如何减去两个列值并显示在java中的另一列中
在我的代码中，我想减去列数量和成本值，并将其显示在利润列上。
这是我的代码......
package my.bill;
import java.awt.*;
import java.awt.event.*;
import java.awt.event.*;
import java.io.*;
import java.lang.*;
import java.sql.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.*;
import java.util.Calendar;
import java.util.GregorianCalendar;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import javax .swing.table.DefaultTableModel;
public class bill extends javax.swing.JFrame {
/**
* Creates new form bill
*/
Object[][] data=null;
String[] columnNames = new String[2];
/*static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL="jdbc:mysql://localhost:3306/gdb?zeroDateTimeBehavior=convertToNull";
//static final String DB_URL = "jdbc:mysql://localhost/";
// Database credentials
static final String USER = "root";
static final String PASS = "root";*/
public bill() {
initComponents();
CurrentDate();
}
public void CurrentDate(){
Calendar cal=new GregorianCalendar();
int month=cal.get(Calendar.MONTH);
int year=cal.get(Calendar.YEAR);
int day=cal.get(Calendar.DAY_OF_MONTH);
Date.setText(day+"-"+(month+1)+"-"+year);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
Date = new javax.swing.JTextField();
jScrollPane2 = new javax.swing.JScrollPane();
jTable1 = new javax.swing.JTable();
netprofit = new javax.swing.JButton();
netsum = new javax.swing.JTextField();
save = new javax.swing.JButton();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
jMenu2 = new javax.swing.JMenu();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("Date");
Date.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
DateActionPerformed(evt);
}
});
jTable1.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));
jTable1.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
jTable1.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{"", null, null, null, null, null},
{"", null, null, null, "", null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null},
{null, null, null, null, null, null}
},
new String [] {
"JNo", "Item", "Amount", "cost", "Profit", "P"
}
));
jTable1.setColumnSelectionAllowed(true);
jTable1.setGridColor(new java.awt.Color(0, 0, 0));
jTable1.setRowHeight(20);
jTable1.setRowMargin(2);
jTable1.setSelectionBackground(new java.awt.Color(255, 255, 255));
jTable1.addInputMethodListener(new java.awt.event.InputMethodListener() {
public void caretPositionChanged(java.awt.event.InputMethodEvent evt) {
}
public void inputMethodTextChanged(java.awt.event.InputMethodEvent evt) {
jTable1InputMethodTextChanged(evt);
}
});
jScrollPane2.setViewportView(jTable1);
jTable1.getColumnModel().getSelectionModel().setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION);
if (jTable1.getColumnModel().getColumnCount() > 0) {
jTable1.getColumnModel().getColumn(0).setHeaderValue("Job No");
jTable1.getColumnModel().getColumn(1).setHeaderValue("Item");
jTable1.getColumnModel().getColumn(2).setHeaderValue("Billed Amount");
jTable1.getColumnModel().getColumn(3).setHeaderValue("Parts cost");
jTable1.getColumnModel().getColumn(4).setHeaderValue("Net Profit");
jTable1.getColumnModel().getColumn(5).setHeaderValue("Percentage");
}
netprofit.setText("Total Profit");
netprofit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
netprofitActionPerformed(evt);
}
});
save.setText("Save");
save.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
saveActionPerformed(evt);
}
});
jMenu1.setText("File");
jMenuBar1.add(jMenu1);
jMenu2.setText("Edit");
jMenuBar1.add(jMenu2);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane2)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(114, 114, 114)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(Date, javax.swing.GroupLayout.PREFERRED_SIZE, 77, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(350, 350, 350)
.addComponent(netprofit)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(netsum, javax.swing.GroupLayout.PREFERRED_SIZE, 75, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(221, 221, 221)
.addComponent(save)))
.addContainerGap(147, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(20, 20, 20)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 24, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(Date, javax.swing.GroupLayout.PREFERRED_SIZE, 29, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 350, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(netprofit)
.addComponent(netsum, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(1, 1, 1)
.addComponent(save)
.addContainerGap(32, Short.MAX_VALUE))
);
Date.getAccessibleContext().setAccessibleName("date");
save.getAccessibleContext().setAccessibleName("save");
pack();
}// </editor-fold>
private void DateActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void netprofitActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void saveActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
Connection conn = null;
Statement stmt = null;
int count=jTable1.getRowCount();
int col=jTable1.getColumnCount();
String jobno[] =new String[count]; // name is array and index 4 means no. of row
String item[]=new String[count];
String bill[] =new String[count]; // name is array and index 4 means no. of row
String part[]=new String[count];
String profit[] =new String[count]; // name is array and index 4 means no. of row
String percent[]=new String[count];
for(int i=0;i<=count;i++)
{
for(int j=0;j<=col;j++)
{
no[i]=jTable1.getValueAt(i,j).toString(); // it get value from 0 row and 0 column
it[i]=jTable1.getValueAt(i,j).toString();
amount[i]=jTable1.getValueAt(i,j).toString();
p[i]=jTable1.getValueAt(i,j).toString();
cost[i]=jTable1.getValueAt(i,j).toString();
s[i]=jTable1.getValueAt(i,j).toString();
