public?abstract?class?Mainform?extends?JFrame{
?protected?JPanel?pnlContent?=?null;
?protected?JPanel?pnlInformation?=?null;
?protected?JPanel?pnlButton?=?null;
?protected?JPanel?pnlTime?=?null;
?
?protected?JList<String>?jList?=?null;
?protected?DefaultListModel<String>?model?=?null;
?protected?ProductController?productController?=?null;
?
?protected?Cart?cart?=?null;
?protected?JButton?btnAdd?=?null;?
?protected?JTextArea?txtInform?=?null;
?protected?JScrollPane?scrollpnl?=?null;
?
?public?Mainform(){
??
??this.setSize(new?Dimension(800,600));
??this.setBackground(Color.LIGHT_GRAY);
??this.setLocationRelativeTo(null);
??this.setTitle("Gourmet?Coffee?System");
??this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
??
??pnlContent?=?new?JPanel();?
??pnlTime?=?new?TimePanel();?
??pnlInformation?=?new?JPanel();
??pnlInformation.setBackground(Color.GRAY);?
??pnlButton?=?new?JPanel();
??pnlButton.setBackground(Color.white);?
??txtInform?=?new?JTextArea(500,600);
??
??
??setList();
??this.add(pnlTime,?BorderLayout.NORTH);
??this.add(pnlContent,BorderLayout.WEST);
??this.add(pnlButton,BorderLayout.SOUTH);
??
??addButton(pnlButton);
??
??
??showFrame();
?}
?
?private?void?showFrame()?{
??this.setVisible(true);
?}
?
?public?void?setList(){
??
??model?=?new?DefaultListModel<String>();
??productController?=?new?ProductController("information","Product.txt");
??for(Product?product:?productController.readObject("information",?"Product.txt")){
???model.addElement(product.getCode());
??}
??jList?=?new?JList(model);
??jList.setPreferredSize(new?Dimension(200,600));
??pnlContent.add(jList);
??setText();
?}
?
?
?public?void?setText(){
??txtInform.setLineWrap(true);
??txtInform.setEditable(false);
??txtInform.setBackground(Color.blue);
??jList.addListSelectionListener(new?ListSelectionListener(){
???@Override
???public?void?valueChanged(ListSelectionEvent?e)?{
????if(!jList.getValueIsAdjusting()){
????/*
?????*監(jiān)聽(tīng)過(guò)程中如果匹配，增加text內(nèi)容?
?????*/
????String?code?=?jList.getSelectedValue();
????ProductController?productcontroller?=?new?ProductController("information",?"Product.txt");
????ArrayList<Product>?products?=?
??????productcontroller.readObject("information",?"Product.txt");
?????for(Product?product:products){
??????if(code?==?product.getCode()){
???????txtInform.setText(product.toString());???
??????}
?????}
????}
???}
??});
??pnlInformation.add(txtInform);
??this.add(pnlInformation,BorderLayout.CENTER);
?}
?
?
?
?abstract?void?addButton(JPanel?pnlButton);參數(shù)：jList列出目錄jTextArea我希望JList在鼠標(biāo)點(diǎn)擊的時(shí)候能顯示商品的詳細(xì)信息，詳細(xì)信息用JTextArea等表示。為此設(shè)置了一個(gè)事件ListSelectionListener在內(nèi)部類里面讀取商品文件的信息（讀取文件的函數(shù)返回ArrayList）查看是否有匹配（通過(guò)比較商品的屬性---Code是否一致的方式）我認(rèn)為我的邏輯上應(yīng)該是沒(méi)有問(wèn)題的。在? txtInform.setText(product.toString());這句設(shè)了斷點(diǎn)以后似乎發(fā)現(xiàn)有線程的沖突，還有空指針異?！坎锁B(niǎo)一個(gè)，不懂怎么解決此類問(wèn)題…跪求大佬幫忙。這是設(shè)了斷點(diǎn)以后發(fā)現(xiàn)的問(wèn)題：剛剛step into?一步以后就顯示了這個(gè)…感謝?。。。?
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