java - How to convert string to double

MainActivity.java

 package com.cfsuman.me.javaexamples;  import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.TextView;  import java.text.DecimalFormat; import java.text.DecimalFormatSymbols; import java.text.ParseException;   public class MainActivity extends AppCompatActivity {      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get widget reference from XML layout         TextView tv = (TextView) findViewById(R.id.tv);          // Initialize a new string with double data type value         String stringOfDoubleValue = "29.99";         tv.setText("String : " + stringOfDoubleValue);          // Parse string to double         double doubleFromString = Double.parseDouble(stringOfDoubleValue);         tv.setText(tv.getText()+ "\nDouble.parseDouble(): " + stringOfDoubleValue);          // Another way to convert a string to double         double value = Double.valueOf(stringOfDoubleValue);         tv.setText(tv.getText()+ "\n\nString : " + stringOfDoubleValue);         tv.setText(tv.getText()+ "\nDouble.valueOf() : " + value);          // Another way to convert a string to double         double doubleValue = new Double(stringOfDoubleValue).doubleValue();         tv.setText(tv.getText()+ "\n\nString : " + stringOfDoubleValue);         tv.setText(tv.getText()+ "\nnew Double().doubleValue() : " + doubleValue);          // Initialize a new string of double value with comma decimal separator         String stringAsDouble = "125,33";         tv.setText(tv.getText()+ "\n\nString : " + stringAsDouble);          // Another way to convert a string to double using decimal formatter         DecimalFormat formatter = new DecimalFormat();         DecimalFormatSymbols symbol = new DecimalFormatSymbols();         // Specify the decimal separator symbol         symbol.setDecimalSeparator(',');         formatter.setDecimalFormatSymbols(symbol);          // Try to parse the double value         try{             double doubleVal = formatter.parse(stringAsDouble).doubleValue();             tv.setText(tv.getText()+ "\nDecimalFormat.parse().doubleValue() : " + doubleVal);         }catch (ParseException e)         {             e.printStackTrace();         }    } } 

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