Java——下拉列表框，复选框，列表框，文件选择框

 

import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Vector;

import javax.swing.BorderFactory;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;

class MyComboBox{
	private JFrame frame = new JFrame("窗体");					//定义窗体
	private Container cont = frame.getContentPane();			//得到窗体容器
	private JComboBox jcb1  = null;											//定义下拉列表框
	private JComboBox jcb2  = null;											//定义下拉列表框
	public MyComboBox(){
		this.frame.setLayout(new GridLayout(2,2));
		String nations[] = {"中国","美国","韩国","法国","英国"};
		Vector<String> v = new Vector<String>();						//定义一个Vector集合
		v.add("元素1");
		v.add("元素2");
		v.add("元素3");
		this.jcb1 = new JComboBox(nations);
		this.jcb2 = new JComboBox(v);
		//定义一个列表框的边框显示条
		jcb1.setBorder(BorderFactory.createTitledBorder("哪个国家？"));
		jcb2.setBorder(BorderFactory.createTitledBorder("Vector?"));
		jcb1.setMaximumRowCount(3);				//最多显示3个选项
		jcb2.setMaximumRowCount(3);
		cont.add(this.jcb1);
		cont.add(this.jcb2);
		cont.add(new JLabel("下拉列表框"));
		this.frame.setSize(330,200);
		this.frame.setVisible(true);
		this.frame.addWindowListener(new WindowAdapter(){	//加入事件监听
			public void windowClosing(WindowEvent arg0) {			//窗口关闭时触发，按下关闭按钮
			// TODO 自动生成的方法存根
			System.out.println("windowClosing-->窗口关闭");
			System.exit(1);
			}
		});
	}
}


//主类
//Function        : 	MyComboBox_demo
public class MyComboBox_demo {

	public static void main(String[] args) {
		// TODO 自动生成的方法存根
		new MyComboBox();
	}

}

 

import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Vector;

import javax.swing.AbstractListModel;
import javax.swing.BorderFactory;
import javax.swing.ComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;

class MyComboBoxModel extends AbstractListModel implements ComboBoxModel{
	
	String nations[] = {"中国","美国","韩国","法国","英国"};
	String item = null;
	
	@Override
	public int getSize() {
		// TODO 自动生成的方法存根
		return this.nations.length;
	}

	@Override
	public Object getElementAt(int index) {
		// TODO 自动生成的方法存根
		return this.nations[index];
	}

	@Override
	public void setSelectedItem(Object anItem) {
		// TODO 自动生成的方法存根
		this.item = (String) anItem;
	}

	@Override
	public Object getSelectedItem() {
		// TODO 自动生成的方法存根
		return this.item;
	}
	
}

class MyComboBox{
	private JFrame frame = new JFrame("窗体");					//定义窗体
	private Container cont = frame.getContentPane();			//得到窗体容器
	private JComboBox jcb1  = null;											//定义下拉列表框
	private JComboBox jcb2  = null;											//定义下拉列表框
	public MyComboBox(){
		this.frame.setLayout(new GridLayout(2,2));
//		String nations[] = {"中国","美国","韩国","法国","英国"};
//		Vector<String> v = new Vector<String>();						//定义一个Vector集合
//		v.add("元素1");
//		v.add("元素2");
//		v.add("元素3");
//		this.jcb1 = new JComboBox(nations);
//		this.jcb2 = new JComboBox(v);
		this.jcb1 = new JComboBox(new MyComboBoxModel());		//实例化JComboBox
		//定义一个列表框的边框显示条
		jcb1.setBorder(BorderFactory.createTitledBorder("哪个国家？"));
//		jcb2.setBorder(BorderFactory.createTitledBorder("Vector?"));
		jcb1.setMaximumRowCount(3);				//最多显示3个选项
//		jcb2.setMaximumRowCount(3);
		cont.add(this.jcb1);
//		cont.add(this.jcb2);
		cont.add(new JLabel("下拉列表框"));
		this.frame.setSize(330,200);
		this.frame.setVisible(true);
		this.frame.addWindowListener(new WindowAdapter(){	//加入事件监听
			public void windowClosing(WindowEvent arg0) {			//窗口关闭时触发，按下关闭按钮
			// TODO 自动生成的方法存根
			System.out.println("windowClosing-->窗口关闭");
			System.exit(1);
			}
		});
	}
}

public class MyComboBox_demo {

	public static void main(String[] args) {
		// TODO 自动生成的方法存根
		new MyComboBox();
	}

