Learning of serialVersionUID and serialization of fields in ArrayList

Abnormal.

class TestSeriable implements Externalizable {

public transient String name;

public  String pwd;

public int age;

public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public String getPwd() {
    return pwd;
}

public void setPwd(String pwd) {
    this.pwd = pwd;
}
public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}
//序列化对象
@Override
public void writeExternal(ObjectOutput out) throws IOException {
    out.writeObject(name);
    out.writeObject(pwd);
    out.writeInt(age);
}

//反序列化对象
@Override
public void readExternal(ObjectInput in) throws IOException,ClassNotFoundException {
    name=(String)in.readObject();
    pwd=(String)in.readObject();
    age=in.readInt();
}
//被序列化的类：必有<a href="https://www.jb51.cc/tag/publiclei/" target="_blank" class="keywords">public类</a>型的无参构造器。因反序列化时，先<a href="https://www.jb51.cc/tag/diaoyong/" target="_blank" class="keywords">调用</a>此<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>实例化<a href="https://www.jb51.cc/tag/yige/" target="_blank" class="keywords">一个</a>类，再<a href="https://www.jb51.cc/tag/diaoyong/" target="_blank" class="keywords">调用</a>readExternal<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>读取<a href="https://www.jb51.cc/tag/shuxing/" target="_blank" class="keywords">属性</a>值。
public TestSeriable(){
}
}
public class Main {

public static void main(String[] args) throws Exception{

//Scanner scanner=new Scanner(system.in);//在线笔试

TestSeriable ts=new TestSeriable();

ts.setName("cxh");

ts.setPwd("123456");

ts.setAge(3);

//序列化

ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("test"));

out.writeObject(ts);
    //反序列化
    ObjectInputStream in = new ObjectInputStream(new FileInputStream("test"));
    ts = (TestSeriable)in.readObject();

    //<a href="https://www.jb51.cc/tag/shuchu/" target="_blank" class="keywords">输出</a>:
    Sy<a href="https://www.jb51.cc/tag/stem/" target="_blank" class="keywords">stem</a>.out.println("name:"+ts.name);
    Sy<a href="https://www.jb51.cc/tag/stem/" target="_blank" class="keywords">stem</a>.out.println("pwd:"+ts.pwd);
    Sy<a href="https://www.jb51.cc/tag/stem/" target="_blank" class="keywords">stem</a>.out.println("age:"+ts.age);

    //<a href="https://www.jb51.cc/tag/guanbi/" target="_blank" class="keywords">关闭</a>连接
    out.close();
    in.close();
}
}



<code class="language-java"><span style="font-size:14px;">name:cxh

pwd:123456

age:3

Process finished with exit code 0
class TestSeriable implements Serializable {

private  static  final long serialVersionUID=1L;

private String name;

private int age;

private transient  String pwd;

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}

public String getPwd() {
    return pwd;
}

public void setPwd(String pwd) {
    this.pwd = pwd;
}
}
public class Main {

public static void main(String[] args) throws Exception{

//Scanner scanner=new Scanner(system.in);//在线笔试

TestSeriable test=new TestSeriable();

test.setAge(27);

test.setName("cxh");

test.setPwd("123456");
    ObjectOutputStream  oos=new ObjectOutputStream(new FileOutputStream("file.txt"));
    oos.writeObject(test);
    oos.close();

    ObjectInputStream ois=new ObjectInputStream(new FileInputStream("file.txt"));
    TestSeriable ts=(TestSeriable) ois.readObject();//readObject返回final类型的Object对象,需要强制转化
    Sy<a href="https://www.jb51.cc/tag/stem/" target="_blank" class="keywords">stem</a>.out.println("my name:"+ts.getName());
    Sy<a href="https://www.jb51.cc/tag/stem/" target="_blank" class="keywords">stem</a>.out.println("my age:"+ts.getAge());
    Sy<a href="https://www.jb51.cc/tag/stem/" target="_blank" class="keywords">stem</a>.out.println("my pwd:"+ts.getPwd());


}
}



Process finished with exit code 0


class TestSeriable implements Serializable {

private String name;

private int age;

private transient  String pwd;

private String school;//新增字段

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}

public String getPwd() {
    return pwd;
}

public void setPwd(String pwd) {
    this.pwd = pwd;
}
public String getSchool() {
    return school;
}

public void setSchool(String school) {
    this.school = school;
}
}
public class Main {

public static void main(String[] args) throws Exception{

//Scanner scanner=new Scanner(system.in);//在线笔试

TestSeriable test=new TestSeriable();

test.setAge(27);

test.setName("cxh");

test.setPwd("123456");
//        ObjectOutputStream  oos=new ObjectOutputStream(new FileOutputStream("file.txt"));

//        oos.writeObject(test);

//        oos.close();
    ObjectInputStream ois=new ObjectInputStream(new FileInputStream("file.txt"));
    TestSeriable ts=(TestSeriable) ois.readObject();//readObject返回final类型的Object对象,需要强制转化
    Sy<a href="https://www.jb51.cc/tag/stem/" target="_blank" class="keywords">stem</a>.out.println("my name:"+ts.getName());
    Sy<a href="https://www.jb51.cc/tag/stem/" target="_blank" class="keywords">stem</a>.out.println("my age:"+ts.getAge());
    Sy<a href="https://www.jb51.cc/tag/stem/" target="_blank" class="keywords">stem</a>.out.println("my pwd:"+ts.getPwd());


