public class OverloadingTest extends Format{ public int add(String s1){ System.out.println("With String"); return 1; } public int add(Object a){ System.out.println("With Object"); return 1; } public static void main(String[] args) { OverloadingTest overloadingTest = new OverloadingTest(); overloadingTest.add(null); } } Wh
public class OverloadingTest extends Format{ public int add(String s1){ System.out.println("With String"); return 1; } public int add(Object a){ System.out.println("With Object"); return 1; } public static void main(String[] args) { OverloadingTest overloadingTest = new OverloadingTest(); overloadingTest.add(null); } }
I've discovered the Java File locking mechanism is a real mistake since it cannot do the 1st rule of locking - blocking on a call to lock! Unless I'm wrong - a call to lock() will throw an Exception if an application already maintains a lock on the file, which I know will be the case in my application. I've looked through some answers here and unfortunately I am not using Java 7.
我发现Java文件锁定机制是一个真正的错误,因为它不能执行锁定的第一条规则 - 阻止锁定的呼叫! 除非我错了 - 如果应用程序已经对文件保持锁定,那么对lock()的调用将会抛出异常,我知道在我的应用程序中会出现这种情况。 我在这里查看了一些答案,不幸的是我没有使用Java 7。 有没有人有建议,我可能会处理等待独占文件锁,而不让自己在一段while(true)循环:) 奥宾的答案后编辑(复制来自评论): 我想要做的是在复制
I want to have a Class object, but I want to force whatever class it represents to extend class A and implement interface B. I can do: Class<? extends ClassA> Or: Class<? extends InterfaceB> but I can't do both. Is there a way to do this? Actually, you can do what you want. If you want to provide multiple interfaces or a class plus interfaces, you have to have your wildc
我想要一个Class对象,但我想强制它所代表的任何类来扩展类A并实现接口B. 我可以: Class<? extends ClassA> 要么: Class<? extends InterfaceB> 但我不能这样做。 有没有办法做到这一点? 其实,你可以做你想做的。 如果你想提供多个接口或一个类加接口,你必须让你的通配符看起来像这样: <T extends ClassA & InterfaceB> 请参阅sun.com上的Generics Tutorial,特别是页面底部的Bounded T
Background: I am looking at radix sort, and I believe I have a pretty good idea of how the algorithm works in general. However, I am having trouble understanding how you actually "interpret" each of the elements as you go through the list. I'll explain a bit more: Lets say I have arrayToSort = [50, 4, 2, 10, 22, 284] From my understanding, I'd go from 0 to 9 sorting by
背景: 我正在研究基数排序,我相信我对算法的工作原理有一个很好的想法。 但是,我无法理解您在浏览列表时如何实际“解读”每个元素。 我会再解释一下: 可以说我有arrayToSort = [50, 4, 2, 10, 22, 284] 根据我的理解,我会从0到9排序十位。 所以,我会: 斗0:50,10 第1桶:空 时段2:2,22 第3桶:空 桶4:4,284(和5 - 9是空的) 然后,我将通过将每个存储桶中的元素(从存储桶0开始)放入新阵列中
The problem is, given an input file with four billion unique integers, provide an algorithm to generate an integer which is not contained in the file, assume only have 10 MB of memory. Searched for some solutions and posted code below, one of which is to store integers into bit-vector blocks (each block representing a specific range of integers among 4 billion range, each bit in the block repre
问题在于,如果输入文件具有40亿个唯一整数,则会提供一种生成文件中未包含的整数的算法,假定只有10 MB的内存。 搜索下面的一些解决方案和发布的代码,其中之一是将整数存储到位向量块(每个块代表40亿范围内的整数的特定范围,块中的每个位表示一个整数),并使用另一个计数器为每个块计算每个块中的整数数量。 因此,如果整数的数量小于整数的块容量,则扫描该块的位向量以查找哪些缺失整数。 我对这个解决方案的问题是
