JTable没有显示任何内容? [英] JTable does not show anything?
问题描述
这是我的整个班级.我从一个文本文件中读取数据，并将其放入aaeaylist.然后从该数组列表中，我想在调用特定方法时在JTable上显示数据.但是不显示任何内容
here is my entire class. I read data from a text file, put them into an aeeaylist. then from that array list i want to show the data on a JTable, when the specific method is called.But is doesnt show anything
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author George
*/
import java.awt.*;
import java.util.ArrayList;
//import java.io.FileInputStream;
//import java.io.FileNotFoundException;
//import java.io.EOFException;
//import java.io.IOException;
//import java.io.ObjectInputStream;
/*import java.io.File;
import java.lang.IllegalStateException;
import java.util.NoSuchElementException;
import java.util.Scanner;
import javax.swing.JOptionPane;*/
import java.io.*;
//import java.util.Locale;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
public class Company extends JFrame {
private ArrayList<Employee> emp=new ArrayList<Employee>();
//Employee[] list=new Employee[7];
public void getEmployees(Employee emplo){
emp.add(emplo);
}
/*public void openTxt(){
try {
Scanner input=new Scanner(new File("Employees.txt"));
}
catch(FileNotFoundException e){
JOptionPane.showMessageDialog(null, "File Not Found.");
System.exit(1);
}
}*/
public void doRead() throws Exception{
//ArrayList<Employee> emp=new ArrayList<Employee>() ;
//Employee[] emp=new Employee[7];
//read from file
File data = new File("src/Employees.txt");
BufferedReader read = new BufferedReader(new FileReader(data));
String input;
int i = 0;
//int salesmen = 0;
while ((input = read.readLine()) != null) {
String [] lineParts = input.split(",");
/**
* the following block converts some of the strings inputted to
* the appropriate vartypes.
*/
String EmpNo=(lineParts[0]);
String type=lineParts[10];
String PostalCode = (lineParts[5]);
int phone = Integer.parseInt(lineParts[6]);
short DeptNo = (short) Integer.parseInt(lineParts[8]);
double Salary;
short card = (short) Integer.parseInt(lineParts[11]);
int dtype=0;
if(type.equals("FULL TIME")){
dtype=1;
}
else if(type.equals("SELLER")){
dtype=2;
}
else
dtype=3;
/**
* Creates employee instances depending on their type of employment
* (fulltime=1, parttime=3, salesman=2)
*/
switch (dtype) {
case 1 :
//empNo,firstname, lastname, address, city, PostalCode, phone,
//email, deptcode,Jobtype, salary, TimecardId, hoursW
Salary = Double.parseDouble(lineParts[10]);
emp.add(new FullTimeEmployee(EmpNo,lineParts[1], lineParts[2], lineParts[3],
lineParts[4], PostalCode, phone,
lineParts[7], DeptNo,type,Salary, card, 0.0));
i++;
break;
case 2 :
Salary = Double.parseDouble(lineParts[10]);
ArrayList<Orders> orders=new ArrayList<Orders>();
Salary = Double.parseDouble(lineParts[10]);
emp.add(new Salesman(EmpNo,lineParts[1], lineParts[2], lineParts[3],
lineParts[4], PostalCode, phone,
lineParts[7], DeptNo,type,Salary, card, 0.0, orders));
i++;
break;
case 3 :
Salary = Double.parseDouble(lineParts[10]);
emp.add(new PartTimeEmployee(EmpNo,lineParts[1], lineParts[2], lineParts[3],
lineParts[4], PostalCode, phone,
lineParts[7], DeptNo,type,Salary, card, 0.0));
i++;
break;
default :
break;
}
}
}
public ArrayList<Employee> getArray(){
return emp;
}
//test methodos gia tin proti epilogi-den deixnei tipota omws sto JTable ????
public /*JTable */ void getOptionA(){
ArrayList<Employee> list=getArray();
/*String[] columnNames = {"Code","First Name","Last Name","Address","Cisty","Postal Code","Phone","Email",
"Dept Code","Salary","Time Card","Hours"};*/
/* Object[][] data;
*/
JTable table = new JTable();
DefaultTableModel model = new DefaultTableModel();
table.setModel(model);
model.setColumnIdentifiers(new String[] {"Code","First Name","Last Name","Address","City","Postal Code","Phone","Email",
"Dept Code","Salary","Time Card","Hours"});
for( Employee current : list){
model.addRow(new Object[] {current.getCode(),current.getName(),current.getSurname(),
current.getAddress(),current.getCity(),current.getTK(),
current.getPhone(),current.getMail(),current.getDeptCode(),
current.getSalary(),current.getCard(),current.getHours()
});
}
/*JScrollPane scrollPane = new JScrollPane(table);
table.setFillsViewportHeight(true);*/
//return table;
table.setPreferredScrollableViewportSize(new Dimension(500,50));
table.setFillsViewportHeight(true);
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane);
}
public void showOptionA(){
getOptionA();
Company gui =new Company();
gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
gui.setVisible(true);
gui.setSize(600, 400);
}
}
我从另一个JFrame类上的JButton调用showOptionA().
I call showOptionA() from a JButton located on another JFrame Class.
private void showEmployeesActionPerformed(java.awt.event.ActionEvent evt) {
Results showEmp=new Results();
//showEmp.setVisible(true);
//showEmp.setOptions(1);
Company company=new Company();
/*JTable table=company.getOptionA();
JScrollPane scrollPane = new JScrollPane(table);
table.setFillsViewportHeight(true);
scrollPane.setViewportView(table);
table.setVisible(true);*/
company.showOptionA();
}
基本上，我有一个带有不同选项的主" JFrame，每个按钮代表一个不同的选项，从Company Class中调用适当的选项方法.
Basically i have a "main"JFrame with different options, and each button,representing a different option, calls the appropriate option method from Company Class.
当我单击显示员工状态"按钮时.我希望它显示上面的JTable.而是打开了一个新框架，但为空白?
When i click on the button "Show Employees Status". i want it to show the JTable above. Instead a new Frame opens but is blank??
如果我将showOptionA()更改为static，然后在showEmployeesActionPerformed内部调用(位于PayrollForm类中)
if i change showOptionA() to static, and then just call it inside showEmployeesActionPerformed , ( which is located in class PayrollForm)
public static void showOptionA(){
Company gui =new Company();
gui.getOptionA();
gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
gui.setVisible(true);
gui.setSize(600, 400);
}
我现在看到列但没有数据(空)
i now see the columns but with no data(empty)
推荐答案
这与另一个建议的调用revalidate无关，并且可能与在错误的对象上调用方法有关.在showEmployeesActionPerformed方法中，创建一个新的Company对象，该对象不可见.关键是在可视化的GUI上的正确引用上调用此方法.您可以通过将对可视化GUI对象的引用传递到要在其上调用方法的类中来实现.这可以通过setCompany方法完成:
This has nothing to do with calling revalidate as recommended by another and likely has all to do with calling a method on the wrong object. In your showEmployeesActionPerformed method you create a new Company object, one that is not visualized. The key is to call this method on the proper reference, on the visualized GUI. You do this by passing a reference to the visualized GUI object into the class that is wanting to call methods on it. This can be done via a setCompany method:
setCompany(Company company) {
this.company = company);
}
或通过构造函数参数.
这篇关于JTable没有显示任何内容?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
