ANDROID STUDIO APP-DEV | SIMPLE COMPUTATION OF TWO NUMBERS

public class MainActivity extends AppCompatActivity {
    EditText num1,num2;
    TextView result;
    Button add,sub,mul,div;

    @Override    protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);


            num1 = findViewById(R.id.number1);
            num2 = findViewById(R.id.number2);
            result = findViewById(R.id.myresult);
            add = findViewById(R.id.addBtn);
            sub = findViewById(R.id.subBtn);
            mul = findViewById(R.id.mulBtn);
            div = findViewById(R.id.divBtn);


            add.setOnClickListener(new View.OnClickListener() {
                @Override                public void onClick(View v) {
                    int a = Integer.parseInt(num1.getText().toString());
                    int b = Integer.parseInt(num2.getText().toString());
                    int sum = a + b;
                    result.setText(String.valueOf(sum));
                }



            });
            
            sub.setOnClickListener(new View.OnClickListener() {
                @Override                public void onClick(View v) {

                    int a = Integer.parseInt(num1.getText().toString());
                    int b = Integer.parseInt(num2.getText().toString());
                    
                        int sub = a - b;
                        result.setText(String.valueOf(sub));
                }
            });

        div.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View v) {

                int a = Integer.parseInt(num1.getText().toString());
                int b = Integer.parseInt(num2.getText().toString());

                int quo = a / b;
                result.setText(String.valueOf(quo));

            }
        });

        mul.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View v) {

                int a = Integer.parseInt(num1.getText().toString());
                int b = Integer.parseInt(num2.getText().toString());

                int pro = a * b;
                result.setText(String.valueOf(pro));

            }
        });
    }
}