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java怎么讓代碼自動
你說的是Eclipse代碼自動補(bǔ)全功能吧?？梢詫崿F(xiàn)輸入任意字母均可出現(xiàn)代碼補(bǔ)全提示框。
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具體設(shè)置方式如下：
eclipse--windows--preferences--java--editor--content assist--右邊設(shè)置如下圖
紅色箭頭指向的地方設(shè)置為：
.abcdefghijklmnopqrstuvwxyz(26個字母全部寫進(jìn)去不區(qū)分大小寫)
用java編寫一個倒計時器代碼。
import java.awt.BorderLayout;import java.awt.Container;import java.awt.Font;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JTextField;public class TimerDemo extends JFrame implements ActionListener { private static final long serialVersionUID = 201306211111L; private JTextField screen = new JTextField("0"); private JButton start = new JButton("開始"); private JButton reset = new JButton("重置"); private JPanel panel = new JPanel(); private boolean isRunning; private int time; private int timeBetween; public TimerDemo(int timeBetween) { super("計時器"); this.timeBetween = timeBetween; try { init(); } catch (Exception e) { e.printStackTrace(); } } public TimerDemo() { super("計時器"); this.timeBetween = 100; try { init(); } catch (Exception e) { e.printStackTrace(); } } private void init() { panel.setLayout(new GridLayout()); panel.add(start); panel.add(reset); start.addActionListener(this); reset.addActionListener(this); screen.setFont(new Font("幼圓", Font.BOLD, 60)); screen.setHorizontalAlignment(JTextField.CENTER); screen.setEditable(false); Container c = getContentPane(); c.setLayout(new BorderLayout()); c.add(panel, BorderLayout.SOUTH); c.add(screen, BorderLayout.CENTER); this.setSize(200, 150); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setResizable(false); this.setLocationRelativeTo(null); this.setVisible(true); } public static void main(String[] args) { new TimerDemo(1);// 設(shè)定 1ms/次 // new TimerDemo(); } @Override public void actionPerformed(ActionEvent e) { if (e.getSource() == start) { if (start.getText().equals("開始")) { start.setText("暫停"); isRunning = true; } else if (start.getText().equals("暫停")) { start.setText("開始"); isRunning = false; } } if (e.getSource() == reset) { start.setText("開始"); screen.setText("0"); isRunning = false; time = 0; } new Thread(new TimeZone()).start(); } class TimeZone implements Runnable { @Override public void run() { while (isRunning) { time++; if (time = Integer.MAX_VALUE) { screen.setText("ERROR"); JOptionPane.showMessageDialog(null, "ERROR"); isRunning = false; } screen.setText(String.valueOf(time)); try { Thread.sleep(timeBetween); } catch (Exception e) { e.printStackTrace(); } } } }}
java中如何實現(xiàn)自動計時功能，就是點擊一個start按鈕就開始計時，以秒為單位
簡單代碼如下：
import?java.awt.Button;
import?java.awt.FlowLayout;
import?java.awt.Label;
import?java.awt.event.ActionEvent;
import?java.awt.event.ActionListener;
import?java.text.SimpleDateFormat;
import?java.util.Date;
import?javax.swing.JFrame;
import?javax.swing.Timer;
@SuppressWarnings("serial")
public?class?Timers?extends?JFrame?{
final?Label?lab?=?new?Label();
Date?now?=?new?Date();
@SuppressWarnings("deprecation")
public?Timers()?{
now.setHours(0);
now.setMinutes(0);
now.setSeconds(0);
setBounds(550,?270,?200,?150);
final?Timer?timer?=?new?Timer(1000,?new?ActionListener()?{
public?void?actionPerformed(ActionEvent?e)?{
Date?now2?=?new?Date(now.getTime()?+?1000);
now?=?now2;
SimpleDateFormat?formatter?=?new?SimpleDateFormat("HH:mm:ss");
