不同等級

Question

下面的代碼中記錄了錯誤行。我注意到的是，如果我突出顯示Customer這個詞並按住Ctrl-T，它將顯示Customer - SwimCalc這個正確的等級。但是，如果我做同樣的承包商，它說承包商 - SwimCalc.Customer

public class SwimCalc extends JFrame implements ActionListener { 
    private JTabbedPane jtabbedPane; 
    private JPanel Customers; 
    private JPanel Contractors; 
    private List<Customer> customers = new ArrayList<Customer>(); 

    // this fails 
    private List<Contractor> contractors = new ArrayList<Contractor>(); 

    JTextArea NameTextCustomers, ExistTextCustomers, MessageTextCustomers, 
    NameTextContractors, ExistTextContractors, MessageTextContractors; 
    JTextField lengthTextPool, widthTextPool, depthTextPool, volumeTextPool; 

    public SwimCalc() { 
     setTitle("Volume Calculator"); 
     setSize (300, 200); 

     JPanel topPanel = new JPanel(); 
     topPanel.setLayout(new BorderLayout()); 
     getContentPane().add(topPanel); 

     createCustomers(); 
     createContractors(); 

     jtabbedPane = new JTabbedPane(); 
     jtabbedPane.addTab("Customer", Customers); 
     topPanel.add(jtabbedPane, BorderLayout.CENTER); 
    } 
} 

Answer 1

錯誤「承包人不能被解析爲一個類型」可能意味着

• 你永遠在你的代碼
寫道： class Contractor {...}任何地方
• 的Eclipse不能編譯整個項目，因爲某些構建路徑問題（檢查構建路徑錯誤的問題視圖）
• 你忘了導入類型Contractor