带计时器的做题器（gui

新学

1

JCheckBox chckbxA = new JCheckBox("a");

JCheckBox的监听器接口ItemListener，响应方法itemStateChanged

boolean isSelect=a.isSelected();是否被选

a.setSelected(false);可以控制 是否选择

2

Timer类stop了,好像不用restart,直接start就可以了

package thread;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.border.EmptyBorder;
import javax.swing.JTextArea;

public class MyWin extends JFrame implements ActionListener,ItemListener {

    private JPanel contentPane;
    JButton xuantimu = new JButton("\u9009\u9898\u76EE");
    JFileChooser file1=new JFileChooser();
    File dir;
    int MaxTime=8;
    JLabel second = new JLabel("剩8秒  问题：");
    JTextArea text = new JTextArea();
    JLabel label2 = new JLabel("分数：");
    JButton button = new JButton("再做一遍");
    Timer timer1=new Timer(1000,this);
    String daan=null;
    FileReader fileReader;
    BufferedReader in1;
    int fenshu=0;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    MyWin frame = new MyWin();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public MyWin() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 719, 145);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 0));
        setContentPane(contentPane);

        JPanel panel = new JPanel();
        contentPane.add(panel, BorderLayout.CENTER);

        panel.add(xuantimu);

        panel.add(second);

        text.setColumns(17);
        text.setRows(3);
        panel.add(text);

        JCheckBox chckbxA = new JCheckBox("a");
        panel.add(chckbxA);

        JCheckBox chckbxB = new JCheckBox("b");
        panel.add(chckbxB);

        JCheckBox chckbxC = new JCheckBox("c");
        panel.add(chckbxC);

        JCheckBox chckbxD = new JCheckBox("d");
        panel.add(chckbxD);

        panel.add(label2);

        panel.add(button);

        chckbxA.addItemListener(this);
        chckbxB.addItemListener(this);
        chckbxC.addItemListener(this);
        chckbxD.addItemListener(this);

        button.addActionListener(this);
        xuantimu.addActionListener(this);

    }

    void readNext(){
         try{
             text.setText(null);
             String s=null;
             for(;(s=in1.readLine())!=null;){
                 if(!s.startsWith("-")){
                     text.append(s+"\n");
                 }
                 else{
                     s=s.replaceAll("-","");
                     daan=s;
                     break;
                 }
             }
             timer1.start();
         }
         catch(Exception e){
             System.out.println("2222");
             System.out.println(e.getMessage());
         }
    }
    void setFile(){
        int state=file1.showOpenDialog(this);
        if(state==JFileChooser.APPROVE_OPTION){
            try{
                dir=file1.getSelectedFile();
                fileReader=new FileReader(dir);
                in1=new BufferedReader(fileReader);
                readNext();
            }
            catch(Exception e1){
                System.out.println("11111");
                System.out.println(e1.getMessage());
            }
        }
    }
    @Override
    public void itemStateChanged(ItemEvent e) {
        // TODO 自动生成的方法存根
        JCheckBox a=(JCheckBox)e.getItemSelectable();
        String s=a.getText();
//        System.out.println(s);
//        System.out.println(daan);
        boolean isSelect=a.isSelected();
        if(s.equals(daan.trim())&&isSelect){
            fenshu++;
            label2.setText("分数"+fenshu);
            timer1.stop();
            MaxTime=8;
            readNext();
            a.setSelected(false);
        }
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO 自动生成的方法存根
        if(e.getSource()==timer1){
            second.setText("剩"+MaxTime+"秒"+",问题");
            MaxTime--;
            if(MaxTime<=0){
                MaxTime=8;
                readNext();
            }

        }
        else if(e.getSource()==button){
            fenshu=0;
            setFile();
        }
        else if(e.getActionCommand()=="选题目"){
            setFile();
        }
    }

}