I would like to run a program that can determine the validation and type of credit card number based of number entered. Compiler shows notification that there is an error in my coding but I cannot detect where is it. The program is also cannot be run. Below is the coding, import java.util.*; public class CreditCard { public static void main(String args[]) { S
我想运行一个程序,可以根据输入的号码确定信用卡号码的确认和类型。 编译器显示通知我的代码有错误,但我无法检测到它在哪里。 该程序也无法运行。 下面是编码, import java.util.*; public class CreditCard { public static void main(String args[]) { String CType;(String number) { if (number.startsWith("4")) return "Visa";
I need to do a Credit card number validation. When I googled this I found the org.apache.commons.validator.CreditCardValidator . But seems like it is not working correctly. When I pass a non-digit character also it porvides true. Code for Apache CreditCardValidator: String ccNumber = "378282246310005"; CreditCardValidator creditCardValidator = new CreditCardValidator(); if(!creditCardValid
我需要做一个信用卡号码验证。 当我谷歌搜索时,我发现了org.apache.commons.validator.CreditCardValidator 。 但似乎它不能正常工作。 当我传递一个非数字字符时,它也是真实的。 Apache CreditCardValidator的代码: String ccNumber = "378282246310005"; CreditCardValidator creditCardValidator = new CreditCardValidator(); if(!creditCardValidator.isValid(ccNumber)) throw new Exception("Credit Card Number
This question already has an answer here: How do you detect Credit card type based on number? 26 answers According to one of the answers in the thread, The cards can be validated based on following data. Visa: ^4[0-9]{6,}$ Visa card numbers start with a 4. MasterCard: ^5[1-5][0-9]{5,}$ MasterCard numbers start with the numbers 51 through 55, but this will only detect MasterCard credit ca
这个问题在这里已经有了答案: 如何根据数字检测信用卡类型? 26个答案 根据线索中的答案之一,可以根据以下数据验证卡片。 签证: ^4[0-9]{6,}$ Visa卡号码以4开头。 万事达卡: ^5[1-5][0-9]{5,}$万事达卡号码以51到55开头,但这只会检测到万事达信用卡; 使用MasterCard系统发行的其他卡不属于此IIN范围。 美国运通: ^3[47][0-9]{5,}$美国运通卡号码以34或37开头。 大来卡: ^3(?:0[0-5]|[68][0-9])[0-9]{4,}$
I need an algorithm to find matching pairs of objects in a list. This is an example case: class Human { int ID; string monthOfBirth; string country; string [] hobbies = {}; } There is a large list of humans and the problem is to find matching human pairs, and this needs to be done efficiently because the lists are huge. Matching criteria: Birth month and country must match exa
我需要一个算法来查找列表中匹配的对象对。 这是一个例子: class Human { int ID; string monthOfBirth; string country; string [] hobbies = {}; } 有一大堆人类,问题是找到匹配的人类对,而这需要高效地完成,因为这些清单非常庞大。 匹配标准: 出生月份和国家必须完全匹配 两者应该有超过x%的爱好匹配。 由于(2)标准,我们不能做一个精确的等值比较。 我能想到的方式是: 蛮力 - 比较每个
Here I am trying to disconnect two vertices in a graph with minimum edge removal possible. In this graph between two vertices A and Z you can find the answer in many ways. In optimal way you can remove just one edge from A to B . If there is any specific algorithm for this? I found some suggestions to solve this by using maximum flow min cut problem but I am not getting general idea to con
在这里,我试图断开图中最小边移除的两个顶点。 在这两个顶点A和Z之间的图中,您可以通过多种方式找到答案。 以最佳方式,您可以只从A到B移除一个边缘。 如果有什么具体的算法呢? 我发现了一些建议,通过使用最大流最小切割问题来解决这个问题,但是我没有得到将这个问题转换成最大流最小割定理的一般想法。 同样在这个过程中,我最终可能会删除F和G之间无用的边。 这可以使用Max Flow - Min Cut问题来解决。 您