小编Dia*_*son的帖子

我无法将页脚放在页面底部.这是我的代码

footer {
background-color: #FFF;
position:fixed;
bottom: 0px;
width: 400px;
text-align: center;
}
<footer align="center">
    <p>March 25, 2</p>
</footer>

我的程序编译并运行,但这是我的问题.我为每个项目设置了一个复选框,但我只需要它来检查已检查的项目而不是所有项目.相反,它总计所有项目,无论它们是否被检查.

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JCheckBox;
import javax.swing.JPanel;
import javax.swing.JTextField;
import java.awt.GridLayout;
import java.text.*;

public class StudentShopping extends JFrame
{
    public static void main(String[] args) {

        JFrame frame = new JFrame();

        frame.setSize(550, 400); //Sets size of the window
        frame.setTitle("Student Shopping");//Adds title to the GUI
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JCheckBox ClothingCheckBox = new JCheckBox();
        JLabel Clothinglbl = new JLabel("Clothing");
        final JTextField ClothingField = new JTextField(3);
        ClothingField.setText("0");

        JCheckBox BooksCheckBox = new JCheckBox(); 
        JLabel Bookslbl = new JLabel("Books");
        final …