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Java编写购物车系统

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可购物的商品和价钱存放在list1.java中， 

String[] list1={"001","笔记本","3","0"};
    String[] list2={"002","笔记本1","3","0"};
    
    String[] list3={"003","笔记本2","3","0"};
    String[] list4={"004","笔记本3","3","0"};

可以修改或增加上面的内容，来改变购物的类别，和数量，下附程序源代码： 

            import
             java.awt.BorderLayout;

            import
             javax.swing.JFrame;

            import
             javax.swing.JPanel;

            import
             javax.swing.border.EmptyBorder;

            import
             javax.swing.JButton;

            import
             javax.swing.JLabel;

            import
             java.awt.GridLayout;

            import
             javax.swing.JTextField;

            import
             java.awt.event.ActionListener;

            import
             java.awt.event.ActionEvent;


            public
            class list extends JFrame {
    public list() {
    }
    private list1        li ; 
    private JPanel contentPane;
    private JTextField textField;
    private JTextField textField_1;
    private JLabel lblNewLabel;
    private JButton btnNewButton;
    private JButton btnNewButton_1;
    private JLabel lblNewLabel_1;
    private JLabel lblNewLabel_2;
    String str="",str1="";

    publicvoid list_11() {
        li = new list1();
        setTitle("购物车");
    
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 0));
        setContentPane(contentPane);
        
        JPanel panel = new JPanel();
        contentPane.add(panel, BorderLayout.NORTH);
        
        lblNewLabel = new JLabel("请输入");
        panel.add(lblNewLabel);
        
        JPanel panel_1 = new JPanel();
        contentPane.add(panel_1, BorderLayout.SOUTH);
        
        btnNewButton = new JButton("确定");
        btnNewButton.addActionListener(new ActionListener() {
            publicvoid actionPerformed(ActionEvent e) {
            }
        });
        panel_1.add(btnNewButton);
        
        btnNewButton_1 = new JButton("清除");
        btnNewButton_1.addActionListener(new ActionListener() {
            publicvoid actionPerformed(ActionEvent e) {
                
            }
        });
        panel_1.add(btnNewButton_1);
        
        JPanel panel_2 = new JPanel();
        contentPane.add(panel_2, BorderLayout.CENTER);
        panel_2.setLayout(new GridLayout(0, 1, 2, 0));
        
        JPanel panel_3 = new JPanel();
        panel_2.add(panel_3);
        
        lblNewLabel_1 = new JLabel("商品编号");
        panel_3.add(lblNewLabel_1);
        
        textField = new JTextField();
        panel_3.add(textField);
        textField.setColumns(10);
        
        JPanel panel_4 = new JPanel();
        panel_2.add(panel_4);
        
        lblNewLabel_2 = new JLabel("商品数量");
        panel_4.add(lblNewLabel_2);
        
        textField_1 = new JTextField();
        panel_4.add(textField_1);
        textField_1.setColumns(10);
        setVisible(true);
    
        btnNewButton.addActionListener(new ActionListener() {
            
            @Override
            publicvoid actionPerformed(ActionEvent e) {
            
            li.list_1(textField.getText(),textField_1.getText());
            
            }
        });
        btnNewButton_1.addActionListener(new ActionListener() {
            
            @Override
            publicvoid actionPerformed(ActionEvent e) {
                textField.setText("");
                textField_1.setText("");
                
            }
        });
    }
    publicstaticvoid main(String[] args) {
        new list().list_11();
    }
    public String S1(){
        return str;
        
    }
    public String S2(){
        return str1;
        
    }
    

}
            import
             java.awt.BorderLayout;

            import
             javax.swing.JFrame;

            import
             javax.swing.JPanel;

            import
             javax.swing.border.EmptyBorder;

            import
             javax.swing.JLabel;

            import
             javax.swing.JOptionPane;

            import
             javax.swing.JButton;

            import
             java.awt.GridLayout;

            import
             java.awt.event.ActionEvent;

            import
             java.awt.event.ActionListener;


            import
             javax.swing.JTextField;


            public
            class list1 extends JFrame {
    String[] list1={"001","笔记本","3","0"};
    String[] list2={"002","笔记本1","3","0"};
    
