JAVA complate Project

public class MainActivity extends AppCompatActivity { TextView textview ; Button button ; EditText edittext ; @Override protected void onCreate ( Bundle savedInstanceState ) { super .onCreate( savedInstanceState ) ; setContentView( R . layout . activity_main ) ; textview = findViewById( R . id . textview ) ; button = findViewById( R . id . button ) ; edittext = findViewById( R . id . edittext ) ; button .setOnClickListener( new View . OnClickListener () { @Override public void onClick ( View v ) { int x = 3 ; int y = 2 ; x += y ; // x = x+y textview .append( " x = " + x + " \n " ) ; x -= y ; // x = x-y textview .append( " x = " + x + " \n " ) ; x *= y ; // x = x*y textview .append( " x = " + x + " \n " ) ; ...

public class MainActivity extends AppCompatActivity { TextView textview ; Button button ; EditText edittext ; @Override protected void onCreate ( Bundle savedInstanceState ) { super .onCreate( savedInstanceState ) ; setContentView( R . layout . activity_main ) ; textview = findViewById( R . id . textview ) ; button = findViewById( R . id . button ) ; edittext = findViewById( R . id . edittext ) ; button .setOnClickListener( new View . OnClickListener () { @Override public void onClick ( View v ) { int num1 , num2 , result ; num1 = 20 ; num2 = 10 ; // Arithmetic operator | Type casting result = num1 + num2 ; textview .append( "reasult = " + result + " \n " ) ; result = num1 - num2 ; textview .append( "reasult = " + result + " \n " ) ; ...

public class MainActivity extends AppCompatActivity { TextView textview ; Button button ; EditText edittext ; @Override protected void onCreate ( Bundle savedInstanceState ) { super .onCreate( savedInstanceState ) ; setContentView( R . layout . activity_main ) ; textview = findViewById( R . id . textview ) ; button = findViewById( R . id . button ) ; edittext = findViewById( R . id . edittext ) ; button .setOnClickListener( new View . OnClickListener () { @Override public void onClick ( View v ) { String sTextFromET = edittext .getText().toString() ; int nIntFromET = new Integer( sTextFromET ).intValue() ; textview .setText( "Number = " + nIntFromET ) ; } }) ; } }

public class MainActivity extends AppCompatActivity { TextView textview ; Button button ; @Override protected void onCreate ( Bundle savedInstanceState ) { super .onCreate( savedInstanceState ) ; setContentView( R . layout . activity_main ) ; textview = findViewById( R . id . textview ) ; button = findViewById( R . id . button ) ; button .setOnClickListener( new View . OnClickListener () { @Override public void onClick ( View v ) { boolean b = true ; char c = 'a' ; short s = 32677 ; int i = 3272 ; float f = 10.2f ; double d = 10.2 ; textview .append( "b = " + b + " \n " + c + " \n " + s + " \n " + i + " \n " + f + d + " \n " ) ; } }) ; } }