}
}



Process finished with exit code 1
class TestSeriable implements Serializable {

private  static  final long serialVersionUID=1L;

private String name;

private int age;

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}
public static long getSerialVersionUIDs() {
    return serialVersionUIDs;
}
}
public class Main {

public static void main(String[] args) throws Exception{

//Scanner scanner=new Scanner(system.in);//在线笔试

TestSeriable test=new TestSeriable();

test.setAge(27);

test.setName("cxh");
    ObjectOutputStream  oos=new ObjectOutputStream(new FileOutputStream("file1.txt"));
    oos.writeObject(test);
    oos.close();

    ObjectInputStream ois=new ObjectInputStream(new FileInputStream("file1.txt"));
    TestSeriable ts=(TestSeriable) ois.readObject();//readObject返回final类型的Object对象,需要强制转化
    Sy<a href="https://www.jb51.cc/tag/stem/" target="_blank" class="keywords">stem</a>.out.println("my name:"+ts.getName());
    Sy<a href="https://www.jb51.cc/tag/stem/" target="_blank" class="keywords">stem</a>.out.println("my age:"+ts.getAge());
}
}



Process finished with exit code 0
class TestSeriable implements Serializable {

private  static  final long serialVersionUID=1L;

private String name;

private int age;

private String address;//新增字段

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}
//新增<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>
public String getAddress() {
    return address;
}
public void setAddress(String address) {
    this.address = address;
}
}
public class Main {

public static void main(String[] args) throws Exception{

//Scanner scanner=new Scanner(system.in);//在线笔试

TestSeriable test=new TestSeriable();

test.setAge(27);

test.setName("cxh");
    ObjectOutputStream  oos=new ObjectOutputStream(new FileOutputStream("file.txt"));
    oos.writeObject(test);
    oos.close();

    ObjectInputStream ois=new ObjectInputStream(new FileInputStream("file.txt"));
    TestSeriable ts=(TestSeriable) ois.readObject();//readObject返回final类型的Object对象,需要强制转化
    Sy<a href="https://www.jb51.cc/tag/stem/" target="_blank" class="keywords">stem</a>.out.println("my name:"+ts.getName());
    Sy<a href="https://www.jb51.cc/tag/stem/" target="_blank" class="keywords">stem</a>.out.println("my age:"+ts.getAge());
}
}



Process finished with exit code 0
class TestSeriable implements Serializable {

private  static  final long serialVersionUID=1L;

private String name;

private int age;

private static String address;//更改类型为static字段

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}
//新增<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>
public String getAddress() {
    return address;
}
public void setAddress(String address) {
    this.address = address;
}
}
public class Main {

public static void main(String[] args) throws Exception{

//Scanner scanner=new Scanner(system.in);//在线笔试

TestSeriable test=new TestSeriable();

test.setAge(27);

test.setName("cxh");

test.setAddress("海淀");
    ObjectOutputStream  oos=new ObjectOutputStream(new FileOutputStream("file.txt"));
    oos.writeObject(test);
    oos.close();
//        ObjectInputStream ois=new ObjectInputStream(new FileInputStream("file.txt"));

//        TestSeriable ts=(TestSeriable) ois.readObject();//readObject返回final类型的Object对象,需要强制转化

//        System.out.println("my name:"+ts.getName());

//        System.out.println("my age:"+ts.getAge());

//        System.out.println("my address:"+ts.getAddress());

}

}



class TestSeriable implements Serializable {

private  static  final long serialVersionUID=1L;

private String name;

private int age;

private static String address;//更改类型为static字段

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}
//新增<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>
public String getAddress() {
    return address;
}
public void setAddress(String address) {
    this.address = address;
}
}
public class Main {

public static void main(String[] args) throws Exception{

//Scanner scanner=new Scanner(system.in);//在线笔试

//        TestSeriable test=new TestSeriable();

//        test.setAge(27);

//        test.setName("cxh");

//        test.setAddress("海淀");

//

//        ObjectOutputStream  oos=new ObjectOutputStream(new FileOutputStream("file.txt"));

//        oos.writeObject(test);

//        oos.close();
    ObjectInputStream ois=new ObjectInputStream(new FileInputStream("file.txt"));
    TestSeriable ts=(TestSeriable) ois.readObject();//readObject返回final类型的Object对象,需要强制转化
    Sy<a href="https://www.jb51.cc/tag/stem/" target="_blank" class="keywords">stem</a>.out.println("my name:"+ts.getName());
    Sy<a href="https://www.jb51.cc/tag/stem/" target="_blank" class="keywords">stem</a>.out.println("my age:"+ts.getAge());
    Sy<a href="https://www.jb51.cc/tag/stem/" target="_blank" class="keywords">stem</a>.out.println("my address:"+ts.getAddress());
}
}



Process finished with exit code 0