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Write a Java Program to Check if a String is Numeric
PROGRAM: Java Program to Check if a String is Numeric
/*Java Program to Check if a String is Numeric*/
1: Check if a string is numeric
public class Numeric {
public static void main(String[] args) {
String string = “12345.15”;
boolean numeric = true;
try {
Double num = Double.parseDouble(string);
} catch (NumberFormatException e) {
numeric = false;
}
if(numeric)
System.out.println(string + ” is a number”);
else
System.out.println(string + ” is not a number”);
}
}
2: Check if a string is numeric or not using regular expressions (regex)
public class Numeric {
public static void main(String[] args) {
String string = “-1234.15”;
boolean numeric = true;
numeric = string.matches(“-?\\d+(\\.\\d+)?”);
if(numeric)
System.out.println(string + ” is a number”);
else
System.out.println(string + ” is not a number”);
}
}
