check if string has no numbers java code example
Example 1: java check if string is number
try {
int n = Integer.parseInt(str);
} catch (NumberFormatException e) {
}
Example 2: how to check if a string has only numbers in java
class GFG {
public static boolean
onlyDigits(String str, int n)
{
for (int i = 0; i < n; i++) {
if (str.charAt(i) >= '0'
&& str.charAt(i) <= '9') {
return true;
}
else {
return false;
}
}
return false;
}
public static void main(String args[])
{
String str = "1234";
int len = str.length();
System.out.println(onlyDigits(str, len));
}
}