摇摆不成文场警告（JAVA）

Question

我已经安装的FindBugs和if语句

if (source == this.temp) 

警告说，有一个不成文的领域得到actionPerformed方法的错误警告。该程序仍然编译，但当我点击名为temp的按钮时会挂起。

我以为我已经正确地初始化该字段。有人能指引我搞砸了吗？由于

import java.awt.Cursor; 
import java.awt.Dimension; 
import java.awt.GridLayout; 
import java.awt.event.ActionEvent; 

import javax.swing.ImageIcon; 
import javax.swing.JButton; 
import javax.swing.JComponent; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.JScrollPane; 
import javax.swing.JTabbedPane; 
import javax.swing.JTextArea; 
import javax.swing.border.EmptyBorder; 

import components.simplereader.SimpleReader; 
import components.simplereader.SimpleReader1L; 

/** 
* View class. 
* 
* @author Redacted 
*/ 
@SuppressWarnings("serial") 
public final class PasswordManagerView1 extends JFrame 
    implements PasswordManagerView { 

private JButton temp; 

/** 
* controller. 
*/ 
private PasswordManagerController controller; 

/** 
* Jpanel. 
*/ 

/** 
* Useful constants. 
*/ 
private Dimension maxSize; 
private JTabbedPane tabbedPane; 

/** 
* Constructor. 
*/ 
public PasswordManagerView1() { 
    super("Password Manager"); 
    JTabbedPane tabbedPane = new JTabbedPane(); 
    //Initial JPanel creation 
    tabbedPane.setBorder(new EmptyBorder(5, 5, 5, 5)); 
    //tabbedPane.setLayout(new BorderLayout(0, 0)); 
    this.maxSize = new Dimension(700, 300); 
    tabbedPane.setPreferredSize(this.maxSize); 
    this.getContentPane().add(tabbedPane); 

    //Initial JTabbedPane creation 

    //Tab creation 
    JComponent panel1 = this.makeTextPanel("temp1"); 
    ImageIcon icon = new ImageIcon("lock-icon.png"); 
    tabbedPane.addTab("Add Password", icon, panel1, 
      "Adds a password to the vault"); 
    JComponent panel2 = this.makeTextPanel("temp2"); 
    tabbedPane.addTab("Delete Password", icon, panel2, 
      "Deletes a password from the vault"); 
    JComponent panel3 = this.makeTextPanel("temp3"); 
    tabbedPane.addTab("Password Vault", icon, panel3, 
      "View the passwords in the vault"); 
    JComponent panel4 = this.makeInfoPanel(); 
    tabbedPane.addTab("Info/Settings", icon, panel4, 
      "View settings and program info"); 
    JButton temp = new JButton("Hey"); 
    panel1.add(temp); 
    temp.addActionListener(this); 
    //Pack up 
    this.pack(); 
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    this.setVisible(true); 
} 

private JComponent makeTextPanel(String text) { 
    JPanel panel = new JPanel(); 
    JLabel filler = new JLabel(text); 
    filler.setHorizontalAlignment(JLabel.CENTER); 
    panel.setLayout(new GridLayout(1, 1)); 
    panel.add(filler); 
    return panel; 
} 

private JComponent makeInfoPanel() { 
    JPanel panel = new JPanel(); 
    panel.setLayout(new GridLayout(1, 1)); 
    StringBuilder toPrint = new StringBuilder(); 
    SimpleReader in = new SimpleReader1L("data/Notice.txt"); 
    while (!in.atEOS()) { 
     toPrint.append(in.nextLine() + "\n"); 
    } 
    String toPrintString = toPrint.toString(); 
    JTextArea noticeText = new JTextArea(toPrintString); 
    noticeText.setEditable(false); 
    JScrollPane noticeTextScroll = new JScrollPane(noticeText); 
    panel.add(noticeTextScroll); 
    in.close(); 
    return panel; 

} 

@Override 
public void registerObserver(PasswordManagerController controller) { 
    this.controller = controller; 
} 

@Override 
public void actionPerformed(ActionEvent event) { 
    //Wait cursor 
    this.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR)); 

    //What button was pressed 
    Object source = event.getSource(); 
    if (source == this.temp) { 
     this.controller.processTestEvent(); 
    } 
} 

Answer 1

在你有这段代码构造：

JButton temp = new JButton("Hey"); 
panel1.add(temp); 

它定义了一个局部temp变量，阴影成员 - 删除JButton，以便它使用类成员：

temp = new JButton("Hey"); 
panel1.add(temp);