/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

Similar codes

0 vote409 views1 answer
Spring-boot java header appliacation/json constant
Java Spring
8 votes351 views4 answers
How to import cert from browser into java
Java
-1 vote373 views1 answer
Mysql connection details in springboot
Java Spring
30 votes342 views6 answers
Reverse string in java
Java
0 vote340 views1 answer
Java string get ith char
Java
0 vote335 views1 answer
Para que sirve getcontentpane en java
Java
1 vote305 views2 answers
Java get number out of string
Java
4 votes306 views1 answer
Properties java 8 maven in pom xml
Java
5 votes342 views1 answer
Declare function in java
Java
1 vote351 views1 answer
Java integer to binary string with leading zeros
Java