    String[] list3={"003","笔记本2","3","0"};
    String[] list4={"004","笔记本3","3","0"};
    int flag = 0;
    double sum=0;
    list li;
    private JPanel contentPane;
    private JLabel lblNewLabel;
    private JPanel panel;
    private JPanel panel_1;
    private JButton btnNewButton;
    private JButton btnNewButton_1;
    private JPanel panel_2;
    private JPanel panel_3;
    private JLabel lblNewLabel_1;
    private JLabel lblNewLabel_2;
    private JLabel lblNewLabel_3;
    private JLabel lblNewLabel_4;
    private JLabel lblNewLabel_5;
    private JLabel lblNewLabel_6;
    private JLabel lblNewLabel_7;
    private JLabel lblNewLabel_8;
    private JLabel lblNewLabel_9;
    private JLabel lblNewLabel_10;
    private JLabel lblNewLabel_11;
    private JLabel lblNewLabel_12;
    private JLabel lblNewLabel_13;
    private JLabel lblNewLabel_14;
    private JLabel lblNewLabel_15;
    private JLabel lblNewLabel_16;
    private JLabel lblNewLabel_17;
    private JLabel lblNewLabel_18;
    private JLabel lblNewLabel_19;
    private JLabel lblNewLabel_20;
    private JLabel lblNewLabel_21;
    private JLabel lblNewLabel_22;
    private JButton btnNewButton_2;
    


    public  list1() {
        li = new list();
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setTitle("购物清单");
        setBounds(100, 100, 483, 528);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 0));
        setContentPane(contentPane);
        
        panel = new JPanel();
        contentPane.add(panel, BorderLayout.NORTH);
        
        lblNewLabel = new JLabel("购物清单");
        panel.add(lblNewLabel);
        
        panel_1 = new JPanel();
        contentPane.add(panel_1, BorderLayout.SOUTH);
        
        btnNewButton = new JButton("结账");
        panel_1.add(btnNewButton);
        
    
    
        
        panel_2 = new JPanel();
        contentPane.add(panel_2, BorderLayout.CENTER);
        panel_2.setLayout(new GridLayout(0, 4, 4, 0));
        
        panel_3 = new JPanel();
        panel_2.add(panel_3);
        
        lblNewLabel_1 = new JLabel("商品编号");
        panel_3.add(lblNewLabel_1);
        
        JPanel panel_4 = new JPanel();
        panel_2.add(panel_4);
        
        lblNewLabel_2 = new JLabel("名称");
        panel_4.add(lblNewLabel_2);
        
        JPanel panel_5 = new JPanel();
        panel_2.add(panel_5);
        
        lblNewLabel_3 = new JLabel("单价(元)");
        panel_5.add(lblNewLabel_3);
        
        JPanel panel_6 = new JPanel();
        panel_2.add(panel_6);
        
        lblNewLabel_4 = new JLabel("数量");
        panel_6.add(lblNewLabel_4);
        
        JPanel panel_7 = new JPanel();
        panel_2.add(panel_7);
        
        lblNewLabel_5 = new JLabel();
        panel_7.add(lblNewLabel_5);
        
        JPanel panel_8 = new JPanel();
        panel_2.add(panel_8);
        
        lblNewLabel_6 = new JLabel();
        panel_8.add(lblNewLabel_6);
        
        JPanel panel_9 = new JPanel();
        panel_2.add(panel_9);
        
        lblNewLabel_7 = new JLabel();
        panel_9.add(lblNewLabel_7);
        
        JPanel panel_10 = new JPanel();
        panel_2.add(panel_10);
        
        lblNewLabel_8 = new JLabel();
        panel_10.add(lblNewLabel_8);
        
        JPanel panel_11 = new JPanel();
        panel_2.add(panel_11);
        
        lblNewLabel_9 = new JLabel();
        panel_11.add(lblNewLabel_9);
        
        JPanel panel_12 = new JPanel();
        panel_2.add(panel_12);
        
        lblNewLabel_10 = new JLabel();
        panel_12.add(lblNewLabel_10);
        
        JPanel panel_13 = new JPanel();
        panel_2.add(panel_13);
        
        lblNewLabel_11 = new JLabel();
        panel_13.add(lblNewLabel_11);
        
