java代碼功能

Java 是一種編程語言,它本身的作用是通過編寫應(yīng)用程序，幫助人們解決日常工作、生活和學習遇到的問題。

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一些常見的java功能代碼。如復(fù)制文件夾及文件到指定目錄，遍歷指定盤符所有文件，檢索字符串是否符合指定要求。

關(guān)于java中計算機的功能實現(xiàn)代碼求大神指導(dǎo)

import?java.util.Scanner;

import?java.awt.*;

import?java.awt.event.*;

public?class?Test?extends?WindowAdapter?{

Panel?p1?=?new?Panel();

Panel?p2?=?new?Panel();

Panel?p3?=?new?Panel();

TextField?txt;

private?Button[]?b?=?new?Button[17];

private?String?ss[]?=?{?"7",?"8",?"9",?"+",?"4",?"5",?"6",?"-",?"1",?"2",

"3",?"*",?"clear",?"0",?"=",?"/",?"close"?};

static?double?a;

static?String?s,?str;//?定義變量?創(chuàng)建對像

public?static?void?main(String?args[])?{

(new?Test()).frame();

}

public?void?frame()?{

Frame?fm?=?new?Frame("簡單計算器");

for?(int?i?=?0;?i?=?16;?i++)?{

b[i]?=?new?Button(ss[i]);

}

for?(int?i?=?0;?i?=?15;?i++)?{

p2.add(b[i]);

}?//?創(chuàng)建按鈕?并添加到P2

b[16].setBackground(Color.yellow);

txt?=?new?TextField(15);

txt.setEditable(false);

for?(int?i?=?0;?i?=?16;?i++)?{

b[i].addActionListener(new?buttonlistener());//?添加監(jiān)聽器

}

b[16].addActionListener(new?close());

fm.addWindowListener(this);

fm.setBackground(Color.red);

p1.setLayout(new?BorderLayout());

p1.add(txt,?"North");

p2.setLayout(new?GridLayout(4,?4));

p3.setLayout(new?BorderLayout());

p3.add(b[16]);

fm.add(p1,?"North");

fm.add(p2,?"Center");

fm.add(p3,?"South");

fm.pack();

fm.setVisible(true);//?都是些窗中設(shè)置?添加相關(guān)組件和監(jiān)聽器

}

public?void?windowClosing(WindowEvent?e)?{

System.exit(0);//?退出系統(tǒng)

}

class?buttonlistener?implements?ActionListener?{//?編寫監(jiān)聽器事件?通過按鍵得出給果

public?void?actionPerformed(ActionEvent?e)?{

Button?btn?=?(Button)?e.getSource();

if?(btn.getLabel()?==?"=")?{

jisuan();

str?=?String.valueOf(a);

txt.setText(str);

s?=?"";

}?else?if?(btn.getLabel()?==?"+")?{

jisuan();

txt.setText("");

s?=?"+";

}?else?if?(btn.getLabel()?==?"-")?{

jisuan();

txt.setText("");

s?=?"-";

}?else?if?(btn.getLabel()?==?"/")?{

jisuan();

txt.setText("");

s?=?"/";

}?else?if?(btn.getLabel()?==?"*")?{

jisuan();

txt.setText("");

s?=?"*";

}?else?{

txt.setText(txt.getText()?+?btn.getLabel());

if?(btn.getLabel()?==?"clear")

txt.setText("");

}

}

public?void?jisuan()?{//?編寫具體計算方法

if?(s?==?"+")

a?+=?Double.parseDouble(txt.getText());

else?if?(s?==?"-")

a?-=?Double.parseDouble(txt.getText());

else?if?(s?==?"*")

a?*=?Double.parseDouble(txt.getText());

else?if?(s?==?"/")

a?/=?Double.parseDouble(txt.getText());

else

a?=?Double.parseDouble(txt.getText());

}

}

}

class?close?implements?ActionListener?{//?退出

public?void?actionPerformed(ActionEvent?e)?{

System.exit(0);

