Java 入门图形用户界面设计之列表框JList

Java 入门图形用户界面设计之列表框JList

目录列表框JList使用ListModel构造JListJList事件处理

java程序设计 图形用户界面 【十一】列表框JList

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 v = new Vector();

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();

}

}

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

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

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

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());

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.fraELCKgonTtNme.setVisible(true);

this.frame.addWindowListener(new WindowAdapter() {

@ELCKgonTtNOverride

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();

}

}

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

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());

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.fraELCKgonTtNme.setVisible(true);

this.frame.addWindowListener(new WindowAdapter() {

@ELCKgonTtNOverride

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();

}

}

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());

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.fraELCKgonTtNme.setVisible(true);

this.frame.addWindowListener(new WindowAdapter() {

@ELCKgonTtNOverride

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();

}

}

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