How to pass data one activity to another activity?

Intent intent=new Intent(context,AnotherClassName);
intent.putExtra(key, value);
startActivity(intent);

Intent intent=getIntent();
String str=intent.getStringExra(Key);

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.msclient009.opennewactivity.FirstMainActivity">
    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText"
        android:layout_alignParentTop="true"
        android:layout_alignStart="@+id/editText"
        android:layout_marginTop="49dp"
        android:text="This is First Activity"
        android:textColor="#f00"
        android:textSize="20dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    <EditText
        android:id="@+id/editText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="79dp"
        android:hint="Enter Your Name...." />
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/editText"
        android:layout_marginLeft="25dp"
        android:layout_marginStart="25dp"
        android:layout_marginTop="63dp"
        android:text="Click Here to open new Activity and Send Your Name" />
</RelativeLayout>

package com.example.msclient009.opennewactivity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class FirstMainActivity extends AppCompatActivity {
    EditText editText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_first_main);
        Button button=(Button)findViewById(R.id.button1);
         editText=(EditText)findViewById(R.id.editText);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String str=editText.getText().toString();
                Intent intent=new Intent(FirstMainActivity.this, NewMainActivity.class);
                intent.putExtra("Name", str);
                startActivity(intent);
            }
        });
    }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="110dp"
        android:text="This is Second Activity"
        android:textColor="#00f"
        android:textSize="30dp" />
    <TextView
        android:id="@+id/textView2"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_alignEnd="@+id/textView1"
        android:layout_alignRight="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginEnd="46dp"
        android:layout_marginRight="46dp"
        android:textColor="#fff"
        android:layout_marginTop="60dp"
        android:background="#f00"
        android:text="Arti mishra"
        android:textSize="30dp" />
</RelativeLayout>

package com.example.msclient009.opennewactivity;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
public class FirstMainActivity extends Activity {
 TextView textView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second_main);
        textView=(TextView)findViewById(R.id.textView2);
        Intent intent=getIntent();
        String str = intent.getStringExtra("Name");
        textView.setText(str);
    }
}