}

}

使用java編寫代碼如下要求

NewPhone類

package?com.baidu.question;

public?class?NewPhone?extends?Phone?{

private?boolean?mute?=?true;

@Override

public?void?call()?{

if(mute){

super.call();

}else{

System.out.println("語音已關(guān)閉");

}

}

//這里是直接設(shè)置

public?void?setMute(boolean?mute){

this.mute=mute;

}

//擔心你的題目是要求兩種方法，寫的第二種，下面兩個方法負責開關(guān)

public?void?openMute(){

this.mute=true;

/*

*?也可以這樣寫

*?setMute(true);

*?下邊的方法一樣

*?*/

}

public?void?closeMute(){

this.mute?=?false;

}

}

Phone類

package?com.baidu.question;

public?class?Phone?{

public?void?call(){

System.out.println("打電話");

}

}

測試類

package?com.baidu.question;

public?class?PhoneTest?{

public?static?void?main(String[]?args)?{

Phone?phone?=?new?Phone();

phone.call();

NewPhone?newPhone?=?new?NewPhone();

newPhone.call();

newPhone.setMute(false);

newPhone.call();

newPhone.openMute();

newPhone.call();

newPhone.closeMute();

newPhone.call();

}

}

測試結(jié)果

打電話

打電話

語音已關(guān)閉

打電話

語音已關(guān)閉

利用java編寫代碼實現(xiàn)如下功能，需要全部代碼

很簡單的應(yīng)用，為了節(jié)省字數(shù)，代碼注釋我就不加了

首先是顯示層，LoinWindow：

import?java.awt.FlowLayout;

import?java.awt.GridBagConstraints;

import?java.awt.GridBagLayout;

import?java.awt.GridLayout;

import?java.awt.event.ActionEvent;

import?java.awt.event.ActionListener;

import?java.awt.event.FocusEvent;

import?java.awt.event.FocusListener;

import?javax.swing.JButton;

import?javax.swing.JFrame;

import?javax.swing.JLabel;

import?javax.swing.JOptionPane;

import?javax.swing.JPanel;

import?javax.swing.JTextField;

import?javax.swing.border.EmptyBorder;

public?class?LoinWindow?extends?JFrame?implements?ActionListener,?FocusListener?{

private?JPanel?mainPanel,?namePanel,?btnPanel;

private?JTextField?tfName,?tfPsd;

private?JButton?btnLogin,?btnCancel;

private?static?final?int?WIDTH?=?300;

private?static?final?int?HEIGHT?=?200;

private?LoginService?service?=?new?LoginService();

public?LoinWindow()?{

super("登錄窗體");

}

public?void?launch()?{

setSize(WIDTH,?HEIGHT);

setVisible(true);

setDefaultCloseOperation(EXIT_ON_CLOSE);

GridLayout?mainLayout?=?new?GridLayout(2,?1);

mainLayout.setVgap(10);

mainPanel?=?new?JPanel(mainLayout);

GridBagLayout?nameLayout?=?new?GridBagLayout();

namePanel?=?new?JPanel(nameLayout);

namePanel.setBorder(new?EmptyBorder(10,?10,?10,?10));

JLabel?nameLabel?=?new?JLabel("姓名：");

tfName?=?new?JTextField();

JLabel?psdLabel?=?new?JLabel("密碼：");

tfPsd?=?new?JTextField();

JLabel?blank?=?new?JLabel("?");

namePanel.add(nameLabel);

namePanel.add(tfName);

namePanel.add(blank);

namePanel.add(psdLabel);

namePanel.add(tfPsd);

GridBagConstraints?s?=?new?GridBagConstraints();

s.fill?=?GridBagConstraints.BOTH;

s.gridwidth?=?1;

s.weightx?=?0;

s.weighty?=?0;

nameLayout.setConstraints(nameLabel,?s);

s.gridwidth?=?0;

s.weightx?=?1;

s.weighty?=?0;

nameLayout.setConstraints(tfName,?s);

s.gridwidth?=?0;

s.weightx?=?4;

s.weighty?=?0;

nameLayout.setConstraints(blank,?s);

s.gridwidth?=?1;

s.weightx?=?0;

s.weighty?=?0;

nameLayout.setConstraints(psdLabel,?s);

s.gridwidth?=?3;

s.weightx?=?1;

s.weighty?=?0;

nameLayout.setConstraints(tfPsd,?s);

