Java string to int error

To convert a string to an int value in Java, you can use the Integer.parseInt method. This method takes a string as an argument and returns the int value represented by that string.

Here's an example of how to use the Integer.parseInt method:

String s = "123";
int i = Integer.parseInt(s);  // i is 123

Note that the Integer.parseInt method only works for strings that represent a valid int value. If the input string is empty or contains non-numeric characters, the Integer.parseInt method will throw a NumberFormatException.

Here's an example of how you can handle the NumberFormatException:

String s = "123";
try {
    int i = Integer.parseInt(s);
} catch (NumberFormatException e) {
    e.printStackTrace();
}

It's a good idea to handle this exception in a try-catch block, as shown in the example above, to avoid your program crashing if the input string is not a valid representation of an int value.

You can find more information about the Integer.parseInt method and examples of how to use it in the Java documentation.