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package br.ufop.marina.teste;
 
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
 
import java.util.ArrayList;
 
/**
 * Created by Marina on 09/11/2017.
 */
 
public class MainStudent extends Activity {
 
    private ArrayList<Student> students = new ArrayList<Student>();
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        setContentView(R.layout.main_student);
        super.onCreate(savedInstanceState);
 
    }
 
    public void list(View view){
        Intent it = new Intent(this, StudentList.class);
        it.putExtra("students", students);
        startActivityForResult(it, 1);
    }
 
    public void call(View view){
        Intent it = new Intent(this, StudentCall.class);
        it.putExtra("students", students);
        startActivity(it);
    }
 
    public void add(View view){
        Intent it = new Intent(this, StudentAdd.class);
        it.putExtra("students", students);
        startActivityForResult(it, 1);
    }
 
    @Override
    protected void onActivityResult(int code, int result, Intent it) {
        super.onActivityResult(code, result, it);
        if(code == 1) {
            if (it != null) {
                students = it.getParcelableArrayListExtra("students");
            }
        }
        if (code == 2){
            if (it != null) {
                students = it.getParcelableArrayListExtra("students");
            }
 
        }
        if (code == 3){
 
        }
    }
 
 
}
 

Main.java:14: error: class MainStudent is public, should be declared in a file named MainStudent.java
public class MainStudent extends Activity {
       ^
Main.java:3: error: package android.app does not exist
import android.app.Activity;
                  ^
Main.java:4: error: package android.content does not exist
import android.content.Intent;
                      ^
Main.java:5: error: package android.os does not exist
import android.os.Bundle;
                 ^
Main.java:6: error: package android.view does not exist
import android.view.View;
                   ^
Main.java:14: error: cannot find symbol
public class MainStudent extends Activity {
                                 ^
  symbol: class Activity
Main.java:16: error: cannot find symbol
    private ArrayList<Student> students = new ArrayList<Student>();
                      ^
  symbol:   class Student
  location: class MainStudent
Main.java:19: error: cannot find symbol
    protected void onCreate(Bundle savedInstanceState) {
                            ^
  symbol:   class Bundle
  location: class MainStudent
Main.java:25: error: cannot find symbol
    public void list(View view){
                     ^
  symbol:   class View
  location: class MainStudent
Main.java:31: error: cannot find symbol
    public void call(View view){
                     ^
  symbol:   class View
  location: class MainStudent
Main.java:37: error: cannot find symbol
    public void add(View view){
                    ^
  symbol:   class View
  location: class MainStudent
Main.java:44: error: cannot find symbol
    protected void onActivityResult(int code, int result, Intent it) {
                                                          ^
  symbol:   class Intent
  location: class MainStudent
Main.java:16: error: cannot find symbol
    private ArrayList<Student> students = new ArrayList<Student>();
                                                        ^
  symbol:   class Student
  location: class MainStudent
Main.java:18: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:20: error: package R does not exist
        setContentView(R.layout.main_student);
                        ^
Main.java:21: error: cannot find symbol
        super.onCreate(savedInstanceState);
        ^
  symbol:   variable super
  location: class MainStudent
Main.java:26: error: cannot find symbol
        Intent it = new Intent(this, StudentList.class);
        ^
  symbol:   class Intent
  location: class MainStudent
Main.java:26: error: cannot find symbol
        Intent it = new Intent(this, StudentList.class);
                        ^
  symbol:   class Intent
  location: class MainStudent
Main.java:26: error: cannot find symbol
        Intent it = new Intent(this, StudentList.class);
                                     ^
  symbol:   class StudentList
  location: class MainStudent
Main.java:32: error: cannot find symbol
        Intent it = new Intent(this, StudentCall.class);
        ^
  symbol:   class Intent
  location: class MainStudent
Main.java:32: error: cannot find symbol
        Intent it = new Intent(this, StudentCall.class);
                        ^
  symbol:   class Intent
  location: class MainStudent
Main.java:32: error: cannot find symbol
        Intent it = new Intent(this, StudentCall.class);
                                     ^
  symbol:   class StudentCall
  location: class MainStudent
Main.java:38: error: cannot find symbol
        Intent it = new Intent(this, StudentAdd.class);
        ^
  symbol:   class Intent
  location: class MainStudent
Main.java:38: error: cannot find symbol
        Intent it = new Intent(this, StudentAdd.class);
                        ^
  symbol:   class Intent
  location: class MainStudent
Main.java:38: error: cannot find symbol
        Intent it = new Intent(this, StudentAdd.class);
                                     ^
  symbol:   class StudentAdd
  location: class MainStudent
Main.java:43: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:45: error: cannot find symbol
        super.onActivityResult(code, result, it);
        ^
  symbol:   variable super
  location: class MainStudent
27 errors

Standard output is empty