Solving try-catch Adding And Subtracting Calcuator Project Android Studio

try{ //Your Logic's Here } catch (Exception e){ Toast.makeText (MainActivity.this, "Please Enter Number First", Toast.LENGTH_LONG).show(); }


package com.example.rupom.addsub; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends AppCompatActivity { private Button addButton, subButton; private EditText Text1, Text2; private TextView result; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); addButton = (Button) findViewById(R.id.add); subButton = (Button) findViewById(R.id.sub); Text1 = (EditText) findViewById(R.id.editText1); Text2 = (EditText) findViewById(R.id.editText2); result = (TextView) findViewById(R.id.resultShow); addButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { try { String num1String = Text1.getText().toString(); String num2String = Text2.getText().toString(); double num1Double = Double.parseDouble(num1String); double num2Double = Double.parseDouble(num2String); double sum = num1Double + num2Double; result.setText(Double.toString(sum)); } catch (Exception e) { Toast.makeText(MainActivity.this, "Please Enter Number First", Toast.LENGTH_LONG).show(); } } }); subButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { try { String num1String = Text1.getText().toString(); String num2String = Text2.getText().toString(); double num1Double = Double.parseDouble(num1String); double num2Double = Double.parseDouble(num2String); double sum = num1Double - num2Double; result.setText(Double.toString(sum)); } catch (Exception f) { Toast.makeText(MainActivity.this, "Please Enter Number First", Toast.LENGTH_LONG).show(); } } }); } }