java programming questions and answers for written test

Leetcode is an American online programming website, which mainly collects the written interview questions of major IT companies, and it is a rare and good helper to find a job for fresh graduates. The advantage of this website is that it will tell you the test data and your output and the correct output is what, conven

Ali 2018-Autumn recruit programming questions 1. Given a dictionary d of a string s and a valid word, determine the minimum number of spaces that can be inserted into s, so that the final string is completely composed of valid words in D and output the solution. If there is no solution, you should output N/a Example: InputS = "Ilikealibaba"D = ["I", "like", "Ali", "Liba", "Baba", "Alibaba"]Example Output:Ou

In the written test, I think many people will encounter factorial programming questions. Today, I suddenly remembered my first written test. I encountered such a question, but I haven't typed it on my computer. I just want to writ

)//the set color is no longer scanned. { intmaxindex=0, minindex=99999; for(Auto J=collect.begin (); J!=collect.end (); j + +){ if((*J) .second>maxindex) Maxindex=(*j). Second; if((*J) .secondminindex) Minindex=(*j). Second; Mintemp=maxindex-minindex+1; } if(mintempminnum) Minnum=mintemp; } } returnMinnum;}intMain () {intarray1[]={0,1,2,6,7,4,1,1,1,1,2,6,7,2,2,0}; Vectorint> v1 (array1,array1+ -); cout6) Endl; ret

BULK INSERT? What data formats are used for both front and back interaction? How does the JSON data format verify the format correctly? Try ... catch ... With return, finally executed before return or after? How garbage processor GC works, when the GC executes Order of execution of SQL keywords Springmvc How to build the environment? Spring Hibernate? What are the notes for spring? SPRINGMVC's annotations,hibernate annotations? Several states of a thread? What is the difference b

Java written test face to finish the first wave-CSDN blog Links: https://blog.csdn.net/shakespeare001/article/details/51151650 directory Java variablesAbout enumerationsAccess control modifierUTF-8 and GBK encoding conversionstrycatchfinally Execution Order problemStatic code block subclass parent class initialization

objects of this class are used in a multithreaded environment, it is best to use StringBuffer. 39. How do I convert a comma-delimited string into an array? Reference: (1) with regular expressions, the code is roughly: ' string[] result = Orgstr.split (","); ' (2) with StringTokenizer, code:StringTokenizer Tokener = StringTokenizer (Orgstr, ",");String[] result = new String[tokener.counttokens ()];int i = 0;while (Tokener.hasnext ()) {result[i++] = Tokener.nexttoken ();}40. 数组有没有length()方法？Strin

instability or even crashes, The GC mechanism provided by Java can automatically monitor whether an object exceeds the scope to achieve the purpose of automatically reclaiming memory, and the Java language does not provide an explicit way to dispose of the allocated memory.20. Write a singleton mode (Singleton)//第一种 ：饿汉模式public class SingleTon{ private SingleTon(){} //实例化放在静态代码块里可提高程序的执行效率，但也可能占用更大的空

simply use an index instead of creating an iterator object. Linklist also creates objects for each inserted element, all of which you have to understand that it also brings additional overhead.Finally, in the book Practical Java, Peter Haggar suggests using a simple array instead of a vector or ArrayList. This is especially true for programs with high efficiency requirements. Because the use of arrays (array) avoids synchronization, additional method

similarities and differences between JSP and servlet?JSP is the extension of servlet technology, is essentially a simple way of servlet, JSP more emphasis on the application of the appearance of expression, compiled is "class servlet." The main difference between Servlets and JSPs is that the application logic of the servlet is in the Java file and is completely detached from the HTML in the presentation layer, whereas the JSP case is that

indicates whether the FETCH statement returns rows from the active set, such as a row is not returned, the value of this property isTrue? (select 1 items)A.%foundB.%notfoundC.%rowcountD.%isopenAnswer: B%found Boolean property, True if the record was last read successfully;%notfound boolean attribute, opposite to%found;%isopen Boolean property that returns TRUE when the cursor is open;%rowcount Numeric property, returns the number of records that have been read from the cursor212. Which clause i

problem that is impossible but difficult. For example, memory overflow. It is impossible to expect the program to handle such a situation.Exception indicates a design or implementation problem. That is to say, it indicates that if the program runs normally, it will never happen.16. What are the similarities and differences between synchronization and Asynchronization? Under what circumstances should they be used separately? Examples.If data is shared among threads. For example, if the data bein