}

 

import java.awt.Container;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Vector;

import javax.swing.AbstractListModel;
import javax.swing.Action;
import javax.swing.BorderFactory;
import javax.swing.ComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;

class MyComboBox implements ItemListener,ActionListener{
	private JFrame frame = new JFrame("窗体");					//定义窗体
	private Container cont = frame.getContentPane();			//得到窗体容器
	private JComboBox jcb1  = null;											//定义下拉列表框
	private JLabel label  = new JLabel("标签");							//定义标签
	private String fontSize[] = {"10","11","12"};
	
	public MyComboBox(){
		this.frame.setLayout(new GridLayout(2,2));

		this.jcb1 = new JComboBox(this.fontSize);		//实例化JComboBox
		//定义一个列表框的边框显示条
		jcb1.setBorder(BorderFactory.createTitledBorder("请选择显示文字大小"));

		jcb1.addItemListener(this); 					//加入选项监听
		jcb1.addActionListener(this); 				//加入动作监听
		
		jcb1.setMaximumRowCount(3);				//最多显示3个选项
		jcb1.setEditable(true);								//设置可编辑文本
		jcb1.configureEditor(jcb1.getEditor(), "12"); 		//定义默认值
		this.changeFontSize(12);     					//设置默认字体

		cont.add(this.jcb1);
		cont.add(label);

		cont.add(new JLabel("下拉列表框"));
		this.frame.setSize(330,200);
		this.frame.setVisible(true);
		this.frame.addWindowListener(new WindowAdapter(){	//加入事件监听
			public void windowClosing(WindowEvent arg0) {			//窗口关闭时触发，按下关闭按钮
			// TODO 自动生成的方法存根
			System.out.println("windowClosing-->窗口关闭");
			System.exit(1);
			}
		});
	}
	@Override
	public void actionPerformed(ActionEvent e) {		//输入信息时触发
		// TODO 自动生成的方法存根
		String itemSize = (String) this.jcb1.getSelectedItem();	//得到选项
		int Size = 12;
		try{
			Size = Integer.parseInt(itemSize);		//字符串转整数
		}catch(Exception ex){
			this.jcb1.getEditor().setItem("输入的不是数字");
		}
		this.changeFontSize(Size);
		if(!this.isExists(itemSize)){
			this.jcb1.addItem(jcb1.getSelectedItem()); 		//不存在，加入下拉选项
		}
	}
	@Override
	public void itemStateChanged(ItemEvent e) {
		// TODO 自动生成的方法存根
		
	}
	
	public void changeFontSize(int size){			//改变文字大小
		Font font = new Font("Serief",Font.BOLD,size);		//定义Font对象
		this.label.setFont(font);													//设置文字大小
	}
	
	public boolean isExists(String item){
		boolean flag = false;
		for(int i =0;i<this.jcb1.getItemCount();i++){
			if(item.equals(this.jcb1.getItemAt(i))){
				flag = true;
			}
		}
		return flag;
	}
	
}

public class MyComboBox_demo {

	public static void main(String[] args) {
		// TODO 自动生成的方法存根
		new MyComboBox();
	}

}

 

 

import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;

class MyCheckBox implements ItemListener{
	private JFrame frame = new JFrame("窗体");
	private Container cont = frame.getContentPane();
	private JCheckBox jrb1  = new JCheckBox("单选1");
	private JCheckBox jrb2  = new JCheckBox("单选2"); 
	private JCheckBox jrb3  = new JCheckBox("单选3"); 
	private JPanel pan = new JPanel();
	public MyCheckBox(){
		//定义一个面板的边框显示条
		pan.setBorder(BorderFactory.createTitledBorder("请选择按钮"));
		pan.setLayout(new GridLayout(1,3));

		pan.add(this.jrb1);
		pan.add(this.jrb2);
		pan.add(this.jrb3);
		
		jrb1.addItemListener(this); 			//加入事件监听
		jrb2.addItemListener(this); 			//加入事件监听
		jrb3.addItemListener(this); 			//加入事件监听
		
		cont.add(pan);
		this.frame.setSize(330,80);
		this.frame.setVisible(true);
		this.frame.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e) {			//窗口关闭时触发，按下关闭按钮
			// TODO 自动生成的方法存根
			System.out.println("windowClosing-->窗口关闭");
			System.exit(1);
			}
		});
	}
	@Override
	public void itemStateChanged(ItemEvent e) {
		// TODO 自动生成的方法存根
		if(jrb1.isSelected()){
			System.out.println("jrb1");
		}
		if(jrb2.isSelected()){
			System.out.println("jrb2");
		}
		if(jrb3.isSelected()){
			System.out.println("jrb3");
		}
	}
}

public class JCheckBox_demo {

	public static void main(String[] args) {
		// TODO 自动生成的方法存根
		new MyCheckBox();
	}

