Java 在jtable中计算,总计为%
我的项目快结束了,在解决它时遇到了一些问题。我是一名厨师,希望自己的应用程序与自己的业务相关 我的表单称为Recipes,使用了数量单价% 比如说,你有1公斤苹果,5欧元。在清洁结束时,你只有800克苹果。所以我多付了20% 例子Java 在jtable中计算,总计为%,java,swing,jtable,percentage,defaulttablemodel,Java,Swing,Jtable,Percentage,Defaulttablemodel,我的项目快结束了,在解决它时遇到了一些问题。我是一名厨师,希望自己的应用程序与自己的业务相关 我的表单称为Recipes,使用了数量单价% 比如说,你有1公斤苹果,5欧元。在清洁结束时,你只有800克苹果。所以我多付了20% 例子 项目始终为100% 数量5 单价5 使用百分比100%总计=25 数量5,单价5,使用百分比70%,总计=32.5(必须增加30%) 最后,我必须计算食品成本 所以“总成本/售价*100” 我被这个密码困住了。请有人能帮助我进一步与我的项目。 我一周前才认识jav
- 项目始终为100%
- 数量5
- 单价5
- 使用百分比100%总计=25
public class Recipe extends javax.swing.JFrame {
double Qty;
double UnitPrice;
double Used;
double total;
double subTotal;
private static Connection connection = null;
private JPanel contentPane;
Connection conn=null;
如图所示,您可以在getValueAt()的实现中计算派生值。在下面的例子中
COLUMN\u PERCENT
是表中每行工资与sum()
工资的比率
- 百分比列还获取
PercentFormatter
的实例,以将派生值格式化为百分比
导入java.awt.BorderLayout;
导入java.awt.Component;
导入java.awt.Dimension;
导入java.awt.EventQueue;
导入java.text.NumberFormat;
导入java.util.ArrayList;
导入java.util.List;
导入javax.swing.DefaultRowSorter;
导入javax.swing.JFrame;
导入javax.swing.JLabel;
导入javax.swing.JScrollPane;
导入javax.swing.JTable;
导入javax.swing.table.AbstractTableModel;
导入javax.swing.table.DefaultTableCellRenderer;
导入javax.swing.table.TableModel;
/**
*@见https://stackoverflow.com/posts/38192710/edit
*@见https://stackoverflow.com/a/37913520/230513
*@见https://stackoverflow.com/a/37892395/230513
*/
公共类JTablePercentTotalExample{
公共静态void main(字符串[]args){
invokeLater(JTablePercentTotalExample::display);
}
公共静态无效显示(){
JFrame f=新的JFrame(“JTable排序示例”);
f、 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
List listEmployees=createListEmployees();
TableModel model=新员工TableModel(列出员工);
JTable表格=新JTable(型号){
@凌驾
公共维度getPreferredScrollableViewportSize(){
返回新维度(500,getRowCount()*getRowHeight());
}
};
table.getColumnModel().getColumn(3).setCellRenderer(新的CurrencyFormatter());
table.getColumnModel().getColumn(4).setCellRenderer(新的PercentFormatter());
表.setAutoCreateRowSorter(真);
DefaultRowSorter-sorter=(DefaultRowSorter)table.getRowSorter();
分拣机。可设置分拣(4,错误);
f、 添加(新的JScrollPane(表),BorderLayout.CENTER);
f、 包装();
f、 setLocationRelativeTo(空);
f、 setVisible(真);
}
私有静态列表createListEmployees(){
List listEmployees=new ArrayList();
添加(新员工(“彼得”,“经理”,40000));
添加(新员工(“保罗”,“程序员”,25000));
添加(新员工(“玛丽”,“设计师”,25000));
添加(新员工(“唐纳德”,“领导者”,30000));
添加(新员工(“汤姆”,“设计师”,28000));
添加(新员工(“Samantha”,“分析师”,50000));
添加(新员工(“Jerome”,“程序员”,32000));
添加(新员工(“乔纳森”,“开发者”,29000));
添加(新员工(“凯文”,“程序员”,23000));
添加(新员工(“安东尼”,“程序员”,23000));
添加(新员工(“约翰”,“设计师”,33000));
添加(新员工(“David”,“Developer”,28000));
添加(新员工(“哈里”,“设计师”,31000));
添加(新员工(“查尔斯”,“程序员”,26000));
添加(新员工(“约瑟夫”,“经理”,40000));
返回员工;
}
私有静态类EmployeeTableModel扩展了AbstractTableModel{
私有静态final int COLUMN_NUM=0;
私有静态final int COLUMN_NAME=1;
私有静态final int COLUMN_JOB=2;
私有静态最终整数列_工资=3;
私有静态最终整数列_百分比=4;
私有最终字符串[]columnNames={“否”、“名称”、“职务”、“工资”、“百分比”};
私人最终员工名单;
公共雇员表格模型(列出雇员){
this.listEmployees=listEmployees;
int indexCount=1;
适用于(员工:列表员工){
setIndex(indexCount++);
}
}
@凌驾
public int getColumnCount(){
返回columnNames.length;
}
@凌驾
public int getRowCount(){
return listEmployees.size();
}
@凌驾
公共字符串getColumnName(int columnIndex){
返回columnNames[columnIndex];
}
@凌驾
公共类getColumnClass(int columnIndex){
返回getValueAt(0,columnIndex).getClass();
