我相信它非常簡單,但這是我的第一個Java類。用戶在輸入Jtextfield中輸入一個數字。 Add按鈕應該將該數字添加到數組列表中。我很難弄清楚如何做到這一點。任何幫助,您可以給我將是真棒將數字添加到Jtextfield的數組列表中
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
public class ArrayExercise extends JFrame
{
private final int WINDOW_WIDTH = 300;
private final int WINDOW_HEIGHT = 300;
private JPanel panel1;
private JPanel panel2;
private JLabel messageLabel;
private JTextField input;
private JTextArea output;
private JButton addButton;
private JButton list;
private JButton rlist;
private JButton clear;
public ArrayExercise()
{
setTitle("Array Exercise");
setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new BorderLayout());
panel1();
panel2();
add(panel1, BorderLayout.EAST);
add(panel2, BorderLayout.WEST);
setVisible(true);
input.requestFocus();
}
private void panel1()
{
messageLabel = new JLabel("Input");
input = new JTextField(5);
addButton = new JButton("Add");
list = new JButton("List");
rlist = new JButton("R-List");
clear = new JButton("Clear");
addButton.addActionListener(new ButtonListener());
list.addActionListener(new ButtonListener());
rlist.addActionListener(new ButtonListener());
clear.addActionListener(new ButtonListener());
panel1 = new JPanel();
panel1.setLayout(new GridLayout(6,1));
panel1.add(messageLabel);
panel1.add(input);
panel1.add(addButton);
panel1.add(list);
panel1.add(rlist);
panel1.add(clear);
}
private void panel2()
{
output = new JTextArea(12, 10);
panel2 = new JPanel();
panel2.add(output);
}
private class ButtonListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
String in;
int number;
int index = 0;
ArrayList<String> list = new ArrayList<>();
String actionCommand = e.getActionCommand();
if (actionCommand.equals("Add"))
{
index++;
in = addButton.getText();
list.add(addButton.getText());
if (index == 9)
{
input.setEditable(false);
addButton.setEnabled(false);
}
output.setText(in + " added.");
input.setText(null);
input.requestFocus();
}
if (actionCommand.equals("List"))
{
for(int x = 0; x <= list.size(); x++)
{
output.setText((x+1)+ ". " + list.get(x) + "\n");
}
}
}
}
public static void main(String[] args)
{
new ArrayExercise();
}
}
你有沒有嘗試調試的代碼,並找出問題? – Smit
是的,我試過了,但就像我說這是我的第一個Java類,所以我不會那麼做。 –