}

 

import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Vector;

import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JRadioButton;
import javax.swing.ListSelectionModel;

class MyList{
	private JFrame frame = new JFrame("窗体");					//定义窗体
	private Container cont = frame.getContentPane();			//得到窗体容器
	private JList list1  = null;															//定义列表框
	private JList list2  = null;															//定义列表框
	public MyList(){
		this.frame.setLayout(new GridLayout(1,3));					//定义排版，1行2列
		String nations[] = {"中国","美国","韩国","法国","英国"};
		Vector<String> v = new Vector<String>();						//定义一个Vector集合
		v.add("Vector1");
		v.add("Vector2");
		v.add("Vector3");
		this.list1 = new JList(nations);					//实例化JList
		this.list2 = new JList(v);								//实例化JList
		//定义一个列表框的边框显示条
		list1.setBorder(BorderFactory.createTitledBorder("哪个国家？"));
		list2.setBorder(BorderFactory.createTitledBorder("Vector?"));
		//第一个列表框一次可以选择多个选项
		list1.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
		//第二个列表框每次可以选择一个选项
		list2.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
		cont.add(this.list1);					//加入面板
		cont.add(this.list2);					//加入面板
		this.frame.setSize(330,200);
		this.frame.setVisible(true);
		this.frame.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e) {			//窗口关闭时触发，按下关闭按钮
			// TODO 自动生成的方法存根
			System.out.println("windowClosing-->窗口关闭");
			System.exit(1);
			}
		});
	}
}

public class JList_demo {

	public static void main(String[] args) {
		// TODO 自动生成的方法存根
		new MyList();
	}

}

 

 

import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Vector;

import javax.swing.AbstractListModel;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.ListSelectionModel;

class MyListModel extends AbstractListModel{

	private String nations[] = {"中国","美国","韩国","法国","英国"};
	
	@Override
	public int getSize() {							
		// TODO 自动生成的方法存根
		return this.nations.length;
	}

	@Override
	public Object getElementAt(int index) {		//返回指定标号的元素
		// TODO 自动生成的方法存根
		if(index<this.nations.length){
			return this.nations[index];
		}else{
			return null;
		}
	}
}

class myList{
	private JFrame frame = new JFrame("窗体");					//定义窗体
	private Container cont = frame.getContentPane();			//得到窗体容器
	private JList list1  = null;															//定义列表框
	private JList list2  = null;															//定义列表框
	public myList(){
		this.list1 = new JList(new MyListModel());
		this.list2 = new JList(new MyListModel());
		//定义一个列表框的边框显示条
		list1.setBorder(BorderFactory.createTitledBorder("哪个国家？"));
		list2.setBorder(BorderFactory.createTitledBorder("Vector?"));
		//第一个列表框一次可以选择多个选项
		list1.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
		//第二个列表框每次可以选择一个选项
		list2.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
		cont.add(this.list1);					//加入面板
		cont.add(this.list2);					//加入面板
		this.frame.setSize(330,200);
		this.frame.setVisible(true);
		this.frame.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e) {			//窗口关闭时触发，按下关闭按钮
			// TODO 自动生成的方法存根
			System.out.println("windowClosing-->窗口关闭");
			System.exit(1);
			}
		});
	}
}

public class JModel_demo {

	public static void main(String[] args) {
		// TODO 自动生成的方法存根
		new MyList();
	}

}

 

监听只能加一个

import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Vector;

import javax.swing.AbstractListModel;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

class MyListModel extends AbstractListModel{

	private String nations[] = {"中国","美国","韩国","法国","英国"};
	
	@Override
	public int getSize() {							
		// TODO 自动生成的方法存根
		return this.nations.length;
	}

	@Override
	public Object getElementAt(int index) {		//返回指定标号的元素
		// TODO 自动生成的方法存根
		if(index<this.nations.length){
			return this.nations[index];
		}else{
			return null;
		}
	}
}

class myList implements ListSelectionListener{
	private JFrame frame = new JFrame("窗体");					//定义窗体
	private Container cont = frame.getContentPane();			//得到窗体容器
	private JList list1  = null;															//定义列表框
//	private JList list2  = null;															//定义列表框
	public myList(){
		this.list1 = new JList(new MyListModel());
//		this.list2 = new JList(new MyListModel());
		//定义一个列表框的边框显示条
		list1.setBorder(BorderFactory.createTitledBorder("哪个国家？"));
//		list2.setBorder(BorderFactory.createTitledBorder("Vector?"));
		//第一个列表框一次可以选择多个选项
		list1.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
		//第二个列表框每次可以选择一个选项
//		list2.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
		
		list1.addListSelectionListener(this); 			//加入事件监听
//		list2.addListSelectionListener(this); 			//加入事件监听
		cont.add(new JScrollPane(this.list1));			//加入滚动条
		
