博文

OutputStreamWriter用法(2005-09-22 17:21:00)

摘要:example2:OutputStreamWriterDemo.java/************************************************************************以FileOutputStreamDemo.java为摸板,按回车后再按Ctrl+z结束输入,可输入中文************************************************************************/import java.io.*; public class OutputStreamWriterDemo{ public static void main(String[] args)throws IOException  {  try  {   InputStreamReader isr = new InputStreamReader (new FileInputStream (FileDescriptor.in));   OutputStreamWriter osw = new OutputStreamWriter (new FileOutputStream ("D://testfile//output.log"));   int is;   while ((is=isr.read()) != -1)osw.write(is);   isr.close();   osw.close();      }  catch(FileNotFoundException e)  {   System.out.println(e);  }  catch(IOException e)  {   System.out.println(e);  }&nbs......

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Layout用法(2005-09-22 17:20:00)

摘要:import java.awt.FlowLayout;import java.awt.GridLayout;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import javax.swing.ImageIcon;import javax.swing.Box;import javax.swing.SwingConstants;import javax.swing.BoxLayout;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JTabbedPane;import javax.swing.JButton;import java.awt.event.*; public class LayoutDemo{ public static void main(String[] args) {  JFrame frame = new JFrame ("Layout Manager Demo");  frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);    JTabbedPane tp = new JTabbedPane();  tp.addTab ("Flow",new FlowPanel());  tp.addTab ("Border",new BorderPanel());  tp.addTab ("Grid",new GridPanel());  tp.addTab ("Box",new BoxPanel());    frame.setContentPane(tp);  frame.pack();  frame.show(); }} //定义流式布局管理器class FlowPanel exte......

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JTree用法(2005-09-22 17:20:00)

摘要:import java.awt.Dimension;import java.awt.Color;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTree;import javax.swing.BoxLayout;import javax.swing.tree.TreePath;import javax.swing.tree.DefaultMutableTreeNode;import javax.swing.tree.DefaultTreeModel;/*JTree的构造函数:JTree()JTree(Hashtable value)JTree(Object[] value)//只有这个构造函数可以创建多个根结点JTree(TreeModel newModel)JTree(TreeNode root)JTree(TreeNode root, boolean asksAllowsChildren)JTree(Vector value) */public class JTreeDemo{ public static void main (String[] args) {   //构造函数:JTree()  JTree example1 = new JTree();       //构造函数:JTree(Object[] value)  Object[] letters= {"a", "b", "c", "d", "e"};  JTree example2 = new JTree (letters);     //构造函数:JTree(TreeNode root)(TreeNode空)  //用空结点创建树  DefaultMutableTreeNode node1 = new DefaultMutableTreeNode();//定义树结点  JTree example......

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JTextArea用法(2005-09-22 17:19:00)

摘要:import java.awt.Color;import java.awt.Font;import java.awt.Point;import java.awt.Dimension;import javax.swing.BorderFactory;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JFrame;import javax.swing.ImageIcon;public class JTextAreaDemo{ public static void main(String[] args) {  try{javax.swing.UIManager.setLookAndFeel(javax.swing.UIManager.getSystemLookAndFeelClassName());}catch(Exception e){}  JTextArea ta = new JTextArea(20,20);  ta.setBorder (BorderFactory.createEmptyBorder (1,1,1,5));  ta.setColumns (0); ta.setRows (0);//相当于设置文本区组件的初始大小,并不是说一行只能写0个字符;  ta.setLineWrap (false);//设置为禁止自动换行,初始值为false.  ta.setTabSize (4);//设置制表符的大小为8个字符,初始值为4个字符  ta.setWrapStyleWord (true);  ta.setBackground (Color.white);//文本区背景  ta.setForeground (Color.red);//字体颜色  ta.setFont (new Font ("SansSerif", Font.PLAIN, 14));      JScroll......

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JTable用法(2005-09-22 17:19:00)

摘要:import java.awt.Dimension;import javax.swing.JFrame;import javax.swing.JScrollPane;import javax.swing.JPanel;import javax.swing.JTable;import java.awt.Color;import java.awt.GridLayout;import javax.swing.table.TableColumn; public class JTableDemo{ public static void main (String[] args) {  /*  构造函数有很多下面先介绍几个:  JTable()  JTable(int numRows, int numColumns)  JTable(Object[][] rowData, Object[] columnNames)  */    JTable example1 = new JTable ();//看不到但存在    JTable example2 = new JTable (8, 6);      final Object[] columnNames = {"姓名", "性别", "家庭地址",//列名最好用final修饰   "电话号码", "生日", "工作", "收入", "婚姻状况","恋爱状况"};  Object[][] rowData = {     {"ddd", "男", "江苏南京", "1378313210", "03/24/1985", "学生", "寄生中", "未婚", "没"},     {"eee", "女", "江苏南京", "13645181705", "xx/xx/1985", "家教", "未知", "未婚", "好象没"},......

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JTabbedPane用法(2005-09-22 17:18:00)

摘要:import java.awt.FlowLayout;import java.awt.GridLayout;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import javax.swing.BoxLayout;import javax.swing.JTabbedPane;import javax.swing.JPanel;import javax.swing.JFrame;import javax.swing.JButton;import javax.swing.ImageIcon;import javax.swing.UIManager; class TabPane extends JTabbedPane{ JPanel panel1, panel2, panel3, panel4, panel5;  public TabPane () {  //super (a, b);  panel1 = new JPanel ();  panel1.add(new JButton());  panel2 = new JPanel (new BorderLayout());  panel3 = new JPanel (true);  panel4 = new JPanel (new GridLayout(2,3));  panel5 = new JPanel (new FlowLayout(FlowLayout.LEFT, 1, 0));  //以上是JPanel的四种构造方法  //窗体布局器有四种设置:  //new BorderLayout () or new BorderLayout (int hgap, int vgap)  //new GridLayout () or new GridLayout (int rows, int cols) new GridLayout (int rows, int ......

