1. showName coding

1. object define

2. interface with xml.

3. set

package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private Button mybutton;            // object define  V
    private TextView showText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        mybutton = findViewById(R.id.button);           // interface with xml       V
        showText = findViewById(R.id.textView2);        // id : xml의 각 id 동일    V

        showText.setText("하하하하하");		//   V

    }
}