我目前已经创建了一个多间隔选择 JList,并且我希望能够对选择进行一些操作。目前,我的代码只能创建一个 JList,我可以在其中“突出显示”选定的对象;但是,我想要做的是将选定的对象放入 Array 或 ArrayList 中,以便我可以对这些对象执行一些操作。我在网上搜索并找到了 getSelectedValueList() ,但我真的不知道如何使用和访问它以供以后使用。
我的另一个问题是,我正在考虑创建一个名为“Submit”的 JButton,但我想知道我应该如何处理带有 JList 的窗口。我应该让它在按下按钮后退出吗?
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.util.List;
public class ClassSelection extends JFrame {
private JList classList;
private String[] classNames = {"Programming Foundations I",
"Programming Foundations II",
"Digital Design", "Computer Organization", "Programming
Paradigms",
"Honors Programming Paradigms", "Cluster Computing",
"Software Engineering"};
public ClassSelection() {
super("Classes Taken:");
Container container = getContentPane();
container.setLayout(new FlowLayout());
classList = new JList(classNames);
classList.setVisibleRowCount(5);
classList.setFixedCellHeight(45);
classList.setFixedCellWidth(450);
classList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTIO N);
container.add(new JScrollPane(classList));
setSize(600, 600);
setVisible(true);
}
public static void main(String[] args) {
ClassSelection application = new ClassSelection();
}
}
最佳答案
请参阅下面的我的代码。它包含您的要求。
第二个问题的代码正如你所说。
"Should I make it exit after the button is pressed?"
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.List;
public class ClassSelection extends JFrame {
private JList classList;
private String[] classNames = {"Programming Foundations I",
"Programming Foundations II",
"Digital Design", "Computer Organization", "Programming Paradigms",
"Honors Programming Paradigms", "Cluster Computing",
"Software Engineering"};
public ClassSelection() {
super("Classes Taken:");
Container container = getContentPane();
container.setLayout(new FlowLayout());
classList = new JList(classNames);
classList.setVisibleRowCount(5);
classList.setFixedCellHeight(45);
classList.setFixedCellWidth(450);
classList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
JScrollPane jScrollPane = new JScrollPane(classList);
// First question
List<String> myList = new ArrayList<>();
classList.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
super.mouseClicked(e);
JList jList = (JList) e.getSource();
String className = (String) jList.getSelectedValue();
myList.add(className);
System.out.println("clicked : " + className);
// you can see the items being appended
System.out.println("list : " + myList.toString());
}
});
// Second question
JButton btn = new JButton("Submit");
btn.addActionListener(event -> {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
dispose();
});
container.add(jScrollPane);
container.add(btn);
setSize(600, 600);
setVisible(true);
}
public static void main(String[] args) {
ClassSelection application = new ClassSelection();
application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
关于java - 如何使用列表中选定的值?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54694908/