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| // java 序列化与反序列化demo // 导入反序列化所需要的包 /* import javax.naming.event.ObjectChangeListener; import java.io.*;
class user implements java.io.Serializable{ public String name; public String id; public void OutInfo(){ System.out.println(this.name+this.id); } }
public class test { public static void main(String[] args){ user ldd = new user(); ldd.name = "tommonkey"; ldd.id = "10086"; System.out.println(ldd.id);
try { // 进行序列化,会在当前目录下生成一个序列化文件 FileOutputStream fileOut = new FileOutputStream("./serial.txt"); // 打开文件流 ObjectOutputStream objOut = new ObjectOutputStream(fileOut); // 创建对象流 objOut.writeObject(ldd); // 输出序列化对象 objOut.close(); // 关闭 fileOut.close(); System.out.println("serial is over!");
// 进行反序列化 user n = null; FileInputStream fileIn = new FileInputStream("./serial.txt"); ObjectInput objIn = new ObjectInputStream(fileIn); n = (user) objIn.readObject(); objIn.close(); fileIn.close(); System.out.println(n.name+n.id); }catch (IOException i){ i.printStackTrace(); return; }catch (ClassNotFoundException a){ System.out.println("Employee class not found"); a.printStackTrace(); return; } } } */
// Runtime.getRuntime().exec():系统命令执行方法 /* public class test { public static void main(String[] args) throws Exception{ Runtime.getRuntime().exec("notepad.exe"); // 打开记事本 } } */
// applet,awt-GUI界面响应事件流程demo // 启动方法,再html页面中设置此class文件的路径名,再cmd启动:AppletViewer ****.html // html中添加路径的方法:<APPLET CODE="test.class" width=500 height=500></APPLET> /* import sun.security.mscapi.CPublicKey;
import java.applet.*; import java.awt.*; import java.awt.event.*;
public class test extends Applet implements ActionListener{ // 继承appelt 且实现接口:动作监听 private Button but1,but2; int button = 0; public void init(){ but1 = new Button("按钮1"); but2 = new Button("按钮2"); add(but1); // 注册事件监听 add(but2); but1.addActionListener(this); // 事件监听本对象:but1 but2.addActionListener(this); } public void paint(Graphics g){ if(button==1) g.drawString("事件监听到你选择了按钮1!",10,20); else if(button==2) g.drawString("事件监听到你选择了按钮2!",10,20); } public void actionPerformed(ActionEvent e){ // 实现动作监听必须要有实现该方法 if(e.getActionCommand().equals("按钮1")) button = 1; else if(e.getActionCommand().equals("按钮2")) button =2; repaint(); } } */
// applet的文本框textField与文本区textArea演示 /* import java.applet.*; import java.awt.*; import java.awt.event.*;
public class test extends Applet implements ActionListener,TextListener{ TextArea ta1,ta2; // 创建两个文本区对象 TextField text1; // 创建一个文本框对象 public void init() { text1 = new TextField("this is textField!", 30); text1.addActionListener(this); text1.addTextListener(this); add(text1);
ta1 = new TextArea("this is textArea!", 100, 100); ta1.addTextListener(this); add(ta1); ta2 = new TextArea("this is orther textArea!", 100, 100); ta2.addTextListener(this); add(ta2); } public void actionPerformed(ActionEvent e){ ta1.append("we have capture you action event and output here!\n"); repaint(); //刷新 } public void textValueChanged(TextEvent e){ ta2.append("we have capture you action event and output here!\n"); repaint(); } } */ // Appl的单选框与列表demo /* import java.applet.*; import java.awt.*; import java.awt.event.*;
public class test extends Applet implements ItemListener{ CheckboxGroup cbk; Checkbox cb1,cb2,cb3,cb4; Color showColor; List ls; String[] colorName={"red","yellow","blue","black"}; String[] setColor={String.valueOf(Color.red), String.valueOf(Color.yellow), String.valueOf(Color.blue), String.valueOf(Color.black)}; int num;
public void init(){ cbk = new CheckboxGroup(); cb1 = new Checkbox("Red",cbk,true); cb2 = new Checkbox("Yellow",cbk,false); cb3 = new Checkbox("Blue",cbk,false); cb4 = new Checkbox("Black",cbk,false); showColor = Color.red; cb1.addItemListener(this); cb2.addItemListener(this); cb3.addItemListener(this); cb4.addItemListener(this); add(cb1); add(cb2); add(cb3); add(cb4);
ls = new List(4,false); for(int i=0;i<colorName.length;i++){ ls.add(colorName[i]); } ls.addItemListener(this); add(ls); }
public void itemStateChanged(ItemEvent e){ if (e.getSource() == cb1){ showColor = Color.red; // getSource()方法:返回当前动作所指向的对象,包含对象的所有信息,而getActionCommond()是指当前动作指向的对象的名称 } if (e.getSource() == cb2){ showColor = Color.yellow; } if (e.getSource() == cb3){ showColor = Color.blue; } if (e.getSource() == cb4){ showColor = Color.black; }
// showStatus()方法:打印一行状态信息 showStatus(ls.getSelectedItem()+":序列号为 "+ls.getSelectedIndex()); num = ls.getSelectedIndex(); repaint(); }
public void paint(Graphics g){ g.setColor(showColor); g.fillRect(50,80,50,50);
g.setColor(Color.decode(setColor[num])); // 这里的类型转化出了问题,我没找解决办法 g.fillOval(270,100,50,50); } } */ // 容器Panel(面板):无边框容器,没有边框,也不能移动,缩放,和关闭,通常作为一个容器组件被加到其他容器中 /* import java.applet.*; import java.awt.*; import java.awt.event.*;
public class test extends Applet implements ActionListener,ContainerListener{ Button but1,but2; Label lab1,lab2,lab3,lab4,lab5; Panel pan1,pan2,pan3,pan4,pan5; // 创建五个panel容器(面板) public void init(){ pan1 = new Panel(); pan2 = new Panel(); pan3 = new Panel(); pan4 = new Panel(); pan5 = new Panel(); pan1.setBackground(Color.red); // 设置面板背景颜色 pan2.setBackground(Color.yellow); pan3.setBackground(Color.black); pan4.setBackground(Color.blue); pan5.setBackground(Color.green);
lab1 = new Label("this is red panel"); lab2 = new Label("this is yellow panel"); lab3 = new Label("this is black panel"); lab4 = new Label("this is blue panel"); lab5 = new Label("this is green panel");
but1 = new Button("this is button1"); but2 = new Button("this is button2");
pan1.add(lab1); // 将标签添加到panel上 pan2.add(lab2); pan3.add(lab3); pan4.add(lab4); pan5.add(lab5);
pan3.add(but1); // 将按钮添加到panel上 pan4.add(but2);
pan1.add(pan3); pan2.add(pan4);
add(pan1); // 将panel添加到容器中 add(pan2); add(pan5);
but1.addActionListener(this); but2.addActionListener(this);
pan1.addContainerListener(this); pan2.addContainerListener(this); }
public void actionPerformed(ActionEvent e){ if (e.getSource() == but1){ pan1.remove(pan3); showStatus("remove panel3 in panel1"); }else{ pan2.remove(pan4); showStatus("remove panel4 in panel2"); } }
public void componentRemoved(ContainerEvent e){
}
public void componentAdded(ContainerEvent e){
} } */
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