在 Java Swing GUI 中显示和操作 ArrayList
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时间：2020-11-02 15:57:49 来源:igfitidea点击:
Displaying and manipulating ArrayList in Java Swing GUI
提问by Charly Bear
This is a GUI with Arraylistin Java. I'm trying to display the ArrayListin a nice arrangement on the center panel. It would be nice to see the entire list! What code would I have to add to make the current to a JList and display correctly. Also how do I add to the ArrayListfrom the input and add button at the top of GUI. Any ideas on what code would achieve this end?
这是一个带有Arraylistin的 GUI Java。我正在尝试ArrayList在中央面板上以漂亮的排列方式显示。很高兴看到整个列表！我必须添加哪些代码才能将当前代码添加到 JList 并正确显示。另外我如何ArrayList从输入添加到 GUI 顶部的添加按钮。关于什么代码可以实现这一目标的任何想法？
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.JScrollPane;
import java.util.ArrayList;
import java.util.Collections;
public class ArrayListGUI extends JPanel
{
// main method; runs application and sets up the JFrame
public static void main(String[] args)
{
JFrame frame = new JFrame("ArrayList");
ArrayListGUI content = new ArrayListGUI();
frame.setContentPane(content);
frame.pack();
frame.setResizable(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(800,690);
frame.setLocation(75,50);
frame.setVisible(true);
}
// declare variables
private JList message;
private Action messageAction;
private JButton removeAll, printL, saveF, quitA; //west
private JButton az, za, rev, random; // east
private JTextField inputBox;
private JButton addButton;
private JTextField sizeBox; // bottom
//-------------------------------------------------------------------------------------------
public ArrayListGUI()
{
ArrayList<String> wordlist = new ArrayList<String>();
// wordlist ArrayList has been created, now we add words to that list...
// (data set from the Word Association Test - Carl Jung)
wordlist.add("Head");
wordlist.add("Green");
wordlist.add("Water");
wordlist.add("To sing");
wordlist.add("Dead");
wordlist.add("Long");
wordlist.add("Ship");
wordlist.add("To pay");
wordlist.add("Window");
wordlist.add("Friendly");
wordlist.add("To cook");
wordlist.add("To ask");
wordlist.add("Cold");
wordlist.add("Stem");
wordlist.add("To dance");
wordlist.add("Village");
wordlist.add("Lake");
wordlist.add("Sick");
wordlist.add("Pride");
wordlist.add("To Cook"); // this item 20 in the word array
wordlist.add("Ink");
wordlist.add("Angry");
wordlist.add("Needle");
wordlist.add("To swim");
wordlist.add("Voyage");
wordlist.add("Blue");
wordlist.add("Lamp");
wordlist.add("To sin");
wordlist.add("Bread");
wordlist.add("Rich");
wordlist.add("Tree");
wordlist.add("To prick");
wordlist.add("Pity");
wordlist.add("Yellow");
wordlist.add("Mountain");
wordlist.add("To die");
wordlist.add("Salt");
wordlist.add("New");
wordlist.add("Custom");
wordlist.add("To pray"); // this item 40 in the word array
wordlist.add("Money");
wordlist.add("Foolish");
wordlist.add("Pamphlet");
wordlist.add("Despise");
wordlist.add("Finger");
wordlist.add("Expensive");
wordlist.add("Bird");
wordlist.add("To fall");
wordlist.add("Book");
wordlist.add("Unjust");
wordlist.add("Frog");
wordlist.add("To part");
wordlist.add("Hunger");
wordlist.add("White");
wordlist.add("Child");
wordlist.add("To take care");
wordlist.add("Lead pencil");
wordlist.add("Sad");
wordlist.add("Plum");
wordlist.add("To marry"); // this item 60 in the word array
wordlist.add("House");
wordlist.add("Dear");
wordlist.add("Glass");
wordlist.add("To quarrel");
wordlist.add("Fur");
wordlist.add("Big");
wordlist.add("Carrot");
wordlist.add("To paint");
wordlist.add("Part");
wordlist.add("Old");
wordlist.add("Flower");
wordlist.add("To beat");
wordlist.add("Box");
wordlist.add("Wild");
wordlist.add("Family");
wordlist.add("To wash");
wordlist.add("Cow");
wordlist.add("Friend");
wordlist.add("Luck");
wordlist.add("Lie"); // this item 80 in the word array
wordlist.add("Deportment");
wordlist.add("Narrow");
wordlist.add("Brother");
wordlist.add("To fear");
wordlist.add("Stork");
wordlist.add("False");
wordlist.add("Anxiety");
wordlist.add("To kiss");
wordlist.add("Bride");
wordlist.add("Pure");
wordlist.add("Door");
wordlist.add("To choose");
wordlist.add("Hay");
wordlist.add("Contented");
wordlist.add("Ridicule");
wordlist.add("To sleep");
wordlist.add("Month");
wordlist.add("Nice");
wordlist.add("Woman");
wordlist.add("To abuse"); // Phew! this item 100 in the word array
// Word list array is now populated with the basic data
//------------------------------------------------------------------------------------------------
//-----------------------------------------------------------------------------------------
// ArrayList actions outline, code/logic to mange the list. It is outputted to console for test purposes.
