GUI练习：根据ID查询学生信息

曾经终败给现在 2021-09-29 14:10 367阅读 0赞

【一】需求

> 查询学生信息：  
> 已知stu.txt中有一些的学生信息。  
> 根据学生ID号查询学生信息

【二】代码

import java.io.*;
    import java.util.*;
    import java.awt.*;
    import java.awt.event.*;
    class Student
    {
    	private String name;
    	private int age;
    
    	Student(String name,int age){
    		this.name=name;
    		this.age=age;
    	}
    	public String toString(){
    		return name+"--"+age;
    	}
    }
    class SearchStudent
    {
    	private Frame f;
    	private TextField tf;
    	private Button but;
    	private TextArea ta;
    	private Dialog d;
    	private Label l;
    	private Button b;
    	private Map<String,Student> stu;
    	SearchStudent(){
    		init();
    	}
    	private void init(){
    		f=new Frame("学生信息");
    		tf=new TextField(60);
    		but=new Button("查询");
    		ta=new TextArea(12,70);//制定行数列数
    		f.setBounds(100,200,600,300);
    		f.setLayout(new FlowLayout());
    		f.add(tf);
    		f.add(but);
    		f.add(ta);
    		f.setVisible(true);
    		d=new Dialog(f,"提示信息",true);
    		l=new Label();
    		//"输入格式不对(学生学号格式为"001")或该学生信息不存在"
    		b=new Button("确定");
    		d.setBounds(110,220,500,250);
    		d.add(l);
    		d.add(b);
    		d.setLayout(new FlowLayout());
    		myEvent();
    	}
    	private void infor(){
    		stu=new TreeMap<String,Student>();
    		stu.put("001",new Student("zhangsan",12));
    		stu.put("004",new Student("wangwu",11));
    		stu.put("006",new Student("zhaoliu",22));
    		stu.put("101",new Student("qianbaobao",23));
    		stu.put("021",new Student("zhuxiao",14));
    	}
    	private void myEvent(){
    		infor();
    		//点击X号退出
    		f.addWindowListener(new WindowAdapter(){
    			public void windowClosing(WindowEvent e){
    				System.exit(0);
    			}
    		});
    		//敲击回车键查询
    		tf.addKeyListener(new KeyAdapter(){
    			public void keyPressed(KeyEvent e){
    				int code=e.getKeyCode();
    				if(code==KeyEvent.VK_ENTER){
    					show();
    				}
    			}
    		});
    		//点击按钮查询
    		but.addActionListener(new ActionListener(){
    			public void actionPerformed(ActionEvent e){
    				show();
    			}
    		});
    		//点击对话框的X,对话框消失。
    		d.addWindowListener(new WindowAdapter(){
    			public void windowClosing(WindowEvent e){
    					d.setVisible(false);
    				}
    		});
    		//点击确定按钮,对话框消失。
    		b.addMouseListener(new MouseAdapter(){
    			public void mouseClicked(MouseEvent e){
    				d.setVisible(false);
    			}
    		});
    	}
    	private void show(){
    		ta.setText("");
    		String select=tf.getText();
    		if(stu.containsKey(select)){
    			ta.append("学生信息："+stu.get(select));
    		}else{
    			l.setText(select+"不存在，请重新输入！");
    			d.setVisible(true);
    		}
    	}
    	public static void main(String[] args) 
    	{
    		new SearchStudent();
    	}
    }

【三】截图

学生信息存在：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RoZV9CZXN0X0hhY2tlcg_size_16_color_FFFFFF_t_70][]

学生信息不存在：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RoZV9CZXN0X0hhY2tlcg_size_16_color_FFFFFF_t_70 1][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RoZV9CZXN0X0hhY2tlcg_size_16_color_FFFFFF_t_70]: /images/20210811/3d3f564e63f8434eaa25c94a8b83c2d1.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RoZV9CZXN0X0hhY2tlcg_size_16_color_FFFFFF_t_70 1]: /images/20210811/934c4541d9774fcda858172e9af700ea.png