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首先，说说final。
final关键字可以修饰变量，方法，类。
private Random rand=new Random();
private static Random random=new Random();
private final int n1=12;
private final int number=rand.nextInt(30);
private static final int NUMBER2=random.nextInt(40);
@Test
public void finalDataTest(){
System.out.println(n1);
System.out.println("--------------------");
System.out.println(rand.nextInt(30));
System.out.println("--------------------");
System.out.println("编译初始之后，不会改变："+number);
System.out.println("--------------------");
System.out.println("编译初始之后，不会改变："+NUMBER2);
}
/**
* final修饰参数：该参数可读，但无法修改。
* @param sk
* @return
*/
public String finalParam(final String sk){
//sk="jeyson"; final参数不能被修改
return sk;
}
public final String finalMethod(){
return "Hello World" ;
}
public final class FinalClassTx {
private int k ;
public void getMyWord(){
System. out .println("这是一个final类，k的值是" +getK());
}
public int getK() {
return k ;
}
public void setK( int k) {
this .k = k;
}
}
然后 transient关键字：
public class TransientEx {
public static void main(String[] args) {
User user=new User();
user.setUsername("jeyson");
user.setPassword("123456");
System.out.println("序列化前：");
System.out.println(" username="+user.getUsername());
System.out.println(" password="+user.getPassword());
//序列化
try {
ObjectOutputStream os=new ObjectOutputStream(new FileOutputStream("C://MyResource//test1.txt"));
os.writeObject(user);
os.flush();
os.close();
} catch (Exception e) {
e.printStackTrace();
}
//反序列化
try {
ObjectInputStream is=new ObjectInputStream(new FileInputStream("C://MyResource//test1.txt"));
user=(User) is.readObject();
is.close();
System.out.println("序列化后：");
System.out.println(" username="+user.getUsername());
System.out.println(" password="+user.getPassword());
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("--------------------------------");
}
}
class User implements Serializable{
private static final long serialVersionUID = 1L;
private String username;
//使用 transient
private transient String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
扩展：Externalizable
实现了serializable接口的类，所以序列化会自动进行
public class ExternalizableEx implements Externalizable {
private transient String name="ssss";
@Override
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
name=(String) in.readObject();
}
@Override
public void writeExternal(ObjectOutput out) throws IOException {
out.writeObject(name);
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public static void main(String[] args) {
ExternalizableEx ex=new ExternalizableEx();
ex.setName("jeyson");
System.out.println("Externalizable序列化前:");
System.out.println(ex.getName());
//序列化
try {
ObjectOutputStream os=new ObjectOutputStream(new FileOutputStream(new File("C://MyResource//test2.txt")));
os.writeObject(ex);
os.flush();
os.close();
} catch (Exception e) {
e.printStackTrace();
}
//反序列化
try {
ObjectInputStream is=new ObjectInputStream(new FileInputStream(new File("C://MyResource//test2.txt")));
ex=(ExternalizableEx) is.readObject();
is.close();
System.out.println("Externalizable序列化后:");
System.out.println(ex.getName());
} catch (Exception e) {
e.printStackTrace();
}
}
}
声明：
final大部分来自《java编程思想》第四版
transient相关部分参考自：http://www.cnblogs.com/lanxuezaipiao/p/3369962.html
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原文地址：http://www.cnblogs.com/jeyson/p/5601259.html
