java 实验报告第五个

一时失言乱红尘 2022-08-06 03:15 163阅读 0赞

第一个，一个按钮，点击它，出现第二个窗口

代码如下：

package javademo;
    
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    
    public class guinew {
    
    	public static void main(String[] args) {
    		JFrame jf = new JFrame("New");
    		jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		jf.setSize(200, 200);
    		JButton jb = new JButton("Click");
    		jb.setBounds(2,2,5,5);
    		
    		jb.addActionListener(new ActionListener() {
    			
    			@Override
    			public void actionPerformed(ActionEvent e) {
    				JFrame two = new JFrame("The Second!");
    				two.setSize(333,222);
    				JLabel jl = new JLabel("这是第二个");
    				two.add(jl);
    				two.setVisible(true);
    			}
    		});
    		jf.add(jb);
    		jf.setVisible(true);
    	}
    
    }

第二个：登陆窗口

代码如下：

package javademo;
    
    import java.awt.Dialog;
    import java.awt.FlowLayout;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JOptionPane;
    import javax.swing.JTextField;
    
    public class login {
    
    	public static void main(String[] args) {
    		final JFrame jf = new JFrame("user login");
    		jf.setLayout(new FlowLayout());
    		jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		jf.setBounds(20,20,200,200);
    		JLabel userl = new JLabel("用户名：");
    		JLabel passl = new JLabel("密码：");
    		JButton jb = new JButton("登陆");
    		final JTextField user = new JTextField(15);
    		
    		final JTextField pass = new JTextField(15);
    		jf.add(userl);
    		jf.add(user);
    		jf.add(passl);
    		jf.add(pass);
    		jf.add(jb);
    		
    		
    		
    		jb.addActionListener(new ActionListener() {
    			
    			@Override
    			public void actionPerformed(ActionEvent e) {
    				JOptionPane jo = new JOptionPane();
    				
    				if(user.getText().toString().equals("study java")&&pass.getText().equals("123456")){
    					jo.showMessageDialog(jf, "ssssss", "tt",JOptionPane.INFORMATION_MESSAGE);
    					
    				}else
    				{
    					
    					jo.showMessageDialog(jf, "eeeeee", "tt",JOptionPane.WARNING_MESSAGE);
    				}
    				
    			}
    		});
    		
    		
    		
    		userl.setVisible(true);
    		user.setVisible(true);
    		passl.setVisible(true);
    		pass.setVisible(true);
    		
    		jf.setVisible(true);
    		
    	}
    
    }

第三个，记事本功能

代码如下：

package javademo;
    import java.awt.Button;
    import java.awt.Frame;
    import java.awt.Menu;
    import java.awt.MenuBar;
    import java.awt.MenuItem;
    import java.awt.ScrollPane;
    import java.awt.TextArea;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.awt.event.WindowAdapter;
    import java.awt.event.WindowEvent;
    import java.io.BufferedReader;
    import java.io.BufferedWriter;
    import java.io.File;
    import java.io.FileNotFoundException;
    import java.io.FileReader;
    import java.io.FileWriter;
    import java.io.IOException;
    
    
    public class Gui {
    public static void main(String[] args) {
    	 init();
    	}
    
    
    
    private static  void init() {
    	Frame frame = new Frame("NOTEPAD");
    		
    		
    		frame.setBounds(20, 20, 1000, 500);
    		
    		Button jb = new Button("Open");
    		Button flush = new Button("flush");
    		
    	
    		final TextArea ta = new TextArea("text",300,300);
    		ScrollPane pane = new ScrollPane();
    		pane.add(ta);
    		
    		
    		
    		MenuBar bar = new MenuBar();
    		Menu menu = new Menu("文件");
    		MenuItem open = new MenuItem("打开");
    		MenuItem close = new MenuItem("关闭");
    		MenuItem save = new MenuItem("保存");
    		
    		
    		
    		
    		bar.add(menu);
    		menu.add(open);
    		menu.add(save);
    		menu.add(close);
    		
    		open.addActionListener(new ActionListener() {
    			
    			@Override
    			public void actionPerformed(ActionEvent e) {
    				File myfile = new File("d://xx//aa.txt");
    				try {
    					BufferedReader bufr = new BufferedReader(new FileReader(myfile));
    					String tempStr;
    					try {
    						ta.setText("");
    						//System.getProperty("LINE.SEPARATOR")
    						while((tempStr=bufr.readLine())!=null){
    							ta.setText(ta.getText()+tempStr+"\n");
    						}
    						bufr.close();
    					} catch (IOException e1) {
    						e1.printStackTrace();
    					}
    				
    				} catch (FileNotFoundException e1) {
    					e1.printStackTrace();
    				}
    			}
    		});
    		
    		save.addActionListener(new ActionListener() {
    			
    			@Override
    			public void actionPerformed(ActionEvent e) {
    				try {
    					BufferedWriter bufw = new BufferedWriter(new FileWriter("d://xx//aa.txt"));
    					String writeStr;
    					writeStr=ta.getText();
    					bufw.write(writeStr);
    					bufw.flush();
    					bufw.close();
    				} catch (IOException e1) {
    					e1.printStackTrace();
    				}
    			}
    		});
    		
    		close.addActionListener(new ActionListener() {
    			
    			@Override
    			public void actionPerformed(ActionEvent e) {
    					System.exit(0);
    			}
    		});
    		
    		frame.addWindowListener(new WindowAdapter()
    		{
    
    			@Override
    			public void windowClosing(WindowEvent e) {
    				System.exit(0);
    			}
    
    			
    			
    			
    		});
    			
    			
    		
    		
    
    		frame.setMenuBar(bar);
    		frame.add(pane);
    		
    		flush.setVisible(true);
    		jb.setVisible(true);
    		frame.setVisible(true);
    	}
    }