try{
String sql="INSERT INTO m (no,it,amount,cost,sell,p,date) VALUES('"+no[i]+"','"+it[i]+"','"+amount[i]+"','"+p[i]+"','"+cost[i]+"','"+s[i]+"','"+Date.getText()+"')";
// stmt.execute(sql);
stmt.executeQuery(sql);
//stmt.execute(sql);
/*PreparedStatement ps=conn.prepareStatement(sql);
ps.setString(1, "");
ps.setString(2, "");
ps.setString(3, "");
ps.setString(4, "");
ps.setString(5, "");
ps.setString(6, "");
ps.setString(7,Date.getText());
ps.execute();*/
JOptionPane.showMessageDialog(null,"saved");
}
catch(Exception e){
JOptionPane.showMessageDialog(null,e);
}
}
}
private void jTable1InputMethodTextChanged(java.awt.event.InputMethodEvent evt) {
// TODO add your handling code here:
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(bill.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(bill.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(bill.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(bill.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
Connection conn = null;
Statement stmt = null;
try{
//STEP 2: Register JDBC driver
Class.forName("com.mysql.jdbc.Driver");
//Class.forName("jdbc:mysql://localhost:3306/ganpatidb?zeroDateTimeBehavior=convertToNull");
//STEP 3: Open a connection
System.out.println("Connecting to database...");
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/ganpatidb", "root", "root");
//STEP 4: Execute a query
System.out.println("Creating database...");
stmt = conn.createStatement();
}catch(SQLException se){
//Handle errors for JDBC
// se.printStackTrace();
}catch(Exception e){
//Handle errors for Class.forName
// e.printStackTrace();
}finally{
//finally block used to close resources
try{
if(stmt!=null)
stmt.close();
}catch(SQLException se2){
}// nothing we can do
try{
if(conn!=null)
conn.close();
}catch(SQLException se){
//se.printStackTrace();
}//end finally try
}//end try
//System.out.println("Goodbye!");
//int r=jTable1.selectedrow;
//jTable1.getValue(3,3);
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new bill().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTextField Date;
private javax.swing.JLabel jLabel1;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenu jMenu2;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTable jTable1;
private javax.swing.JButton netprofit;
private javax.swing.JTextField netsum;
private javax.swing.JButton save;
// End of variables declaration
}
我想知道如何自动减去另一列中显示的两个列值？
1 个答案:
答案 0 :(得分：2)
您需要使用AbstractTableModel或覆盖DefaultTableModel
在任何一种情况下，都有（至少）两种方法可以做到这一点......
你可以......
覆盖getValueAt方法，当询问指定列的值时，计算返回结果的数量...
public Object getValueAt(int row, int col) {
Object value = null;
switch (col) {
case 4:
double amount = (Double)getValueAt(row, 2);
double cost = (Double)getValueAt(row, 3);
value = cost - amount;
break;
}
return value;
}
我在这里做出假设来证明这一点。如果您正在使用DefaultTableModel，则只需致电super.getValueAt(row, col)即可自动获取其他单元格的值...
public Object getValueAt(int row, int col) {
Object value = null;
switch (col) {
case 4:
double amount = (Double)getValueAt(row, 2);
double cost = (Double)getValueAt(row, 3);
value = cost - amount;
break;
default:
value = super.getValueAt(row, col);
}
return value;
}
如果数据不可编辑（大部分是静态的）并且行数据完成，这非常好，否则......
你可以......
重写setValueAt方法，相应地修改利润值......
public void setValueAt(int row, int col, Object value) {
if (col != 4) {
super.setValueAt(row, col, value);
if (col == 2 || col == 3) {
double amount = (Double)getValueAt(row, 2);
double cost = (Double)getValueAt(row, 3);
setValueAt(row, 4, amount - cost);
}
}
}
如果数据不是静态的并且用户将其直接输入表格中，则效果会更好......
声明
为简单起见，我对数据类型做了假设，您可能需要将数据转换为适当的计算格式
更新了简单示例
DefaultTableModel model = new DefaultTableModel(
new String[]{"JNo", "Item", "Amount", "cost", "Profit", "P"}, 0) {
@Override
public Object getValueAt(int row, int col) {
Object value = null;
switch (col) {
case 4:
double amount = (Double) getValueAt(row, 2);
double cost = (Double) getValueAt(row, 3);
value = cost - amount;
break;
default:
value = super.getValueAt(row, col);
}
return value;
}
};
概念证明
这只是一个概念证明，不要将其复制并粘贴到您的代码中并期望它神奇地工作，您将不得不修改它以满足您的需求...... < / p>
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableModel;
public class AutoSumming {
public static void main(String[] args) {
new AutoSumming();
}
public AutoSumming() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
DefaultTableModel model = new DefaultTableModel(
new String[]{"Amount", "Cost", "Profit"},
10) {
@Override
public Object getValueAt(int row, int col) {
Object value = null;
switch (col) {
case 2:
double amount = getAmountForRow(row);
double cost = getCostForRow(row);
value = cost - amount;
break;
default:
value = super.getValueAt(row, col);
}
return value;
}
protected double getAmountForRow(int row) {
return getNumberForRow(row, 0);
}
protected double getCostForRow(int row) {
return getNumberForRow(row, 1);
}
protected double getNumberForRow(int row, int col) {
double number = 0;
Object value = getValueAt(row, col);
if (value != null && value instanceof Number) {
number = ((Number) value).doubleValue();
}
return number;
}
@Override
public void setValueAt(Object aValue, int row, int column) {
if (column != 2) {
if (aValue instanceof Number) {
super.setValueAt(aValue, row, column);
if (column == 0 || column == 1) {
fireTableCellUpdated(row, 2);
}
}
}
}
@Override
public Class<?> getColumnClass(int columnIndex) {
return Double.class;
}
@Override
public boolean isCellEditable(int row, int column) {
return column != 2;
}
};
JTable table = new JTable(model);
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(table));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
仔细查看How to use tables，以便更好地了解此示例的工作原理
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