沃商店java业务代码 沃商店客户端

java 构造函数可以写业务代码？

构造方法就是初始化这个对象沃商店java业务代码的时候调用,可不可以写业务代码,这个没有限制沃商店java业务代码的

有些时候沃商店java业务代码我们创建一个对象,又必须给某些属性或者说字段赋值的时候,那么就可以在构造方法里进行赋值

super();

是表示调用父类的构造方法(函数),是默认的

沃商店java业务代码你可以把它删除掉,编译器会自动在构造方法第一条语句增加这个的,

class反编译过来,构造方法的第一条语句也会是super();

请采纳哈.

相关问答

Q1: 亲有java语言写的超市管理系统课程设计和源代码吗，能给我吗

package untitled5;

import java.io.*;

import java.net.*;

import java.sql.*;

import java.lang.*;

import javax.sql.*;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import com.borland.jbcl.layout.*;

public class delbook extends JFrame {

JPanel contentPane;

XYLayout xYLayout1 = new XYLayout();

JLabel jLabel1 = new JLabel();

JLabel jLabel2 = new JLabel();

JLabel jLabel3 = new JLabel();

JTextField jTextField1 = new JTextField();

JLabel jLabel4 = new JLabel();

JTextField jTextField2 = new JTextField();

JLabel jLabel5 = new JLabel();

JTextField jTextField3 = new JTextField();

JLabel jLabel6 = new JLabel();

JTextField jTextField4 = new JTextField();

JButton jButton1 = new JButton();

//Construct the frame

public delbook() {

enableEvents(AWTEvent.WINDOW_EVENT_MASK);

try {

jbInit();

}

catch(Exception e) {

e.printStackTrace();

}

}

//Component initialization

private void jbInit() throws Exception {

contentPane = (JPanel) this.getContentPane();

jLabel1.setFont(new java.awt.Font("SansSerif", 0, 25));

jLabel1.setForeground(Color.red);

jLabel1.setText("超市管理系统");

contentPane.setLayout(xYLayout1);

this.setSize(new Dimension(500,400));

this.setTitle("超市管理系统");

jLabel2.setFont(new java.awt.Font("SansSerif", 0, 30));

jLabel2.setText("业务单位信息");

jLabel3.setFont(new java.awt.Font("SansSerif", 0, 25));

jLabel3.setText("产品编号");

jTextField1.setText("");

jLabel4.setFont(new java.awt.Font("SansSerif", 0, 25));

jLabel4.setText("公司名称");

jTextField2.setText("");

jLabel5.setFont(new java.awt.Font("SansSerif", 0, 25));

jLabel5.setText("订单号码");

jTextField3.setText("");

jLabel6.setFont(new java.awt.Font("SansSerif", 0, 25));

jLabel6.setText("电 话");

jTextField4.setText("");

jButton1.setFont(new java.awt.Font("SansSerif", 0, 25));

jButton1.setText("提交");

jButton1.addActionListener(new delbook_jButton1_actionAdapter(this));

contentPane.add(jLabel1, new XYConstraints(179, 1, 153, 32));

contentPane.add(jLabel2, new XYConstraints(162, 33, -1, -1));

contentPane.add(jLabel3, new XYConstraints(83, 89, -1, -1));

contentPane.add(jTextField1, new XYConstraints(189, 88, 141, 36));

contentPane.add(jTextField2, new XYConstraints(189, 149, 142, 36));

contentPane.add(jLabel4, new XYConstraints(84, 148, -1, -1));

contentPane.add(jTextField3, new XYConstraints(188, 206, 143, 33));

contentPane.add(jLabel5, new XYConstraints(84, 204, -1, -1));

contentPane.add(jLabel6, new XYConstraints(84, 253, -1, -1));

contentPane.add(jTextField4, new XYConstraints(189, 260, 143, 36));

contentPane.add(jButton1, new XYConstraints(197, 318, -1, -1));

}

//Overridden so we can exit when window is closed

protected void processWindowEvent(WindowEvent e) {

super.processWindowEvent(e);

if (e.getID() == WindowEvent.WINDOW_CLOSING) {

System.exit(0);

}

}

void update() {

try {

//定义显示的字符串

String str1;

String str2;

String str3;

String str4;

str1 = jTextField1.getText();

str2 = jTextField2.getText();

str3 = jTextField3.getText();

str4 = jTextField4.getText();

//装载jdbc驱动程序

String driverName = "oracle.jdbc.OracleDriver";

Driver driver = (Driver) Class.forName(driverName).newInstance();

//连接数据库

Connection con = DriverManager.getConnection(

"jdbc:oracle:thin:@thsspc0791:1521:liuyong", "hr", "tongfang");

PreparedStatement pstmt = con.prepareStatement(

" insert Customer1('goodID','Name','PID','tel')values(?,?,?,?)");

pstmt.setString(1, str1);

pstmt.setString(2, str2);

pstmt.setString(1, str3);

pstmt.setString(4, str4);

ResultSet res = pstmt.executeQuery();

pstmt.close();

con.close();

}catch (InstantiationException e) {

System.out.println(e.getMessage());

}catch (IllegalAccessException e) {

System.out.println(e.getMessage());

}catch (ClassNotFoundException e) {

System.out.println(e.getMessage());

}catch (SQLException edd) {

edd.printStackTrace() ;

System.out.println(edd.getMessage());

