所以我差不多完成了这个项目，最后一件事是“隐藏”按钮。我的老师从来没有说过要做什么，但由于这让我烦恼，我找不到有效的答案，我想我会问你们好人。
我试过了：
setExtendedState(JFrame.ICONIFIED) //导致编译错误，无法找到我的变量名称setState(JFrame.ICONIFIED) //同样的问题，“找不到符号”，或者更确切地说找到我的变量setVisible(false) //这不起作用bc它隐藏了我的整个框架，如果不关闭程序我就无法取回它。我使用Container c = getContentPane()创建窗格，然后在主要内部使用：
ClassName variableName = new ClassName() to create the parameters.
这就是我的教学方式，我现在必须使用这种方式（因为这是我老师想要的），但我注意到还有其他方法可以达到同样的目标。
任何特定于我的程序的输入都会很棒！谢谢！
我的程序如下（我发布了所有内容，因此不会遗漏任何内容）：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Arrays;
public class Project9 extends JFrame
{
Font f1 = new Font("Serif", Font.BOLD, 30);
Font f2 = new Font("Serif", Font.PLAIN, 18);
private BOOKItem[] bookArray = new BOOKItem[10];
private JLabel headerLbl;
private JLabel messagesLbl;
private JTextField idLabelFld;
private JTextField idFld;
private JTextField priceLabelFld;
private JTextField priceFld;
private JTextField numInStockLabelFld;
private JTextField numInStockFld;
private JTextField codeLabelFld;
private JTextField codeFld;
private JTextField messagesFld;
private JButton insertBtn;
private JButton deleteBtn;
private JButton displayBtn;
private JButton displayOneBtn;
private JButton hideBtn;
private JButton clearBtn;
private String input = "";
private String displayOneStr = "";
private int idInput = 0;
private double priceInput = 0.0;
private int numInStockInput = 0;
private int codeInput = 0;
private int index = 0;
private int numItems = 0;
private int responseCode = 0;
private Container c = getContentPane();
//Main Method, sets arrayFrame params
public static void main(String[] args)
{
Project9 arrayFrame = new Project9();
arrayFrame.setSize(555,450);
arrayFrame.setVisible(true);
arrayFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
//Constructor
public Project9()
{
//Creates the array
for (int i = 0; i < bookArray.length; i++)
{
bookArray[i] = new BOOKItem();
System.out.println(bookArray[i]);
}
setTitle("Project 9");
c.setLayout(new FlowLayout());
headerLbl = new JLabel("Data Entry: BestBargainBook Store");
headerLbl.setFont(f1);
c.add(headerLbl);
idLabelFld = new JTextField("Enter ID:", 15);
idLabelFld.setEditable(false);
c.add(idLabelFld);
idFld = new JTextField(25);
c.add(idFld);
priceLabelFld = new JTextField("Enter Price:", 15);
priceLabelFld.setEditable(false);
c.add(priceLabelFld);
priceFld = new JTextField(25);
c.add(priceFld);
numInStockLabelFld = new JTextField("Enter Number In Stock:", 15);
numInStockLabelFld.setEditable(false);
c.add(numInStockLabelFld);
numInStockFld = new JTextField(25);
c.add(numInStockFld);
codeLabelFld = new JTextField("Enter Code: 1,2,3 or 4:", 15);
codeLabelFld.setEditable(false);
c.add(codeLabelFld);
codeFld = new JTextField(25);
c.add(codeFld);
insertBtn = new JButton("Insert");
c.add(insertBtn);
deleteBtn = new JButton("Delete");
c.add(deleteBtn);
displayBtn = new JButton("Display");
c.add(displayBtn);
displayOneBtn = new JButton("DisplayOne");
c.add(displayOneBtn);
hideBtn = new JButton("Hide");
c.add(hideBtn);
clearBtn = new JButton("Clear");
c.add(clearBtn);
messagesLbl = new JLabel("Messages:");
messagesLbl.setFont(f2);
c.add(messagesLbl);
messagesFld = new JTextField(30);
c.add(messagesFld);
//Event Listeners
insertBtn.addActionListener(new EventHandler());
deleteBtn.addActionListener(new EventHandler());
displayBtn.addActionListener(new EventHandler());
displayOneBtn.addActionListener(new EventHandler());
hideBtn.addActionListener(new EventHandler());
clearBtn.addActionListener(new EventHandler());
}//end constructor
private class EventHandler implements ActionListener
{
public void actionPerformed(ActionEvent ev)
{
if (ev.getSource() == insertBtn)
{
input = idFld.getText();
idInput = Integer.parseInt(input);
input = priceFld.getText();