FlowLayout?btnLayout?=?new?FlowLayout();

btnLayout.setAlignment(FlowLayout.CENTER);

btnPanel?=?new?JPanel(btnLayout);

btnLogin?=?new?JButton("確定");

btnCancel?=?new?JButton("取消");

btnPanel.add(btnLogin);

btnPanel.add(btnCancel);

btnCancel.addActionListener(this);

btnLogin.addActionListener(this);

mainPanel.add(namePanel);

mainPanel.add(btnPanel);

setContentPane(mainPanel);

tfName.addFocusListener(this);

tfPsd.addFocusListener(this);

pack();

setSize(WIDTH,?HEIGHT);

setLocationRelativeTo(null);

}

@Override

public?void?actionPerformed(ActionEvent?e)?{

Object?source?=?e.getSource();

if(source?==?btnCancel)?{

System.exit(0);

}?else?if(source?==?btnLogin)?{

String?username?=?tfName.getText();

String?password?=?tfPsd.getText();

boolean?success?=?service.login(username,?password);

if(success)?{

warn("成功",?"登錄成功！");

}?else?{

warn("失敗",?"您輸入的用戶名或密碼錯誤?！");

}

}

}

@Override

public?void?focusGained(FocusEvent?arg0)?{

}

@Override

public?void?focusLost(FocusEvent?e)?{

Object?source?=?e.getSource();

if(source?==?tfName)?{

String?username?=?tfName.getText();

try?{

service.matchUsername(username);

}?catch?(LoginException?e1)?{

warn("驗證錯誤",?e1.getMessage());

}

}?else?if(source?==?tfPsd)?{

String?password?=?tfPsd.getText();

try?{

service.matchPassword(password);

}?catch?(LoginException?e1)?{

warn("驗證錯誤",?e1.getMessage());

}

}

}

private?void?warn(String?title,?String?msg)?{

JOptionPane.showMessageDialog(null,?msg,?title,?JOptionPane.INFORMATION_MESSAGE);

}

public?static?void?main(String[]?args)?{

new?LoinWindow().launch();

}

}

然后是模型層：LoginDao

public?class?LoginDao?{

public?boolean?login(String?username,?String?password)?{

if(username.equals("admin")??password.equals("12345"))?{

return?true;

}

return?false;

}

}

LoginService

import?java.util.regex.Pattern;

public?class?LoginService?{

private?static?final?Pattern?LOGIN_PATTERN?=?Pattern.compile("[a-zA-Z]+");

private?static?final?Pattern?PASSWORD_PATTERN?=?Pattern.compile("[1-9]+");

private?LoginDao?dao?=?new?LoginDao();

public?boolean?matchUsername(String?username)?throws?LoginException?{

if(null?==?username?||?username.isEmpty())?{

return?false;

}

if(!LOGIN_PATTERN.matcher(username).matches())?{

throw?new?LoginException("您輸入的用戶名不合法，請輸入英文！");

}

return?true;

}

public?boolean?matchPassword(String?password)?throws?LoginException?{

if(null?==?password?||?password.isEmpty())?{

return?false;

}

if(!PASSWORD_PATTERN.matcher(password).matches())?{

throw?new?LoginException("您輸入的密碼不合法，請輸入數(shù)字！");

}

return?true;

}

public?boolean?login(String?username,?String?password)?{

if(null?==?username?||?username.isEmpty())?{

return?false;

}

if(null?==?password?||?password.isEmpty())?{

return?false;

}

if(!dao.login(username,?password))?{

return?false;

}

return?true;

}

}

LoginException

public?class?LoginException?extends?Exception?{

public?LoginException(String?arg0)?{

super(arg0);

}

}

不知道分層設(shè)計思想是不是我想的這樣

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