}
@凌驾
公共对象getValueAt(int行索引、int列索引){
Employee=listEmployees.get(rowIndex);
开关(列索引){
案例栏编号:
return employee.getIndex();
案例列名称:
返回employee.getName();
案例栏作业:
return employee.getJob();
案例栏(工资):
JButton btnNewButtonAdd = new JButton("Add");
// btnNewButtonAdd.setIcon(new // ??
btnNewButtonAdd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int i=100;
Qty=Double.parseDouble(textFieldQty.getText());
UnitPrice=Double.parseDouble(txtUnitPrice.getText());
Used=Double.parseDouble(textFieldUsed.getText());
//Used=subTotal/100;
subTotal=Qty*UnitPrice;
//total=subTotal*Used;
//Used=subTotal/100;
total=subTotal*(Used/100);//(100+Used);
String TotalRow= String.format("%.2f", total);
txtTotal.setText(TotalRow);
DefaultTableModel model=(DefaultTableModel) table.getModel();
model.addRow(new Object[]{textFieldQty.getText(), BoxCategory.getSelectedItem(),
BoxDescription.getSelectedItem(), textFieldItemID.getText(),
txtUnitPrice.getText(), BoxUnit.getSelectedItem(), textFieldUsed.getText(),
txtTotal.getText()});
}
}
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.List;
import javax.swing.DefaultRowSorter;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableModel;
/**
* @see https://stackoverflow.com/posts/38192710/edit
* @see https://stackoverflow.com/a/37913520/230513
* @see https://stackoverflow.com/a/37892395/230513
*/
public class JTablePercentTotalExample {
public static void main(String[] args) {
EventQueue.invokeLater(JTablePercentTotalExample::display);
}
public static void display() {
JFrame f = new JFrame("JTable Sorting Example");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
List<Employee> listEmployees = createListEmployees();
TableModel model = new EmployeeTableModel(listEmployees);
JTable table = new JTable(model) {
@Override
public Dimension getPreferredScrollableViewportSize() {
return new Dimension(500, getRowCount() * getRowHeight());
}
};
table.getColumnModel().getColumn(3).setCellRenderer(new CurrencyFormatter());
table.getColumnModel().getColumn(4).setCellRenderer(new PercentFormatter());
table.setAutoCreateRowSorter(true);
DefaultRowSorter sorter = (DefaultRowSorter) table.getRowSorter();
sorter.setSortable(4, false);
f.add(new JScrollPane(table), BorderLayout.CENTER);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
private static List<Employee> createListEmployees() {
List<Employee> listEmployees = new ArrayList<>();
listEmployees.add(new Employee("Peter", "Manager", 40000));
listEmployees.add(new Employee("Paul", "Programmer", 25000));
listEmployees.add(new Employee("Mary", "Designer", 25000));
listEmployees.add(new Employee("Donald", "Leader", 30000));
listEmployees.add(new Employee("Tom", "Designer", 28000));
listEmployees.add(new Employee("Samantha", "Analyst", 50000));
listEmployees.add(new Employee("Jerome", "Programmer", 32000));
listEmployees.add(new Employee("Jonathon", "Developer", 29000));
listEmployees.add(new Employee("Kevin", "Programmer", 23000));
listEmployees.add(new Employee("Anthony", "Programmer", 23000));
listEmployees.add(new Employee("John", "Designer", 33000));
listEmployees.add(new Employee("David", "Developer", 28000));
listEmployees.add(new Employee("Harry", "Designer", 31000));
listEmployees.add(new Employee("Charles", "Programmer", 26000));
