到目前为止我的代码:
import java.awt.BorderLayout;
import java.awt.Container;
import javax.swing.Box;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
public class TestFile2 {
public static void main(String args[]) {
String size[] = {"Small", "Medium", "Large", "Extra Large"};
String toppings[] = {"Cheese", "Pepperoni", "Sausage", "Spinach", "Pepperoncini"};
JFrame f = new JFrame("Pizza");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JList list1 = new JList(size);
JList list2 = new JList(toppings);
Container c = f.getContentPane();
JScrollPane sp1 = new JScrollPane(list1);
sp1.setColumnHeaderView(new JLabel("Select Size"));
JScrollPane sp2 = new JScrollPane(list2);
sp2.setColumnHeaderView(new JLabel("Select Toppings. Hold Ctrl to select multiple toppings"));
Box box = Box.createHorizontalBox();
box.add(sp1);
box.add(sp2);
list1.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
JList jListSource = (JList) e.getSource();
Object[] selection = jListSource.getSelectedValues();
if (!e.getValueIsAdjusting()) {
System.out.println("----");
for (int i = 0; i < selection.length; i++) {
double costSize;
if (selection[i].equals("Small")) {
costSize = 7.00;
} else if (selection[i].equals("Medium")) {
costSize = 9.00;
} else if (selection[i].equals("Large")) {
costSize = 11.00;
} else {
costSize = 14.00;
}
System.out.println("selection = " + selection[i]);
System.out.println("selection = " + costSize);
}
}
}
});
c.add(box, BorderLayout.CENTER);
f.setSize(
300, 200);
f.setVisible(
true);
}
}
我需要做类似于我对list1所做的事情。
我需要让用户从JList中选择比萨饼和浇头的大小。最后,我需要能够计算总成本。每个顶部是1美元。在某个方向上的任何一点都会受到高度赞赏,因为在过去的几个小时里我一直在试着解决这个问题。
提前致谢。
答案 0 :(得分:2)
我希望这会有所帮助:) ...还有其他方法可以做到......这只是其中之一......
import java.awt.BorderLayout;
import java.awt.Container;
import javax.swing.Box;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
public class TestFile2 {
private static JList list1;
private static JList list2;
public static void main(String args[]) {
String size[] = {"Small", "Medium", "Large", "Extra Large"};
String toppings[] = {"Cheese", "Pepperoni", "Sausage", "Spinach", "Pepperoncini"};
JFrame f = new JFrame("Pizza");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
list1 = new JList(size);
list2 = new JList(toppings);
Container c = f.getContentPane();
JScrollPane sp1 = new JScrollPane(list1);
sp1.setColumnHeaderView(new JLabel("Select Size"));
JScrollPane sp2 = new JScrollPane(list2);
sp2.setColumnHeaderView(new JLabel("Select Toppings. Hold Ctrl to select multiple toppings"));
Box box = Box.createHorizontalBox();
box.add(sp1);
box.add(sp2);
list1.addListSelectionListener(new ListSelectionListener()
{
public void valueChanged(ListSelectionEvent e)
{
handleEvent(e);
}
});
list2.addListSelectionListener(new ListSelectionListener()
{
public void valueChanged(ListSelectionEvent e)
{
handleEvent(e);
}
});
c.add(box, BorderLayout.CENTER);
f.setSize(
300, 200);
f.setVisible(
true);
}
protected static void handleEvent(ListSelectionEvent e)
{
double cost = 0.0;
Object[] selection = list1.getSelectedValues();
Object[] toppings = list2.getSelectedValues();
if(toppings.length == 0)
System.out.println("Please select a topping");
if(selection.length == 0)
System.out.println("Please select a size");
if (!e.getValueIsAdjusting())
{
System.out.println("----");
for (int i = 0; i < selection.length; i++)
{
double costSize;
if (selection[i].equals("Small")) {
cost = 7.00;
} else if (selection[i].equals("Medium")) {
cost = 9.00;
} else if (selection[i].equals("Large")) {
cost = 11.00;
} else {
cost = 14.00;
}
}
for (int i = 0; i < toppings.length; i++)
{
cost++;
}
System.out.println("Total = " + cost);
}
}
}