priceInput = Double.parseDouble(input);
input = numInStockFld.getText();
numInStockInput = Integer.parseInt(input);
input = codeFld.getText();
codeInput = Integer.parseInt(input);
insert(idInput, priceInput, numInStockInput,
codeInput);
if (responseCode == 0)
{
messagesFld.setText("Array is full. Cannot insert book ID: " +
idInput);
}
else if (responseCode == 1)
{
messagesFld.setText("Succesful insertion of " + idInput);
}
else if (responseCode == -1)
{
messagesFld.setText("Duplicate ID: " + idInput);
}
}
else if (ev.getSource() == deleteBtn)
{
input = idFld.getText();
idInput = Integer.parseInt(input);
delete(idInput);
if (responseCode == 1)
{
messagesFld.setText("Successful delete of book ID: " +
idInput);
}
else if (responseCode == -1)
{
messagesFld.setText("ID: " + idInput + " not found.");
}
}
else if (ev.getSource() == displayBtn)
{
for (index = 0; index < bookArray.length; index++)
{
bookArray[index].display();
}
}
else if (ev.getSource() == displayOneBtn)
{
input = idFld.getText();
idInput = Integer.parseInt(input);
for (index = 0; index < bookArray.length; index++)
{
if (bookArray[index].getID() == idInput)
{
bookArray[index].getID();
bookArray[index].getPrice();
bookArray[index].getNumberInStock();
bookArray[index].getCode();
messagesFld.setText("id: " + bookArray[index].getID() +
" Price: " + bookArray[index].getPrice() +
" Number In Stock: " + bookArray[index].getNumberInStock() +
" Code: " + bookArray[index].getCode());
}
}
}
else if (ev.getSource() == hideBtn)
{
}
else if (ev.getSource() == clearBtn)
{
idFld.setText("");
priceFld.setText("");
numInStockFld.setText("");
codeFld.setText("");
messagesFld.setText("");
repaint();
}
}//End actionPerformed
}//End handler
//insert method, called when insert button is pressed
public int insert(int iD, double prc, int numInStock, int code)
{
if (numItems == 10)
{
System.out.println("\nThe Array is full, please delete an entry");
responseCode = 0;
return responseCode;
}
for (index = 0; index < bookArray.length; index++)
{
if (bookArray[index].getID() == iD)
{
System.out.println("\nThat ID already exists");
responseCode = -1;
return responseCode;
}
else if (bookArray[index].getID() == 0)
{
bookArray[index] = new BOOKItem(iD, prc, numInStock, code);
numItems++;
System.out.println("\n" + idInput + "\n" + priceInput + "\n" +
numInStockInput + "\n" + codeInput + "\n" + index);
System.out.println("\nID: " + bookArray[index].getID());
System.out.println("Price: " + bookArray[index].getPrice());
System.out.println("NIS: " + bookArray[index].getNumberInStock());
System.out.println("Code: " + bookArray[index].getCode());
System.out.println("Items in Array: " + numItems);
responseCode = 1;
return responseCode;
}
}
return responseCode;
}//end insert method
//Delete method, called when delete button is pressed
public int delete(int id)
{
for (index = 0; index < bookArray.length; index++)
{
if (bookArray[index].getID() == id)
{
bookArray[index].setID(0);
bookArray[index].setPrice(0);
bookArray[index].setStock(0);
bookArray[index].setCode(0);
numItems--;
System.out.println("\nSuccessful deletion");
responseCode = 1;
return responseCode;
}
}
responseCode = -1;
return responseCode;
}//end delete method
}//end app
答案 0 :(得分：5)
在“隐藏”按钮的ActionListener中，基本代码为：
JButton button = (JButton)e.getSource();
Window window = SwingUtilities.windowForComponent( button );
JFrame frame = (JFrame)window;
frame.setState(JFrame.ICONIFIED);
这样，您不依赖于标识帧的任何实例变量。使用事件的源对象是使您的侦听器具有通用性和灵活性的好方法。
答案 1 :(得分：1)
你可以使用一个按钮监听器来简单地设置框架的可见性为假：
button.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
frame.setVisible(false);
}
});
如果要图标化JFrame：
最小化frame.setState(Frame.ICONIFIED)
使用frame.setState(Frame.NORMAL)
答案 2 :(得分：0)
在EventHandler嵌套类中，尝试类似
的内容Project9.this.setState(JFrame.ICONIFIED);