLabel("Decomposition"), new GBC(0, 2).setAnchor(GBC.EAST));
add(addButton, new GBC(0, 3).setAnchor(GBC.EAST));
add(localeCombo, new GBC(1, 0).setAnchor(GBC.WEST));
add(decompositionCombo, new GBC(1, 1).setAnchor(GBC.WEST));
add(newWord, new GBC(1, 3).setFill(GBC.HORIZONTAL));
add(new JScrollPane(sortedWords), new GBC(0, 4, 2, 1).setFill(GBC.BOTH));
locales = (Locale[]) Collator.getAvailableLocales().clone();
Arrays.sort(locales, new Comparator<Locale>() {
@Override
public int compare(Locale o1, Locale o2) {
// TODO Auto-generated method stub
return collator.compare(o1.getDisplayName(),
o2.getDisplayName());
}
});
for (Locale loc : locales)
localeCombo.addItem(loc.getDisplayName());
localeCombo.setSelectedItem(Locale.getDefault().getDisplayName());
strings.add("America");
strings.add("able");
strings.add("Zulu");
strings.add("zebra");
strings.add("\u00C5ngstr\u00F6m");
strings.add("A\u030angstro\u0308m");
strings.add("Angstrom");
strings.add("Able");
strings.add("office");
strings.add("o\uFB03ce");
strings.add("Java\u2122");
strings.add("JavaTM");
addButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
strings.add(newWord.getText());
updateDisplay();
}
});
ActionListener listener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
updateDisplay();
}
};
localeCombo.addActionListener(listener);
strengthCombo.addActionListener(listener);
decompositionCombo.addActionListener(listener);
pack();
}
/*
* Updates the display and collates the strings according to the user
* setting.
*/
public void updateDisplay() {
Locale currentLocale = locales[localeCombo.getSelectedIndex()];
localeCombo.setLocale(currentLocale);
currentCollator = Collator.getInstance(currentLocale);
currentCollator.setStrength(strengthCombo.getValue());
currentCollator.setDecomposition(decompositionCombo.getValue());
Collections.sort(strings, currentCollator);
sortedWords.setText("");
for (int i = 0; i < strings.size(); i++) {
String s = strings.get(i);
if (i > 0 && currentCollator.compare(s, strings.get(i - 1)) == 0)
sortedWords.append("= ");
sortedWords.append(s + "\n");
}
// 调整此窗口的大小，以适合其子组件的首选大小和布局
pack();
}
}
package com.corejava.collection;
import java.util.*;
import javax.swing.*;
/**
* A combo box that lets users choose from among static field values whose names
* are given in the constructor.
*
* @author root 2014-12-09
*/
public class EnumCombo extends JComboBox<String> {
/**
*
*/
private static final long serialVersionUID = 1L;
private Map<String, Integer> table = new TreeMap<>();
/**
* Constructs an EnumCombo.
*
* @param cl
* a class
* @param labels
* an array of static field names of cl
*/
public EnumCombo(Class<?> cl, String... labels) {
for (String label : labels) {
String name = label.toUpperCase().replace(' ', '_');
int value = 0;
try {
java.lang.reflect.Field f = cl.getField(name);
value = f.getInt(cl);
} catch (Exception e) {
label = "(" + label + ")";
}
table.put(label, value);
addItem(label);
}
setSelectedItem(labels[0]);
}
/**
* Returns the value of the field that the user selected.
*
* @return the static field value
*/
public int getValue() {
return table.get(getSelectedItem());
}
}
package com.corejava.collection;
import java.awt.*;
/**
* This class simplifies the use of the GridBagConstraints class.
*/
public class GBC extends GridBagConstraints {
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* Constructs a GBC with a given gridx and gridy position and all other grid
* bag constraint values set to the default.
*
* @param gridx
* the gridx position
* @param gridy
* the gridy position
*/
public GBC(int gridx, int gridy) {
this.gridx = gridx;
this.gridy = gridy;
}
/**
* Constructs a GBC with given gridx, gridy, gridwidth, gridheight and all
* other grid bag constraint values set to the default.
*
* @param gridx
* the gridx position
* @param gridy
* the gridy position
* @param gridwidth
* the cell span in x-direction
* @param gridheight
* the cell span in y-direction
*/
public GBC(int gridx, int gridy, int gridwidth, int gridheight) {
this.gridx = gridx;
this.gridy = gridy;
this.gridwidth = gridwidth;
this.gridheight = gridheight;
}
/**
* Sets the anchor.
*
* @param anchor
* the anchor value
* @return this object for further modification
*/
public GBC setAnchor(int anchor) {
this.anchor = anchor;
return this;
}
/**
* Sets the fill direction.
*
* @param fill
* the fill direction
* @return this object for further modification
*/
public GBC setFill(int fill) {
this.fill = fill;
return this;
}
/**
* Sets the cell weights.
*
* @param weightx
* the cell weight in x-direction
* @param weighty
* the cell weight in y-direction
* @return this object for further modification
*/
public GBC setWeight(double weightx, double weighty) {
this.weightx = weightx;
this.weighty = weighty;
return this;
}
/**
* Sets the insets of this cell.
*
* @param distance
* the spacing to use in all directions
* @return this object for further modification
*/
public GBC setInsets(int distance) {
this.insets = new Insets(distance, distance, distance, distance);
return this;
}
/**
* Sets the insets of this cell.
*
* @param top
* the spacing to use on top
* @param left
* the spacing to use to the left
* @param bottom
* the spacing to use on the bottom
* @param right
* the spacing to use to the right
* @return this object for further modification
*/
public GBC setInsets(int top, int left, int bottom, int right) {
this.insets = new Insets(top, left, bottom, right);
return this;
}
/**
* Sets the internal padding
*
* @param ipadx
* the internal padding in x-direction
* @param ipady
* the internal padding in y-direction
* @return this object for further modification
*/
public GBC setIpad(int ipadx, int ipady) {
this.ipadx = ipadx;
this.ipady = ipady;
return this;
}
}
实验结果如下图：
