2024年java列表框创建基础

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列表框JList

JList常用方法

方法作用public JList(ListModel dataModel)根据ListModel构造JListpublic JList(Object[] listData)根据对象数组构造JListpublic JList(Vector<?> listData)根据一个Vector构造JListpublic void setSelectionMode(int selectionMode)设置选择模式，是多选还是单选public ListModel getModel()返回列表框的列表模型public int[] getSelectedIndices()返回所选择的全部数组

可以通过ListSelectionModel接口完成列表框是多选还是单选

ListSelectionModel定义的常量

常量作用static final int MULTIPLE_INTERVAL_SELECTION一次选择一个或多个连续的索引范围static final int SINGLE_INTERVAL_SELECTION一次选择一个连续范围的值static final int SINGLE_SELECTION一次选择一个值

 import javax.swing.*; import java.awt.*; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.util.Vector; class MyList{ private JFrame frame = new JFrame("一"); private Container cont = frame.getContentPane(); private JList list1 = null; private JList list2 = null; public MyList(){ this.frame.setLayout(new GridLayout(1,3)); String n[] = {"A","B","C","D","E","F"}; Vector<String> v = new Vector<String>(); v.add("A"); v.add("B"); v.add("C"); this.list1 = new JList(n); this.list2 = new JList(v); list1.setBorder(BorderFactory.createTitledBorder("请选择")); list2.setBorder(BorderFactory.createTitledBorder("请选择")); list1.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION); list2.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); cont.add(this.list1); cont.add(this.list2); this.frame.setSize(300,200); this.frame.setVisible(true); this.frame.addWindowListener(new WindowAdapter() { @Override public void windowClosing(WindowEvent e) { super.windowClosing(e); System.exit(1); } }); } } public class Hello { public static void main(String[] args) { new MyList(); } }

讯享网

第一个JList通过字符串数组设置列表的内容，并通过setSelectionMode()方法设置一次性可以选择多个选项

第二个JList通过Vector设置列表的内容，并通过setSelectionMode()方法将其设置成每次只能选择一个选项

使用ListModel构造JList

ListModel是一个专门用于创建JList列表内容操作的接口

方法作用void addListDataListener(ListDataListener l)加入数据改变事件的监听void removeListDataListener(ListDataListener l)加入数据删除时的监听Object getElementAt(int index)返回指定索引处的内容int getSize()返回列表长度

讯享网 import javax.swing.*; import java.awt.*; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; class MyListModel extends AbstractListModel{ private String n[]={"A","B","C","D"}; @Override public int getSize() { return this.n.length; } public Object getElementAt(int ind){ if(ind<this.n.length){ return this.n[ind]; }else { return null; } } } class MyList{ private JFrame frame = new JFrame("一"); private Container cont = frame.getContentPane(); private JList list1 =null; public MyList(){ this.list1 = new JList(new MyListModel()); list1.setBorder(BorderFactory.createTitledBorder("请选择")); list1.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION); cont.add(this.list1); this.frame.setSize(300,200); this.frame.setVisible(true); this.frame.addWindowListener(new WindowAdapter() { @Override public void windowClosing(WindowEvent e) { super.windowClosing(e); System.exit(1); } }); } } public class Hello { public static void main(String[] args) { new MyList(); } }

JList事件处理

使用ListSelectionListener的监听接口实现对JList中所选项的监听

ListSelectionListener接口定义的方法

方法作用void valueChanged(ListSelectionEvent e)当值发生改变时调用

ListSelectionEvent的常用方法

方法作用public int getFirsIndex()返回选择的第1个选项的索引值public int getLastIndex()返回选择的最后1个选项的索引值

对JList进行监听

 import javax.swing.*; import javax.swing.event.ListSelectionEvent; import javax.swing.event.ListSelectionListener; import java.awt.*; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; class MyListModel extends AbstractListModel{ private String n[]={"A","B","C","D"}; @Override public int getSize() { return this.n.length; } public Object getElementAt(int ind){ if(ind<this.n.length){ return this.n[ind]; }else { return null; } } } class MyList implements ListSelectionListener { private JFrame frame = new JFrame("一"); private Container cont = frame.getContentPane(); private JList list1 =null; public MyList(){ this.list1 = new JList(new MyListModel()); java列表框创建基础 list1.setBorder(BorderFactory.createTitledBorder("请选择")); list1.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION); list1.addListSelectionListener(this); cont.add(this.list1); this.frame.setSize(300,200); this.frame.setVisible(true); this.frame.addWindowListener(new WindowAdapter() { @Override public void windowClosing(WindowEvent e) { super.windowClosing(e); System.exit(1); } }); } @Override public void valueChanged(ListSelectionEvent e) { int temp[] = list1.getSelectedIndices(); System.out.print("选的的内容是："); for(int i:temp){ System.out.print(list1.getModel().getElementAt(i)+","); } System.out.println(); } } public class Hello { public static void main(String[] args) { new MyList(); } }

2024年java列表框创建基础

目录

列表框JList

使用ListModel构造JList

JList事件处理

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