}

}

void jButton1_actionPerformed(ActionEvent e) {

update();

}

}

class delbook_jButton1_actionAdapter implements java.awt.event.ActionListener {

delbook adaptee;

delbook_jButton1_actionAdapter(delbook adaptee) {

this.adaptee = adaptee;

}

public void actionPerformed(ActionEvent e) {

adaptee.jButton1_actionPerformed(e);

}

}

package untitled5;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import com.borland.jbcl.layout.*;

/**

* pTitle: /p

* pDescription: /p

* pCopyright: Copyright © 2003/p

* pCompany: /p

* @author not attributable

* @version 1.0

*/

public class retur extends JFrame {

JPanel contentPane;

XYLayout xYLayout1 = new XYLayout();

JLabel jLabel1 = new JLabel();

//Construct the frame

public retur() {

enableEvents(AWTEvent.WINDOW_EVENT_MASK);

try {

jbInit();

}

catch(Exception e) {

e.printStackTrace();

}

}

//Component initialization

private void jbInit() throws Exception {

contentPane = (JPanel) this.getContentPane();

jLabel1.setFont(new java.awt.Font("SansSerif", 0, 20));

jLabel1.setForeground(Color.red);

jLabel1.setText("超市管理系统");

contentPane.setLayout(xYLayout1);

this.setSize(new Dimension(400, 300));

this.setTitle("超市管理系统");

contentPane.add(jLabel1, new XYConstraints(139, 1, 126, 33));

}

//Overridden so we can exit when window is closed

protected void processWindowEvent(WindowEvent e) {

super.processWindowEvent(e);

if (e.getID() == WindowEvent.WINDOW_CLOSING) {

System.exit(0);

}

}

}

package untitled5;

import java.io.*;

import java.net.*;

import java.sql.*;

import java.lang.*;

import javax.sql.*;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import com.borland.jbcl.layout.*;

import com.borland.dbswing.*;

//货品信息登记

public class Frame2 extends JFrame {

JPanel contentPane;

JLabel jLabel1 = new JLabel();

XYLayout xYLayout1 = new XYLayout();

JLabel jLabel2 = new JLabel();

JLabel jLabel3 = new JLabel();

JTextField jTextField1 = new JTextField();

JLabel jLabel4 = new JLabel();

JTextField jTextField2 = new JTextField();

JPanel jPanel1 = new JPanel();

XYLayout xYLayout2 = new XYLayout();

JScrollPane jScrollPane1 = new JScrollPane();

JLabel jLabel5 = new JLabel();

JTextField jTextField3 = new JTextField();

//Construct the frame

public Frame2() {

enableEvents(AWTEvent.WINDOW_EVENT_MASK);

try {

jbInit();

}

catch(Exception e) {

e.printStackTrace();

}

}

//Component initialization

private void jbInit() throws Exception {

contentPane = (JPanel) this.getContentPane();

contentPane.setLayout(xYLayout1);

this.setSize(new Dimension(600, 500));

this.setTitle("超市管理系统");

this.addHierarchyBoundsListener(new Frame2_this_hierarchyBoundsAdapter(this));

jLabel1.setFont(new java.awt.Font("SansSerif", 0, 25));

jLabel1.setForeground(Color.red);

jLabel1.setText("超市管理系统");

contentPane.setForeground(Color.black);

jLabel2.setFont(new java.awt.Font("SansSerif", 0, 30));

jLabel2.setText("产 品 信 息 展 示");

// statusBar.setFont(new java.awt.Font("SansSerif", 0, 20));

jLabel3.setFont(new java.awt.Font("SansSerif", 0, 20));

jLabel3.setText("产品名称");

jTextField1.setText("");

jLabel4.setEnabled(true);

jLabel4.setFont(new java.awt.Font("SansSerif", 0, 20));

jLabel4.setText("产品ID号");

jTextField2.setText("");

jTextField2.addActionListener(new Frame2_jTextField2_actionAdapter(this));

jPanel1.setLayout(xYLayout2);

jLabel5.setFont(new java.awt.Font("SansSerif", 0, 25));

jLabel5.setForeground(Color.red);

jLabel5.setText("该产品详细信息");

jTextField3.setText("");

contentPane.add(jLabel1, new XYConstraints(237, 0, 153, 40));

contentPane.add(jLabel2, new XYConstraints(200, 47, 231, 58));

contentPane.add(jLabel3, new XYConstraints(47, 102, 101, 42));

contentPane.add(jTextField1, new XYConstraints(128, 108, 112, 34));

contentPane.add(jTextField2, new XYConstraints(361, 107, 109, 36));

contentPane.add(jPanel1, new XYConstraints(75, 166, 453, 277));

jPanel1.add(jScrollPane1, new XYConstraints(14, 8, 433, 221));

jScrollPane1.getViewport().add(jTextField3, null);

jPanel1.add(jLabel5, new XYConstraints(112, 240, -1, -1));

contentPane.add(jLabel4, new XYConstraints(278, 111, -1, -1));

}

//Overridden so we can exit when window is closed

protected void processWindowEvent(WindowEvent e) {

super.processWindowEvent(e);

if (e.getID() == WindowEvent.WINDOW_CLOSING) {

System.exit(0);

}

}

void Select() {

try {

String str1, str2;

str1 = jTextField1.getText();

str2 = jTextField2.getText();

Q2: G网JAVA业务沃商店5元按次-2什么业务，为什么要扣我钱

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