Question

import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.lang.Runnable;
import java.lang.InterruptedException;

public class Phone implements ActionListener {
        String action = "";
        int callCount = 0;
        int cn = 0;
        boolean calling = false;

        JFrame frame;
        JPanel textPanel;
        JPanel buttonPanel;
        JTextField text;
        JTextArea input;

        JButton one = new JButton("1");
        JButton two = new JButton("2");
        JButton three = new JButton("3");
        JButton four = new JButton("4");
        JButton five = new JButton("5");
        JButton six = new JButton("6");
        JButton seven = new JButton("7");
        JButton eight = new JButton("8");
        JButton nine = new JButton("9");
        JButton zero = new JButton("0");
        JButton star = new JButton("*");
        JButton hash = new JButton("#");
        JButton erase = new JButton("Erase");
        JButton call = new JButton("Call");
        JButton back = new JButton("<=");

    public Phone() {
        frame = new JFrame();
        frame.setTitle("Phone");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(250, 400);

        input = new JTextArea(10, 20);
        textPanel = new JPanel();
        textPanel.add(input);

        buttonPanel = new JPanel();
        buttonPanel.setLayout(new GridLayout(5, 3));

        frame.add(textPanel, BorderLayout.NORTH);
        frame.add(buttonPanel, BorderLayout.CENTER);


        buttonPanel.add(one);
        one.addActionListener(this);
        one.setActionCommand("1");

        buttonPanel.add(two);
        two.addActionListener(this);
        two.setActionCommand("2");

        buttonPanel.add(three);
        three.addActionListener(this);
        three.setActionCommand("3");

        buttonPanel.add(four);
        four.addActionListener(this);
        four.setActionCommand("4");

        buttonPanel.add(five);
        five.addActionListener(this);
        five.setActionCommand("5");

        buttonPanel.add(six);
        six.addActionListener(this);
        six.setActionCommand("6");

        buttonPanel.add(seven);
        seven.addActionListener(this);
        seven.setActionCommand("7");

        buttonPanel.add(eight);
        eight.addActionListener(this);
        eight.setActionCommand("8");

        buttonPanel.add(nine);
        nine.addActionListener(this);
        nine.setActionCommand("9");

        buttonPanel.add(star);
        star.addActionListener(this);
        star.setActionCommand("*");

        buttonPanel.add(zero);
        zero.addActionListener(this);
        zero.setActionCommand("0");

        buttonPanel.add(hash);
        hash.addActionListener(this);
        hash.setActionCommand("#");

        buttonPanel.add(erase);
        erase.addActionListener(this);
        erase.setActionCommand("Erase");

        buttonPanel.add(call);
        call.addActionListener(this);
        call.setActionCommand("Call");

        buttonPanel.add(back);
        back.addActionListener(this);
        back.setActionCommand("Back");

        frame.setVisible(true);

    }

    public void actionPerformed(ActionEvent e){
        if(e.getSource() == one || e.getSource() == two || e.getSource() == three 
                || e.getSource() == four || e.getSource() == five
                || e.getSource() == six || e.getSource() == seven
                || e.getSource() == eight || e.getSource() == nine
                || e.getSource() == zero){
            action = input.getText();
            action += e.getActionCommand();
            action = addDash(action);
            input.setText(action);
            System.out.println(""+e.getActionCommand());
        }
        if(e.getSource() == erase){
            action = input.getText();
            action = erase(action);
            input.setText(action);
            System.out.println(""+e.getActionCommand());
        }
        if(e.getSource() == back){
            action = input.getText();
            action = remove(action);
            input.setText(action);
            System.out.println(""+e.getActionCommand());
        }
        if(e.getSource() == call){
            if(!calling){
                String temp = input.getText();
                action = called(temp);
                input.setText(temp + "\n" + action);
                System.out.println(""+e.getActionCommand());
                calling = true;
            } else{
                calling = false;
                String temp = input.getText();
                input.setText(temp + "\n" + "Hanging Up...");
                r.run();
              }
        }
        if(e.getSource() == star){
            action = input.getText();
            action = erase(action);
            input.setText("YOU BAST*&#!");
            System.out.println(""+e.getActionCommand());
        }
        if(e.getSource() == hash){
            action = input.getText();
            action = erase(action);
            input.setText("OMG YOU KILLED KENNY!");
            System.out.println(""+e.getActionCommand());
        }
    }

    public String called(String s){
        if(s.length() == 8){
            return s = String.format("Calling %s%s%s", s.substring(0, 3),
                    s.substring(3, 8), s.substring(8, s.length()));
        }
        if(s.length() == 13){
            return s = String.format("Calling %s%s%s", s.substring(0, 3),
                    s.substring(3, 8), s.substring(8, 13));
        }
        if(s.length() == 0){
            return s;
        }
        return s = "Ill formed number";
    }

    public String addDash(String s){
        if(s.length() == 4){
            return s = String.format("%s-%s", s.substring(0, 3),
                    s.substring(3, s.length()));
        }
        if(s.length() == 9){
            return s = String.format("%s%s-%s", s.substring(0, 3),
                    s.substring(3, 8), s.substring(8, s.length()));
        }
        if(s.length() > 12){
            return s = String.format("%s%s%s", s.substring(0, 3),
                    s.substring(3, 8), s.substring(8, 13));
        }
        return s;
    }

    public String remove(String s){
        return s = String.format("%s", s.substring(0, s.length() -1));
    }

    public String erase(String s){
        return s = String.format("%s", s.substring(0, 0));
    }

    Runnable r = new Runnable() {

        public void run() {
            try{
                Thread.sleep(2000);
                action = input.getText();
                action = erase(action);
                input.setText(action);
            }
            catch(InterruptedException e){
                System.out.println("Thread Interrupted" + e);
            }
        }
    };
}

我需要线程上方的三行代码在线程休眠2秒之前执行。这样，当手机“挂断”时，它会显示在GUI文本区域上，然后发生睡眠，模拟挂机。

我不明白为什么在运行时没有发生这种情况，即使变量调用设置为false;跟随它的两行不会被执行。

我指的代码是：

else{
            calling = false;//executes
            String temp = input.getText();//does not execute
            input.setText(temp + "\n" + "Hanging Up...");//does not execute
            r.run();
          }

此代码位于actionPerformed方法的调用按钮的if语句中。

Answer 1

在Java中Runnable！= Thread。在您的代码中，您可以在runnable上调用run()，但您从未创建过线程。您需要执行类似

的操作

new Thread(r).start();

某处。所以我不确定你说的是3行代码，但是线程从未创建过。

确定。假设您根本不创建任何新线程，只能直接从run()方法内部执行代码。在这种情况下，Thread.sleep(2000)只会锁定UI 2秒钟。

Answer 2

执行Runnable的方式使其在当前线程上运行，而不是在新线程上运行。要在新线程上运行它，请使用它：

new Thread(r).start();

代码正在被跳过

2 个答案: