我正在尝试创建一个程序,该程序将从随机访问文件中获取数据,并根据用户选择的任何复选框对其进行排序。数据应按银行帐号,客户名称或余额进行排序(当用户单击该复选框时,文本区域中的数据将根据该数据进行排序)。数据排序后,输出到JTextArea。我还试图在复选框下方的文本字段中输出文件中的条目总数。
谢谢!
import java.lang.reflect.Array;
import java.nio.file.*;
import java.text.DecimalFormat;
import java.util.Collections;
import java.io.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.*;
import javax.swing.border.Border;
public class GUIBankAcctSorter extends JFrame implements ItemListener {
public static void main(String[] args) {
GUIBankAcctSorter myFrame = new GUIBankAcctSorter();
myFrame.setVisible(true);
Path file = Paths.get("C:\\Java\\Bank.txt");
final String ID_FORMAT = "0000";
final String NAME_FORMAT = " ";
final int NAME_LENGTH = NAME_FORMAT.length();
final String BALANCE_FORMAT = "00000.00";
String delimiter = ",";
String s = ID_FORMAT + delimiter + NAME_LENGTH + delimiter + BALANCE_FORMAT + System.getProperty("line.separator");
final String EMPTY_ACCT = "0000";
String[] array = new String[3];
double balance = 0;
output(s, array, delimiter, balance, EMPTY_ACCT, file);
}
private static final long serialVersionUID = 1L;
private static final int WIDTH = 450;
private static final int HEIGHT = 310;
private static final int X_ORIGIN = 200;
private static final int Y_ORIGIN = 200;
JLabel title = new JLabel("Bank Account Sorter");
JLabel sort = new JLabel("Sort By ");
JLabel total = new JLabel("Total # of Bank Accounts ");
private Container con = getContentPane();
private FlowLayout layout = new FlowLayout();
static JTextArea area = new JTextArea(10, 35);
static JTextField field = new JTextField(5);
JCheckBox cust = new JCheckBox(" Cust # ", false);
JCheckBox bal = new JCheckBox(" Balance ", false);
JCheckBox name = new JCheckBox(" Name ", false);
public static void output(String s, String[] array, String delimiter, double balance, String EMPTY_ACCT, Path file){
String temp = "";
try{
InputStream iStream = new BufferedInputStream(Files.newInputStream(file));
BufferedReader reader = new BufferedReader(new InputStreamReader(iStream));
while(s != null){
array = s.split(delimiter);
if(!array[0].equals(EMPTY_ACCT)){
balance = Double.parseDouble(array[2]);
area.append("Cust # " + array[0] + "\t" + " Name: " + array[1] + " Balance " + "\t$" + array[2] + "\n");
}
s = reader.readLine();
}
reader.close();
}catch(Exception e){
System.out.println("Message: " + e);
}
field.setText(temp);
}
public GUIBankAcctSorter(){
super("Bank Account Sorter");
Font headFont = new Font("Arial", Font.BOLD, 28);
con.setLayout(layout);
title.setFont(headFont);
con.add(title);
area.setEditable(false);
field.setEditable(false);
con.add(new JScrollPane(area));
cust.addItemListener(this);
bal.addItemListener(this);
name.addItemListener(this);
con.add(sort);
con.add(cust);
con.add(bal);
con.add(name);
con.add(total);
con.add(field);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(X_ORIGIN, Y_ORIGIN, WIDTH, HEIGHT);
setResizable(false);
setLocationRelativeTo(null);
}
public void itemStateChanged(ItemEvent e) {
Object source = e.getSource();
int select = e.getStateChange();
if(source == cust){
if(select == ItemEvent.SELECTED){
bal.setSelected(false);
name.setSelected(false);
}
}
if(source == bal){
if(select == ItemEvent.SELECTED){
cust.setSelected(false);
name.setSelected(false);
}
}
if(source == name){
if(select == ItemEvent.SELECTED){
cust.setSelected(false);
bal.setSelected(false);
}
}
}
}
答案 0 :(得分:1)
在这里,您可以看到一个使用比较器对对象进行排序的好例子。
让我们假设: RowTest是一个表示单行网格的类。 orderAMT是Row的类变量/ Column / JTextField。 现在,下面的代码显示了如何根据其属性orderAMT对RowTest列表进行排序。
List<RowTest> sortedList = getAllRowsThatNeedToBeSorted();
Comparator comparator = new OrderAMTComparator();
Collections.sort(sortedList, comparator);
public class OrderAMTComparator implements Comparator<RowTest> {
@Override
public int compare(RowTest o1, RowTest o2) {
//Here you can use If condition to check which checkbox is selected and sort the list
//repace getOrderAMT with other fields.
BigDecimal compareRes = o1.getOrderAMT().getBigdecimalValue().subtract(o2.getOrderAMT().getBigdecimalValue());
//You can just return compareRes.compareTo(new BigDecimal(0))
//But Here I want to show that you can check any condition and return -1,1,0 as your
//requirement
if (compareRes.compareTo(new BigDecimal(0)) == -1) {
return -1;
} else if (compareRes.compareTo(new BigDecimal(0)) == 1) {
return 1;
} else if (compareRes.compareTo(new BigDecimal(0)) == 0 ) {
return 0;
}
return compareRes.intValue();
}
}
我希望你明白这一点。如果没有,我会详细说明。 三江源。
答案 1 :(得分:1)
无论如何都要使用复选框吗?
当然:
Account
类,用于存储帐号,名称和号码。平衡。Account
添加到List
<{1}}结构中,例如ArrayList.
Comparator
。Collections.sort(list,comparator)
。ButtonGroup
JRadioButton
个实例。setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
更改为setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
&amp; setLocationRelativeTo(null)
到setLocationByPlatform(true)
。有关演示,请参阅this answer。setBounds(X_ORIGIN, Y_ORIGIN, WIDTH, HEIGHT);
的{{1}}(并更有效地使用布局)。