lab.setText(formatter.format(now));
}
});
Button?b1?=?new?Button("開始");
Button?b2?=?new?Button("停止");
b2.setBounds(40,?40,?40,?40);
b1.setBounds(30,?30,?30,?30);
b1.addActionListener(new?ActionListener()?{
@Override
public?void?actionPerformed(ActionEvent?e)?{
Button?b?=?(Button)?e.getSource();
b.setLabel("開始");
timer.start();
}
});
b2.addActionListener(new?ActionListener()?{
@Override
public?void?actionPerformed(ActionEvent?e)?{
Button?b?=?(Button)?e.getSource();
b.setLabel("停止");
timer.stop();
}
});
this.setLayout(new?FlowLayout());
this.add(b2);
this.add(b1);
this.add(lab);
this.setSize(300,?200);
this.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public?static?void?main(String[]?args)?{
Timers?t?=?new?Timers();
t.lab.setText("00:00:00");
}
}
不知是否幫到你，如滿意請采納！
求人用java編寫一條計時器代碼。
import?java.awt.BorderLayout;
import?java.awt.Container;
import?java.awt.GridLayout;
import?java.awt.event.ActionEvent;
import?java.awt.event.ActionListener;
import?java.awt.event.WindowEvent;
import?java.awt.event.WindowListener;
import?java.io.*;
import?java.util.*;
import?javax.swing.JButton;
import?javax.swing.JFrame;
import?javax.swing.JOptionPane;
import?javax.swing.JPanel;
import?javax.swing.JTextField;
import?javax.swing.plaf.OptionPaneUI;
public?class?Demo?{
static?boolean?isRuning=false;
static?boolean?isFirst=true;
@SuppressWarnings("unchecked")
public?static?void?main(String[]?args)?throws?Exception?{
JFrame?form1?=?new?JFrame("Form1");
JTextField?jTextField?=?new?JTextField(10);
jTextField.setSize(10,?10);
jTextField.setText("0");
jTextField.setEditable(false);
JButton?jButton?=?new?JButton("開始");
jButton.setSize(10,?10);
Thread?thread?=?new?Thread(new?Runnable()?{
@Override
public?void?run()?{
while?(true)?{
while(isRuning){
Integer?counter?=?Integer.parseInt(jTextField.getText().trim());
counter++;
jTextField.setText(counter.toString());
try?{
Thread.sleep(1000);
}?catch?(Exception?e2)?{
}
}
}
}
});
jButton.addActionListener(new?ActionListener()?{
@Override
public?void?actionPerformed(ActionEvent?e)?{
???String?text=jButton.getText().equals("開始")?"暫停":"開始";
???jButton.setText(text);
???isRuning=!isRuning;
???if(isFirst){
???thread.start();
???isFirst=false;
???}
}
});
JPanel?panel?=?new?JPanel();
panel.setSize(200,?200);
panel.add(jTextField,?BorderLayout.NORTH);
panel.add(jButton,?BorderLayout.CENTER);
form1.add(panel);
form1.setBounds(200,?100,?250,?150);
form1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
form1.addWindowListener(new?WindowListener()?{
@Override
public?void?windowOpened(WindowEvent?e)?{
//?TODO?Auto-generated?method?stub
}
@Override
public?void?windowIconified(WindowEvent?e)?{
//?TODO?Auto-generated?method?stub
}
@Override
public?void?windowDeiconified(WindowEvent?e)?{
//?TODO?Auto-generated?method?stub
}
@Override
public?void?windowDeactivated(WindowEvent?e)?{
//?TODO?Auto-generated?method?stub
}
@Override
public?void?windowClosing(WindowEvent?e)?{
//?窗口關(guān)閉前取出文本框的數(shù)字保存到外部文件，代碼在此處寫
JOptionPane.showMessageDialog(null,?"Are?you?sure?closing?");
}
@Override
public?void?windowClosed(WindowEvent?e)?{
//?TODO?Auto-generated?method?stub
}
@Override
public?void?windowActivated(WindowEvent?e)?{
//?TODO?Auto-generated?method?stub
}
});
form1.setVisible(true);
}
}
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