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全面认识JAVA[转](2005-09-20 22:57:00)

摘要: 全面认识JAVA 作者:刘静    来自:沈阳银河网络教育中心 作SCJP培训已经有一段时间了,到我这学习的有在校的大学生,也有在职的开发人员。通常这些学员此前都对Java已有一些了解,但普遍对Java缺乏总体的认识。于是学员总是问,Java应该怎么学?Java能做什么?什么是Applet?什么是Servlet、Jsp、EJB?还有Webspere、Weblogic又是做什么的等等。之所以学员会有这些疑问,是因为大家普遍对Java相关概念听说的太多而了解的又相对少的缘故。 学通Java语言需要一个过程,所有Java相关的概念都会在学习的过程中逐渐变得清昕。这个过程的开始就是要先学会标准的Java技术(J2SE),然后是学Java的简单Web运用,然后分布式运用,再以后对Java的移动技术运用就很容易理解了。 以下是Java标准技术的一些要点: 一、Java的跨平台性,即一次编译到处运行 简单地说Java的跨平台性就是指,编译后的Java程序可直接在不同的平台上运行而不用重新编译,这一特性使得Java随着Web应用的普及而迅速普及起来。而Java的跨平台性是如何实现的呢?这就要理解Java虚拟机和字节码的概念。   实际上,编译后的Java代码并不是传统的二进制代码(如Windows下的.exe文件),而是Java字节码,这种字节码文件是不能直接在操作系统上执行的。要想在一个操作系统上运行一个Java程序必须有一个中间环节来负责将Java字节码解释成二进制码,这个中间环节就是Java虚拟机(简称JVM)。由于目前大多数操作系统已经实现了JVM,所以Java轻松实现跨平台性。   二、面象对象技术   Java全面支持面象对象技术,这体现在Class(类)是Java程序构成的基本单元,一个Java程序通常由许多Class组成,而且这些Class还会有一定的继承关系,Java支持Class的单继承,从而使类之间的继承关系更明确。继承的结果产生类的多态性,类的多态本质上讲就是可以用父类的引用访问继承类的实现(子类对象),类的这种多态性最终形成了组件对象模型的基础,即通过接口(父类)访问实现(子类)。   三、Java中的I/O操作   Java中以字......

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JTabbeld用法(2005-09-18 17:23:00)

摘要:import java.awt.FlowLayout;import java.awt.GridLayout;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import javax.swing.BoxLayout;import javax.swing.JTabbedPane;import javax.swing.JPanel;import javax.swing.JFrame;import javax.swing.JButton;import javax.swing.ImageIcon;import javax.swing.UIManager; class TabPane extends JTabbedPane{ JPanel panel1, panel2, panel3, panel4, panel5;  public TabPane () {  //super (a, b);  panel1 = new JPanel ();  panel1.add(new JButton());  panel2 = new JPanel (new BorderLayout());  panel3 = new JPanel (true);  panel4 = new JPanel (new GridLayout(2,3));  panel5 = new JPanel (new FlowLayout(FlowLayout.LEFT, 1, 0));  //以上是JPanel的四种构造方法  //窗体布局器有四种设置:  //new BorderLayout () or new BorderLayout (int hgap, int vgap)  //new GridLayout () or new GridLayout (int rows, int cols) new GridLayout (int rows, int ......

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JSplitPane用法(2005-09-18 17:23:00)

摘要:import javax.swing.*;import java.awt.Dimension;public class JSplitPaneDemo{ public static void main (String[] args) {    JButton button = new JButton ("button");  JLabel label = new JLabel ("label");    JSplitPane splitPane = new JSplitPane ();  splitPane.setOneTouchExpandable (true);//是该分隔面板的分隔条显示出箭头  splitPane.setContinuousLayout (true);  splitPane.setPreferredSize (new Dimension (500,600));//设置大小  splitPane.setOrientation (JSplitPane.HORIZONTAL_SPLIT);  splitPane.setLeftComponent (button);//same as: splitPane.setTopComponent(button);  splitPane.setRightComponent (label);//same as: splitPane.setBottomComponent(label);  splitPane.setDividerSize (5);//设置分隔条的粗细  splitPane.setDividerLocation(200);//设置分隔条的位置,基于setPreferredSize方法中的值,           //此处为200/500,大概在中间靠左   JFrame frame = new JF......

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JSlider用法(2005-09-18 17:22:00)

摘要:import java.awt.Color;import javax.swing.JSlider;import javax.swing.JFrame;import javax.swing.JPanel;import java.awt.Dimension;import java.awt.GridLayout; public class JSliderDemo{ public static void main (String[] args) {  JSlider empty = new JSlider ();    JSlider age = new JSlider (JSlider.VERTICAL, 0, 150, 20);//设置方向,最小值,最大值,初始值    JSlider append = new JSlider ();  append.setOrientation (JSlider.HORIZONTAL);//设置方向  append.setMinimum (0);//设置最小值  append.setMaximum (100);//设置最大值  append.setMajorTickSpacing (20);//设置主标号间隔  append.setMinorTickSpacing (5);//设置辅标号间隔  append.setPaintLabels (true);//Default:false显示标签  append.setPaintTicks (true);//Default:false显示标号  append.setPaintTrack (true);//Determines whether the track is painted on the slider  append.setValue (0);//设置初始值      JPanel panel = new JPanel (new......

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