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package com.test;
 
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
 
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
 
 
 
public class MainActivity extends AppCompatActivity {
    int k1;
    int k2;
    String key_name="key1";
    String key_name2="key2";
    TextView key1;
    TextView key2;
    Button jump,reset;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        key1=(TextView)findViewById(R.id.key1);
        key2=(TextView)findViewById(R.id.key2);
 
        SharedPreferences mPrefernece= PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
        k2=mPrefernece.getInt(key_name2,0);
        k1=mPrefernece.getInt(key_name,0);
        key1.setText(""+k1);
        key2.setText(""+k2);
        final SharedPreferences.Editor medit=mPrefernece.edit();
 
        jump=(Button)findViewById(R.id.jump);
        jump.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                medit.putInt(key_name,++k1);
                medit.putInt(key_name2,--k2);
                medit.commit();
                key1.setText(""+k1);
                key2.setText(""+k2);
            }
        });
 
        reset=(Button)findViewById(R.id.reset);
        reset.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                medit.remove(key_name).apply();
                medit.remove(key_name2);
                medit.commit();
                key1.setText("" + 0);
                key2.setText("" + 0);
            }
        });
    }
}

Main.java:15: error: class MainActivity is public, should be declared in a file named MainActivity.java
public class MainActivity extends AppCompatActivity {
       ^
Main.java:3: error: package android.content does not exist
import android.content.SharedPreferences;
                      ^
Main.java:4: error: package android.preference does not exist
import android.preference.PreferenceManager;
                         ^
Main.java:6: error: package android.support.v7.app does not exist
import android.support.v7.app.AppCompatActivity;
                             ^
Main.java:7: error: package android.os does not exist
import android.os.Bundle;
                 ^
Main.java:9: error: package android.view does not exist
import android.view.View;
                   ^
Main.java:10: error: package android.widget does not exist
import android.widget.Button;
                     ^
Main.java:11: error: package android.widget does not exist
import android.widget.TextView;
                     ^
Main.java:15: error: cannot find symbol
public class MainActivity extends AppCompatActivity {
                                  ^
  symbol: class AppCompatActivity
Main.java:20: error: cannot find symbol
    TextView key1;
    ^
  symbol:   class TextView
  location: class MainActivity
Main.java:21: error: cannot find symbol
    TextView key2;
    ^
  symbol:   class TextView
  location: class MainActivity
Main.java:22: error: cannot find symbol
    Button jump,reset;
    ^
  symbol:   class Button
  location: class MainActivity
Main.java:25: error: cannot find symbol
    protected void onCreate(Bundle savedInstanceState) {
                            ^
  symbol:   class Bundle
  location: class MainActivity
Main.java:24: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:26: error: cannot find symbol
        super.onCreate(savedInstanceState);
        ^
  symbol:   variable super
  location: class MainActivity
Main.java:27: error: package R does not exist
        setContentView(R.layout.activity_main);
                        ^
Main.java:29: error: cannot find symbol
        key1=(TextView)findViewById(R.id.key1);
              ^
  symbol:   class TextView
  location: class MainActivity
Main.java:29: error: package R does not exist
        key1=(TextView)findViewById(R.id.key1);
                                     ^
Main.java:30: error: cannot find symbol
        key2=(TextView)findViewById(R.id.key2);
              ^
  symbol:   class TextView
  location: class MainActivity
Main.java:30: error: package R does not exist
        key2=(TextView)findViewById(R.id.key2);
                                     ^
Main.java:32: error: cannot find symbol
        SharedPreferences mPrefernece= PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
        ^
  symbol:   class SharedPreferences
  location: class MainActivity
Main.java:32: error: cannot find symbol
        SharedPreferences mPrefernece= PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
                                       ^
  symbol:   variable PreferenceManager
  location: class MainActivity
Main.java:37: error: package SharedPreferences does not exist
        final SharedPreferences.Editor medit=mPrefernece.edit();
                               ^
Main.java:39: error: cannot find symbol
        jump=(Button)findViewById(R.id.jump);
              ^
  symbol:   class Button
  location: class MainActivity
Main.java:39: error: package R does not exist
        jump=(Button)findViewById(R.id.jump);
                                   ^
Main.java:40: error: package View does not exist
        jump.setOnClickListener(new View.OnClickListener() {
                                        ^
Main.java:51: error: cannot find symbol
        reset=(Button)findViewById(R.id.reset);
               ^
  symbol:   class Button
  location: class MainActivity
Main.java:51: error: package R does not exist
        reset=(Button)findViewById(R.id.reset);
                                    ^
Main.java:52: error: package View does not exist
        reset.setOnClickListener(new View.OnClickListener() {
                                         ^
29 errors

Standard output is empty