// next section outputs formatted list of words
System.out.println("Contents of the ArrayList of words:");
for(String str: wordlist)
{
System.out.println(str);
}
// end output formatted list
// this section performs and displays the shuffle operation
Collections.shuffle(wordlist);
System.out.println("Results after shuffle operation:");
for(String str: wordlist)
{
System.out.println(str);
}
// end shuffle section
// prints an unformatted list of words in the ArrayList
System.out.println(wordlist);
// this queries if the wordlist is populated. Returns true if empty. Returns false if populated
System.out.println("Is ArrayList empty? "+ wordlist.isEmpty());
// finds and prints the index of a given word in the list, in this case 'ship'
System.out.println("Index of Ship is "+ wordlist.indexOf("Ship"));
// finds the size of the ArrayList and prints to screen
System.out.println("Size of the ArrayList is: "+ wordlist.size());
// end ArrayList actions design outline
//-----------------------------------------------------------------------------------------
//-----------------------------------------------------------------------------------------
// create an introduction message
String begin ="Welcome! \n\n Press OK to begin the ArrayList GUI demo";
JOptionPane.showMessageDialog( null, begin );
// section for main MESSAGE
JList <String> message = new JList<>(wordlist.toArray(new String[0]));
//message.setOpaque(true);
JScrollPane scrollPane = new JScrollPane(message);
add(scrollPane, BorderLayout.CENTER);
//-----------------------------------------------------------------end message
// section for bottom panel
// call wordlist -- find if empty or not, display current size, and find index of sample word --
sizeBox = new JTextField(" Is ArrayList empty? "+ wordlist.isEmpty() +
" Current size of list = "+ wordlist.size() +
" Index of the example word 'Ship' is "+ wordlist.indexOf("Ship"),
JTextField.CENTER);
sizeBox.setEditable(false); // ensures that the list text cannot be edited in the panel
sizeBox.setOpaque(true);
sizeBox.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
sizeBox.setFont( new Font("Serif", Font.BOLD, 14) );
//------------------------------------------------------------------------------end bottom
// west panel
ActionListener westListener = new ActionListener()
{
public void actionPerformed(ActionEvent evt)
{
switch ( evt.getActionCommand() )
{
case "Remove all items":
System.out.println("Remove all");// demonstrates actionlistener is working
break;
case "Print List":
System.out.println("Print List");
break;
case "Save to file":
System.out.println("Save file");
break;
case "Quit application":
System.out.println("Quit");
break;
}
}
};
// create buttons for west panel
ButtonGroup westGroup = new ButtonGroup();
removeAll = new JButton("Remove all items");
westGroup.add(removeAll);
removeAll.addActionListener(westListener);
printL = new JButton("Print List");
westGroup.add(printL);
printL.addActionListener(westListener);
saveF = new JButton("Save to file");
westGroup.add(saveF);
saveF.addActionListener(westListener);
quitA = new JButton("Quit application");
westGroup.add(quitA);
quitA.addActionListener(westListener);
// ----------------------------------------------------------- end west
// create input box
inputBox = new JTextField("", JTextField.CENTER);
inputBox.setEditable(true); // ensures that the list text cannot be edited in the panel
inputBox.setOpaque(true);