listEmployees.add(new Employee("Joseph", "Manager", 40000));
return listEmployees;
}
private static class EmployeeTableModel extends AbstractTableModel {
private static final int COLUMN_NUM = 0;
private static final int COLUMN_NAME = 1;
private static final int COLUMN_JOB = 2;
private static final int COLUMN_SALARY = 3;
private static final int COLUMN_PERCENT = 4;
private final String[] columnNames = {"No", "Name", "Job", "Salary", "Percent"};
private final List<Employee> listEmployees;
public EmployeeTableModel(List<Employee> listEmployees) {
this.listEmployees = listEmployees;
int indexCount = 1;
for (Employee employee : listEmployees) {
employee.setIndex(indexCount++);
}
}
@Override
public int getColumnCount() {
return columnNames.length;
}
@Override
public int getRowCount() {
return listEmployees.size();
}
@Override
public String getColumnName(int columnIndex) {
return columnNames[columnIndex];
}
@Override
public Class<?> getColumnClass(int columnIndex) {
return getValueAt(0, columnIndex).getClass();
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
Employee employee = listEmployees.get(rowIndex);
switch (columnIndex) {
case COLUMN_NUM:
return employee.getIndex();
case COLUMN_NAME:
return employee.getName();
case COLUMN_JOB:
return employee.getJob();
case COLUMN_SALARY:
return employee.getSalary();
case COLUMN_PERCENT:
int salary = (int) getValueAt(rowIndex, COLUMN_SALARY);
return Double.valueOf(salary / (double) sum());
default:
throw new IllegalArgumentException("Invalid column index");
}
}
private int sum() {
int sum = 0;
for (int r = 0; r < getRowCount(); r++) {
sum += (int) getValueAt(r, COLUMN_SALARY);
}
return sum;
}
}
private static class Employee {
private int index;
private String name;
private String job;
private int salary;
public Employee(String name, String job, int salary) {
this.name = name;
this.job = job;
this.salary = salary;
}
public int getIndex() {
return index;
}
public void setIndex(int index) {
this.index = index;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getJob() {
return job;
}
public void setJob(String job) {
this.job = job;
}
public int getSalary() {
return salary;
}
public void setSalary(int age) {
this.salary = age;
}
}
private static class CurrencyFormatter extends DefaultTableCellRenderer {
private final NumberFormat nf = NumberFormat.getCurrencyInstance();
@Override
public Component getTableCellRendererComponent(JTable jTable, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
Component c = super.getTableCellRendererComponent(jTable, value,
isSelected, hasFocus, row, column);
if (c instanceof JLabel && value instanceof Number) {
JLabel label = (JLabel) c;
label.setHorizontalAlignment(JLabel.RIGHT);
Number num = (Number) value;
String text = nf.format(num);
label.setText(text);
}
return c;
}
}
private static class PercentFormatter extends DefaultTableCellRenderer {
private NumberFormat nf = NumberFormat.getPercentInstance();
@Override
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
Component c = super.getTableCellRendererComponent(table, value,
isSelected, hasFocus, row, column);
if (c instanceof JLabel && value instanceof Number) {
JLabel label = (JLabel) c;
label.setHorizontalAlignment(JLabel.RIGHT);
Number num = (Number) value;
String text = nf.format(num);
label.setText(text);
}
return c;
}
}
}