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Java Program to check if a string is a valid number
To check if a string is a valid Integer, use the Integer.parseInt() method, with the string to be checked passed as a parameter.
To check if a string is a valid Float, use the Float.parseFloat() method, with the string to be checked passed as a parameter.
The following is an example that checks for valid integer.
Example
public class Demo {
public static void main(String args[]) throws Exception {
String id = "100";
int val = Integer.parseInt(id);
System.out.println(val);
}
}Output
100
The following is an example that checks for valid float.
Example
public class Demo {
public static void main(String args[]) throws Exception {
String id = "100.5";
float val = Float.parseFloat(id);
System.out.println(val);
}
}Output
100.5
Updated on: 26-Jun-2020
2K+ Views
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