		cont.add(this.list1);					//加入面板
//		cont.add(this.list2);					//加入面板
		this.frame.setSize(330,200);
		this.frame.setVisible(true);
		this.frame.addWindowListener(new WindowAdapter(){	//加入事件监听
			public void windowClosing(WindowEvent arg0) {			//窗口关闭时触发，按下关闭按钮
			// TODO 自动生成的方法存根
			System.out.println("windowClosing-->窗口关闭");
			System.exit(1);
			}
		});
	}
	
	public void valueChanged(ListSelectionEvent e) {
		// TODO 自动生成的方法存根
		int temp[] = list1.getSelectedIndices();				//取得全部选定
		System.out.println("选定的内容：");
		for(int i=0;i<temp.length;i++){
			System.out.println(list1.getModel().getElementAt(i)+"、");
		}
	}
}

//主类
//Function        : 	JModel_demo
public class JModel_demo {

	public static void main(String[] args) {
		// TODO 自动生成的方法存根
		new myList();
	}

}

 

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.util.Scanner;

import javax.imageio.stream.FileImageInputStream;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

class Note implements ActionListener{

	private JFrame frame = new JFrame("窗体");					//定义窗体
	private JTextArea area = new JTextArea("JTextArea");	//定义文本区
	private JButton open = new JButton("打开文件");			//打开文件
	private JButton save = new JButton("保存文件");			//保存文件
	private JLabel label = new JLabel("现在没有打开的文件");
	
	private JPanel butpan = new JPanel();
	
	public Note(){
		this.butpan.add(open);
		this.butpan.add(save);
		//设置窗体中的布局管理器为BorderLayout，所有的组件水平和垂直间距为3
		frame.setLayout(new BorderLayout(3,3));
		frame.add(this.label,BorderLayout.NORTH);
		frame.add(this.butpan,BorderLayout.SOUTH);
		frame.add(this.area, BorderLayout.CENTER);
		this.frame.setSize(330,180);
		this.frame.setVisible(true);
		this.frame.addWindowListener(new WindowAdapter(){	//加入事件监听
			public void windowClosing(WindowEvent arg0) {			//窗口关闭时触发，按下关闭按钮
			// TODO 自动生成的方法存根
			System.out.println("windowClosing-->窗口关闭");
			System.exit(1);
			}
		});
		this.open.addActionListener(this);
		this.save.addActionListener(this);
//		this.frame.setSize(330,180);
//		this.frame.setVisible(true);
	}
	
	@Override
	public void actionPerformed(ActionEvent e) {	//按键事件监听
		// TODO 自动生成的方法存根
		File file = null;
		int result = 0;
		JFileChooser fileChooser = new JFileChooser();
		if(e.getSource() == this.open){
			this.area.setText("");
			fileChooser.setApproveButtonText("确定");		//定义“确定“按钮”
			fileChooser.setDialogTitle("打开文件");				//定义文件选择框标题
			result = fileChooser.showOpenDialog(this.frame);		//显示打开对话框
			if(result == JFileChooser.APPROVE_OPTION){
				file = fileChooser.getSelectedFile();
				this.label.setText("打开的文件名称为："+file.getName());
			}else if(result == JFileChooser.CANCEL_OPTION){
				this.label.setText("没有选择任何文件");
			}else{
				this.label.setText("操作出现错误");
			}
			if(file != null){
				try{
					Scanner scan = new Scanner(new FileInputStream(file));//设置输入流
					scan.useDelimiter("\n");						//设置换行为分隔符
					while(scan.hasNext()){							//循环读取
						this.area.append(scan.next());		//读取内容到文本区
						this.area.append("\n");					//设置换行
					}
					scan.close();												//关闭
				}catch(Exception ex){
					this.label.setText("文件读取出错");
				}
			}
		}
		
		if(e.getSource() == this.save){

			result = fileChooser.showSaveDialog(this.frame);		//显示保存文件框
			if(result == JFileChooser.APPROVE_OPTION){
				file = fileChooser.getSelectedFile();
				this.label.setText("存储的文件名称为："+file.getName());
			}else if(result == JFileChooser.CANCEL_OPTION){
				this.label.setText("没有选择任何文件");
			}else{
				this.label.setText("操作出现错误");
			}
			if(file != null){
				try{
					PrintStream out = new PrintStream(new FileOutputStream(file));
					out.print(this.area.getText());
					out.close();
				}catch(Exception ex){
					this.label.setText("文件保存出错");
				}
			}
		}
		
	}
	
}



//主类
//Function        : 	JFileChooser_demo
public class JFileChooser_demo {

	public static void main(String[] args) {
		// TODO 自动生成的方法存根
		new Note();
		
		
		
	}

}