        JPanel panel_14 = new JPanel();
        panel_2.add(panel_14);
        
        lblNewLabel_12 = new JLabel();
        panel_14.add(lblNewLabel_12);
        
        JPanel panel_15 = new JPanel();
        panel_2.add(panel_15);
        
        lblNewLabel_13 = new JLabel();
        panel_15.add(lblNewLabel_13);
        
        JPanel panel_16 = new JPanel();
        panel_2.add(panel_16);
        
        lblNewLabel_14 = new JLabel();
        panel_16.add(lblNewLabel_14);
        
        JPanel panel_17 = new JPanel();
        panel_2.add(panel_17);
        
        lblNewLabel_15 = new JLabel();
        panel_17.add(lblNewLabel_15);
        
        JPanel panel_18 = new JPanel();
        panel_2.add(panel_18);
        
        lblNewLabel_16 = new JLabel();
        panel_18.add(lblNewLabel_16);
        
        JPanel panel_19 = new JPanel();
        panel_2.add(panel_19);
        
        lblNewLabel_17 = new JLabel();
        panel_19.add(lblNewLabel_17);
        
        JPanel panel_20 = new JPanel();
        panel_2.add(panel_20);
        
        lblNewLabel_18 = new JLabel("");
        panel_20.add(lblNewLabel_18);
        
        JPanel panel_21 = new JPanel();
        panel_2.add(panel_21);
        
        lblNewLabel_19 = new JLabel("");
        panel_21.add(lblNewLabel_19);
        
        JPanel panel_22 = new JPanel();
        panel_2.add(panel_22);
        
        lblNewLabel_20 = new JLabel("");
        panel_22.add(lblNewLabel_20);
        
        JPanel panel_23 = new JPanel();
        panel_2.add(panel_23);
        
        lblNewLabel_21 = new JLabel("总价：");
        panel_23.add(lblNewLabel_21);
        
        JPanel panel_24 = new JPanel();
        panel_2.add(panel_24);
        
        lblNewLabel_22 = new JLabel("0元");
        panel_24.add(lblNewLabel_22);
    
        setVisible(true);
btnNewButton.addActionListener(new ActionListener() {
            
            @Override
            publicvoid actionPerformed(ActionEvent e) {
                JOptionPane.showConfirmDialog(null, "您的消费总额为"+sum+"元");
                
            }
        });
    
    
    }
    publicvoid list_1(String str1,String str2){
        if(str1.equals(list1[0]))
        {
            lblNewLabel_5.setText(list1[0]);
            lblNewLabel_6.setText(list1[1]);
            lblNewLabel_7.setText(list1[2]);
            list1[3]=str2;
            lblNewLabel_8.setText(list1[3]);
            Double d1 = new Double(list1[2]);
            Double d2 = new Double(list1[3]);
            sum =sum+ d1*d2;
        }
        if(str1.equals(list2[0]))
        {
            lblNewLabel_9.setText(list2[0]);
            lblNewLabel_10.setText(list2[1]);
            lblNewLabel_11.setText(list2[2]);
            list2[3]=str2;
            lblNewLabel_12.setText(list2[3]);
            Double d3 = new Double(list2[2]);
            Double d4 = new Double(list2[3]);
            sum =sum+ d3*d4;
        }
        if(str1.equals(list3[0]))
        {
            lblNewLabel_13.setText(list3[0]);
            lblNewLabel_14.setText(list3[1]);
            lblNewLabel_15.setText(list3[2]);
            
            list3[3]=str2;
            lblNewLabel_16.setText(list3[3]);
            Double d5 = new Double(list3[2]);
            Double d6 = new Double(list3[3]);
            sum =sum+ d5*d6;
        }
        if(str1.equals(list4[0]))
        {
            lblNewLabel_17.setText(list4[0]);
            lblNewLabel_18.setText(list4[1]);
            lblNewLabel_19.setText(list4[2]);
            list4[3]=str2;
            lblNewLabel_20.setText(list4[3]);
            Double d7 = new Double(list4[2]);
            Double d8 = new Double(list4[3]);
            sum =sum+ d7*d8;
        }
        lblNewLabel_22.setText(sum+"元");
        
    }
    
    

}

原文：http://www.cnblogs.com/qq1402876003/p/4998595.html

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