numberformatexception

问题 I can't understand the reason of NumberFormatException in this code: SimpleDateFormat format = (SimpleDateFormat) SimpleDateFormat.getDateInstance(); Below is my LogCat output: 10-30 18:04:05.600: W/System.err(23899): java.lang.NumberFormatException: Invalid int: "" 10-30 18:04:05.600: W/System.err(23899): at java.lang.Integer.invalidInt(Integer.java:138) 10-30 18:04:05.600: W/System.err(23899): at java.lang.Integer.parseInt(Integer.java:359) 10-30 18:04:05.600: W/System.err(23899): at java

问题 I can't understand the reason of NumberFormatException in this code: SimpleDateFormat format = (SimpleDateFormat) SimpleDateFormat.getDateInstance(); Below is my LogCat output: 10-30 18:04:05.600: W/System.err(23899): java.lang.NumberFormatException: Invalid int: "" 10-30 18:04:05.600: W/System.err(23899): at java.lang.Integer.invalidInt(Integer.java:138) 10-30 18:04:05.600: W/System.err(23899): at java.lang.Integer.parseInt(Integer.java:359) 10-30 18:04:05.600: W/System.err(23899): at java

问题 I keep getting number format expectations, even though I'm trimming the strings and they don't contain non numerical characters bizarrely it works for some numbers and not others. Below is an example of a string I get number format exception for. Also, any string starting with 0 e.g "0208405223", is returned 208405223, there's no zero anymore is that supposed to happen? String n="3020857508"; Integer a = Integer.parseInt(n.trim()); System.out.println(a); This is the exception: Exception in

问题 I was writing a program to convert a String fed IP-Address to IP-Address by utilising the method InetAddress.getByAddress(byte[] addr) . So, what I did was input IP-from the user in the form of String. Parsed it and splitted the IP on . using String.split("\\.") . Then, I started converting that String array into byte array where I am right now stuck on. Please help me to get rid of this situation. Any workaround OR alternate way of accessing this will be heartly appreciated... The code goes

问题 I'm trying to get it to if a user doesn't enter a value in the EditText boxes, the initial value is set to 0 (to prevent the crash error NumberFormatException Invalid int: "") which is thrown assuming because there is no integer value to read, since the user didn't input one in this case. I've tried a number of things most recently this: String boozeAmount = boozeConsumed.getText().toString(); if (boozeAmount == "" || boozeAmount == null){ boozeConsumed.setText("0"); boozeAmount =

问题 I'm creating an Android app, and I'm reading some coordinates from a text file. I'm using Integer.parseInt(xCoordinateStringFromFile) to convert the X coordinates to integers, and in the same way with the Y coordinates. When I run the app, I get an error on that line, which looks like this: BridgeData data = new BridgeData( elements[0], elements[1], Integer.parseInt(elements[2]), Integer.parseInt(elements[3]), Integer.parseInt(elements[4]), new GeoPos(Integer.parseInt(elements[5].split(",")[0

问题 I have a method that takes n and returns nth Fibonacci number. Inside the method implementation I use BigDecimal to get the nth Fibonacci number then I use method toBigInteger() to get the number as a BigInteger object and that's surely because I am working with huge numbers in my application. I keep getting correct results until I pass 1475 as an argument for my method. I get NumberFormatException: Infinite or NaN in this case without any clear reason for me. Could you please explain me why

问题 I'm trying to create a program which takes input from a CSV-file and writes it to a Java-created Access database and table. The program uses a while-loop to go through the CSV-file. The first line of the file is written perfectly to the database, but it crashes at the second line, while trying to write the same kind of input to the table. How can I solve this? Here's my code so far: public void GPXtoAccess() { try { Access = new Scanner(DummyCSV); Scanner = new Scanner(DummyCSV); while

问题 I have a checkbox in my JSP page that accepts integer values: <form:checkbox path="somePath" value="2" /> Dangerous Checkbox <br /> If the user changes the value of the input to a String value, e.g.: <form:checkbox path="somePath" value="blah" /> Dangerous Checkbox <br /> the page will throw a NumberFormatException . How can I catch this in my Controller and show a meaningful message? 回答1: you can use JSTL's c:catch tag: <c:catch var ="numberFormatException"> <form:checkbox path="somePath"

问题 I am trying to load info from a properties file and i have the following code: anInt = Integer.parseInt(prop.getProperty("anInt")); aDouble = Double.parseDouble(prop.getProperty("aDouble")); and while the first line works just fine, the second one where i am trying to load a double variable throws a NumberFormatException . The specific exception message is: Exception in thread "main" java.lang.NumberFormatException: For input string: "78,5" at sun.misc.FloatingDecimal.readJavaFormatString