By implementing the Serializable interface

Using the features of the Java language itself, it is passed through the serialization of the data.

Entity class:

public class Person implements Serializable {

    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;
    }
}

1, set the parameters

//1. Example of passing parameters via the Serializable interface
        //HashMap<String,String> map2 = new HashMap<>();
        //map2.put("key1", "value1");
        //map2.put("key2", "value2");
        //Bundle bundleSerializable = new Bundle();
        //bundleSerializable.putSerializable("serializable", map2);
        //Intent intentSerializable = new Intent();
        //intentSerializable.putExtras(bundleSerializable);
        //intentSerializable.setClass(MainActivity.this,
        //SerializableActivity.class);
        //startActivity(intentSerializable);

                 //2. Passing the entity class through the Serializable interface
        Person person = new Person();
        person.setAge(25);
        person.setName("lyx");
        Intent intent2 = new Intent(MainActivity.this, SerializableActivity.class);
        intent2.putExtra("serializable", person);
        startActivity(intent2);

2, receiving parameters

this.setTitle("Serializable example");

     / / Receive parameters

     //1. Receive collection
// Bundle bundle = this.getIntent().getExtras();
 / / If LinkedHashMap, then bundle.getSerializable will report ClassCastException, do not know why
 // There is no problem with passing HashMap.
//HashMap<String, String> map = (HashMap<String, String>) bundle.getSerializable("serializable");
//
//String sResult = "map.size() =" + map.size();
//
//Iterator iter = map.entrySet().iterator();
//  while (iter.hasNext()) {
//  Map.Entry entry = (Map.Entry) iter.next();
//   Object key = entry.getKey();
//  Object value = entry.getValue();
//  //System.out.println("key---->"+ (String)key);
//  //System.out.println("value---->"+ (String)value);
//
//  sResult += "\r\n key----> " + (String) key;
//  sResult += "\r\n value----> " + (String) value;
//    }

     //2. Receive entity class
  Person person = (Person) getIntent().getSerializableExtra("serializable");
     String sResult = "Name:" + person.getName() + "--age:" + person.getAge();

  TextView tv = findViewById(R.id.tv);
  tv.setText(sResult);