java返回java.lang.NumberFormatException異常

問題描述

代碼如下,其中getX()成功有返回結果,getY()卻報異常.

public class AddressUtilDemo { public static void main(String[] args){AddressUtil AddressUtil = new AddressUtil();AddressUtil.setAddress('3454.234,24l.432');System.out.println(AddressUtil.getX());System.out.println(AddressUtil.getY()); }}class AddressUtil { private String address; public AddressUtil(){} public AddressUtil(String address){if(address.indexOf(',')>0){ this.address = address;} } public Double getX(){String string = address.substring(0, address.indexOf(',')) ;return Double.parseDouble(string); } public Double getY(){String string = address.substring((address.indexOf(',')+1));return Double.parseDouble(string); } public String getAddress() {return address; } public void setAddress(String address) {this.address = address.trim(); }}

試過string.trim()等方法都無效.debug看到的string確實是預期中的數值.以下是異常信息:

Exception in thread 'main' java.lang.NumberFormatException: For input string: '24l.432'

問題解答

你應該學會調試,看看getY中的string就知道問題了

24l.43224后們是 L，不是 1

騷年，你main函數里setAddress的是3454.234,24l.432（24L，是L不是1），所以y是錯的，轉化失敗了，建議編輯器字體用Source Code Pro 還能看的出來