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public class Person implements java.io.Serializable{
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    private String name;
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    private int age;
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    public Person() {
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    }
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    public Person(String name, int age) {
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        this.name = name;
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        this.age = age;
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    }
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    @Override
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    public String toString() {
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        return "Person{" +
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                "name='" + name + '\'' +
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                ", age=" + age +
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                '}';
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    }
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}

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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.ObjectOutputStream;
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public class SerializationTest {
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    public static void serialize(Object obj) throws IOException {
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        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("ser.bin"));
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        oos.writeObject(obj);
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    }
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    public static void main(String[] args) throws Exception {
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        Person person = new Person("aa", 22);
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        System.out.println(person);
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        //  SerializationTest.serialize(person);
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    }
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}