package com.example.java1;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

TextView theTxt;

Button btn_Button;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

theTxt = (TextView) findViewById(R.id.textView2);

btn_Button = (Button) findViewById(R.id.button1);

//Change the button text

Button button_btn = (Button)findViewById(R.id.button1);

button_btn.setText("Click me");

//set the text to uppercase & or .toLowerCase (if there is)

btn_Button.setOnClickListener(new View.OnClickListener(){

@Override

public void onClick(View v)

{

theTxt.setText("tanttax".toUpperCase());

}

});

}

}