Java JList-选择多个项目
我在Java JList-选择多个项目,java,swing,netbeans,jlist,multi-select,Java,Swing,Netbeans,Jlist,Multi Select,我在JList中遇到了这个setSelectedValue()方法的问题,当我想在JList中自动选择多个值时,它仍然只选择了一个。有办法吗 String[] items = { "Item 1", "Item 2", "Item 3", "Item 4" }; final JList theList = new JList(items); theList.setSelectedValue("Item 1",true); theList.setSelecte
JList
中遇到了这个setSelectedValue()
方法的问题,当我想在JList
中自动选择多个值时,它仍然只选择了一个。有办法吗
String[] items = { "Item 1", "Item 2", "Item 3", "Item 4" };
final JList theList = new JList(items);
theList.setSelectedValue("Item 1",true);
theList.setSelectedValue("Item 2",true);
此代码仅显示所选的项目2
list.getSelectionModel().setSelectionInterval(...);
或者,如果选择不是连续的,则需要使用多个
list.getSelectionModel().addSelectionInterval(...);
调用
JList.setSelectionMode(ListSelectionModel.MULTIPLE\u INTERVAL\u SELECTION)后,使用JList.setselectedDices(int[])
例如。
import javax.swing.*;
导入java.io.*;
导入java.util.ArrayList;
类多选列表{
公共静态void main(字符串[]args)引发异常{
文件f=新文件(“MultiSelectList.java”);
InputStream is=新文件InputStream(f);
InputStreamReader isr=新的InputStreamReader(is);
BufferedReader br=新的BufferedReader(isr);
最终ArrayList行=新ArrayList();
String line=br.readLine();
while(行!=null){
行。添加(行);
line=br.readLine();
}
SwingUtilities.invokeLater(新的Runnable(){
公开募捐{
JList list=新的JList(lines.toArray());
list.setSelectionMode(
ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
int[]select={19,20,22};
列表。设置选定的骰子(选择);
showMessageDialog(null,新的JScrollPane(列表));
}
});
}
}
截屏
使用NetBeans GUI编辑器时,您可以自定义为JList
生成的创建后代码,如下所示
import javax.swing.*;
import java.io.*;
import java.util.ArrayList;
class MultiSelectList {
public static void main(String[] args) throws Exception {
File f = new File("MultiSelectList.java");
InputStream is = new FileInputStream(f);
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
final ArrayList<String> lines = new ArrayList<String>();
String line = br.readLine();
while (line!=null) {
lines.add(line);
line = br.readLine();
}
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JList list = new JList(lines.toArray());
list.setSelectionMode(
ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
int[] select = {19, 20, 22};
list.setSelectedIndices(select);
JOptionPane.showMessageDialog(null, new JScrollPane(list));
}
});
}
}
导入javax.swing.*;
导入java.io.*;
导入java.util.ArrayList;
类多选列表{
公共静态void main(字符串[]args)引发异常{
文件f=新文件(“MultiSelectList.java”);
InputStream is=新文件InputStream(f);
InputStreamReader isr=新的InputStreamReader(is);
BufferedReader br=新的BufferedReader(isr);
最终ArrayList行=新ArrayList();
String line=br.readLine();
while(行!=null){
行。添加(行);
line=br.readLine();
}
SwingUtilities.invokeLater(新的Runnable(){
公开募捐{
JList list=新的JList(lines.toArray());
list.setSelectionMode(
ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
int[]select={19,20,22};
列表。设置选定的骰子(选择);
showMessageDialog(null,新的JScrollPane(列表));
}
});
}
}
是的,这是正确的,但我需要根据值而不是索引来选择它们。你对此有什么想法吗?@Nirav遵循本Java Swing教程和大量的示例+1@Nirav:作为练习,将@Andrew Thompson的示例与生成的代码进行比较。现在的问题是,每次第一项都显示为选中。否则它可以正常工作。@Nirav:正确,还必须添加对setSelectedDices()
的调用,如@Andrew Thompson所示。
import javax.swing.*;
import java.io.*;
import java.util.ArrayList;
class MultiSelectList {
public static void main(String[] args) throws Exception {
File f = new File("MultiSelectList.java");
InputStream is = new FileInputStream(f);
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
final ArrayList<String> lines = new ArrayList<String>();
String line = br.readLine();
while (line!=null) {
lines.add(line);
line = br.readLine();
}
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JList list = new JList(lines.toArray());
list.setSelectionMode(
ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
int[] select = {19, 20, 22};
list.setSelectedIndices(select);
JOptionPane.showMessageDialog(null, new JScrollPane(list));
}
});
}
}