/Java/Check whether a double is not a number in java

Check whether a double is not a number in java

double delta = -3;
double val = Math.sqrt(delta);
System.out.println(Double.isNaN(val)); // true

How to check if string is double or not in java

String decimalPattern = "([0-9]*)\\.([0-9]*)";  
String number="20.00";  
boolean match = Pattern.matches(decimalPattern, number);
System.out.println(match); //if true then decimal else not

Source: stackoverflow.com

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