variable data type in java 1

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");

            }
        });

    }
}