java面试题(杨晓峰)---第七讲谈谈int和integer有什么区别?
理解装箱和拆箱的过程.对象由三部分组成:对象头,对象实例,对齐填充.对象头:一般是十六个字节,分两部分,第一部分:哈希码,锁状态标志,线程持有的锁,偏向线程id,gc分代年龄等,第二部分是类型指针,虚拟机由类型指针指向的类型确定对象的类型.对象实例:变量和方法,是父类继承或子类定义.对齐填充:类似占...
[LintCode] Reverse Integer 翻转整数
Reverse digits of an integer. Returns 0 when the reversed integer overflows (signed 32-bit integer).Have you met this question in a real interview?Exa...
LeetCode OJ-- String to Integer (atoi) **
https://oj.leetcode.com/problems/string-to-integer-atoi/细节题，把一个字符串转换成整数class Solution {public: int atoi(const char *str) { if(str == NULL) ...
[LeetCode] String to Integer (atoi) 字符串
Implement atoi to convert a string to an integer.Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below a...
[Leetcode]String to Integer (atoi) 简易实现方法
刚看到题就想用数组做，发现大多数解也是用数组做的，突然看到一个清新脱俗的解法： int atoi(const char *str) { if(*str == '\0') return ; int n; string s(str); is...
[LeetCode]-algorithms-String to Integer (atoi)
Implement atoi to convert a string to an integer.Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below a...
LeetCode: String to Integer (atoi) 解题报告
String to Integer (atoi) Implement atoi to convert a string to an integer.Hint: Carefully consider all possible input cases. If you want a challenge, ...
CharsRefIntHashMap并不比HashMap<String, Integer>快
我模仿lucene的BytesRef写了一个CharsRefIntHashMap,实測效果并不如HashMap<String, Integer>。代码例如以下:package com.dp.arts.lucenex.utils;import org.apache.lucene.util....
交换两个局部变量Integer的值
反射是很强大的，谁说的final修饰的就不能改变，通过反射获取成员变量，之后可以取消访问修饰符，也就是说private的也可以访问，在修改常量（final修饰的），之后就可以对其做任何操作了如下，通过一个方法交换两个Integer对象的值：package ni.jun.yang.test;impor...
Integer.parseInt vs Integer.valueOf
一直搞不清楚这两个有什么区别。刚才特意查了一下帖子。Integer.parseInt 返回的是 primitive intInteger.valueOf 返回的是 Integer ObjectReference:http://stackoverflow.com/questions/7355024/
（面试题）有关Integer
今天在一家公司做了个面试题：运行下列代码，输出结果是什么Integer a=new Integer("12"); Integer b=new Integer("12"); if (a.equals(b)) { System.out.println(true); } else { ...
POJ 1650 Integer Approximation
Integer ApproximationTime Limit: 1000MS Memory Limit: 65536KTotal Submissions: 5081 Accepted: 1652DescriptionThe FORTH programming language does not s...
Leetcode: Reverse Integer 正确的思路下-要考虑代码简化
题目：Reverse digits of an integer.Example1: x = 123, return 321Example2: x = -123, return -321Have you thought about this?Here are some good questions t...
mysql integer size 大小
I was always wondering what the size of numeric columns in MySQL was. Forgive me if this is obvious to someone else. But for me the MySQL manual lacks...
java中Integer,String判断相等与integer的比较大小
package sfk.bbs.test.springjsbctempletTest;import static org.junit.Assert.*;import org.junit.Test;public class testBase{ @Test public void test(...
LeetCode题解(13)--Roman to Integer
https://leetcode.com/problems/roman-to-integer/原题：Given a roman numeral, convert it to an integer.Input is guaranteed to be within the range from 1 to...
【一天一道LeetCode】#13. Roman to Integer
一天一道LeetCode系列（一）题目Given a roman numeral, convert it to an integer.Input is guaranteed to be within the range from 1 to 3999.（二）解题和上一题相反，这题将罗马数字转换成整形数...
【LeetCode】13. Roman to Integer 罗马数字转整数
题目：Given a roman numeral, convert it to an integer.Input is guaranteed to be within the range from 1 to 3999.思路：与12题正好相反，罗马数字基本字符集：I V X L C D M (1, 5...
《LeetBook》leetcode题解(13):Roman to Integer[E]
我现在在做一个叫《leetbook》的免费开源书项目，力求提供最易懂的中文思路，目前把解题思路都同步更新到gitbook上了，需要的同学可以去看看 书的地址：https://hk029.gitbooks.io/leetbook/013. Roman to Integer问题Given a rom...
C# 写 LeetCode easy #13 Roman to Integer
13、Roman to IntegerRoman numerals are represented by seven different symbols: I, V, X, L, C, D and M.Symbol ValueI 1V 5X...