inputBox.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
inputBox.setFont( new Font("Serif", Font.BOLD, 22) );
inputBox.setForeground(Color.WHITE);
inputBox.setBackground(Color.BLACK);
// create add button
addButton = new JButton("Add to List");
//addButtonListener to take input from word add box and include in ArrayList
addButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
System.out.println("Add item to list");
wordlist.add(inputBox.getText() + ", "); // append the input to the list
}
});
// ------------------------------------------------- end input box
// start east
ActionListener eastListener = new ActionListener()
{
public void actionPerformed(ActionEvent evt2)
{
switch ( evt2.getActionCommand() )
{
case "A to Z":
System.out.println("A to Z");
break;
case "Z to A":
System.out.println("Z to A");
break;
case "Reverse order":
System.out.println("Reverse order");
break;
case "Random order":
System.out.println("Random order");
Collections.shuffle(wordlist);
break;
}
}
};
// create EAST buttons
ButtonGroup eastGroup = new ButtonGroup();
az = new JButton("A to Z");
eastGroup.add(az);
az.addActionListener(eastListener);
za = new JButton("Z to A");
eastGroup.add(za);
za.addActionListener(eastListener);
rev = new JButton("Reverse order");
eastGroup.add(rev);
rev.addActionListener(eastListener);
random = new JButton("Random order");
eastGroup.add(random);
random.addActionListener(eastListener);
// end east
//--------------------------------------------------------------------------------------------------------
// arrange the GUI with 4 panels
// the current ArrayList will be displayed in the center.
setBorder(BorderFactory.createEmptyBorder(15,15,15,15));
JPanel left = new JPanel();
JPanel right = new JPanel();
JPanel center = new JPanel();
JPanel top = new JPanel();
JPanel bottom = new JPanel();
// create border layout and populate
setLayout(new BorderLayout(5,5));
add(left, BorderLayout.WEST);
add(right, BorderLayout.EAST);
add(center, BorderLayout.CENTER);
add(bottom, BorderLayout.SOUTH);
// place series of grid layouts inside the border layout components
left.setLayout(new GridLayout(4,1));
right.setLayout(new GridLayout(4,1));
center.setLayout(new BorderLayout(5,5));
center.add(message,BorderLayout.CENTER);
center.add(top,BorderLayout.NORTH);
top.setLayout(new GridLayout(1,2,5,5));
bottom.setLayout(new GridLayout(1,2,5,5));
// west panel
left.add(removeAll);
left.add(printL);
left.add(saveF);
left.add(quitA);
// east panel
right.add(az);
right.add(za);
right.add(rev);
right.add(random);
// top and bottom panel
top.add(inputBox);
top.add(addButton);
bottom.add(sizeBox);
} // constructor ends
} // THE END ArrayListGUI
回答by user1803551
You can convert your ArrayListto an array which will be used to initialize the JList.
您可以将您的转换ArrayList为一个数组，该数组将用于初始化JList.
public class Listing extends JFrame {
public static void main(String[] args) {
new Listing();
}
Listing() {
final ArrayList<String> wordlist = new ArrayList<String>();
wordlist.add("Head");
wordlist.add("Green");
wordlist.add("Water");
wordlist.add("To sing");
wordlist.add("Dead");
wordlist.add("Long");
wordlist.add("Ship");
wordlist.add("To pay");
wordlist.add("Window");
wordlist.add("Friendly");
wordlist.add("To cook");
JList<String> displayList = new JList<>(wordlist.toArray(new String[0]));
JScrollPane scrollPane = new JScrollPane(displayList);
getContentPane().add(scrollPane);
setDefaultCloseOperation(EXIT_ON_CLOSE);
pack();
setVisible(true);
}
}
