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原创 java互联网大厂高频面试412题

两个对象的 hashCode() 相同，则 equals() 也一定为 true，对吗？不对，两个对象的 hashCode() 相同，equals() 不一定 true。代码示例：String str1 = "精彩";String str2 = "笔记";System. out. println(String. format("str1：%d | str2：%d", str1. hashCode(),str2. hashCode()));System. out. println(st..

2020-06-08 18:38:18 225

原创刷题技巧简介

机试

2022-06-15 20:56:36 1464 1

原创数据流图转换为软件结构图

假设一家工厂的采购部每天需要一张订货报表，报表按零件编号排序，表中列出所有需要再次订货的零件。对于每个需要再次订货的零件应该列出下述数据：零件编号，零件名称，订货数量，目前价格，主要供应者，次要供应者。零件入库或出库称为事务，通过放在仓库中的CRT终端把事务报告给订货系统。当某种零件的库存数量少于库存量临界值时就应该再次订货。将该图转换为软件结构图...

2022-05-06 17:28:07 8260 2

原创 LR编译原理

https://blog.csdn.net/weixin_44801799/article/details/113343539?utm_medium=distribute.pc_relevant_download.none-task-blog-baidujs-3.nonecase&depth_1-utm_source=distribute.pc_relevant_download.none-task-blog-baidujs-3.nonecase

2021-04-27 20:14:30 143

原创 java Comparator 实例应用

package cn.hfut.www.SortRefType;import java.util.Comparator;public class GoodsPriceComp implements Comparator<Goods>{ @Override public int compare(Goods o1, Goods o2) { ...

2019-01-08 21:59:01 253

原创 JAVA Comparable实例使用

package cn.hfut.www.SortRefType;import java.text.SimpleDateFormat;import java.util.Date;import java.util.SimpleTimeZone;/** 新闻条目实体类*/public class NewsItem implements Comparable<NewsItem>...

2019-01-08 21:30:04 164

原创 java Collections使用

public class Demo05{ public static void main(String[] args) { List<String> list=new ArrayList(); list.add("a"); list.add("abcd"); list.add("abc"); ...

2019-01-08 20:58:39 487

原创 JAVA Comparator 和Comparable的使用

import java.util.Comparator;import java.util.List;public class Utils{ /* * List 排序+比较器 * */ public static <T> void sort(List<T> list,Comparator<T> com){ ...

2019-01-08 20:31:52 115

原创 java实现容器、泛型等排序

public class Utils{ public static <T extends Comparable<T>> void sort(List<T> list) { //容器排序 Object[] arr=list.toArray(); sort(arr); for(int i=...

2019-01-08 20:00:53 209

原创 Java日期及日历

//日期时间格式化 public static void main(String[] args) { Date date=new Date(System.currentTimeMillis()); DateFormat df=new SimpleDateFormat("yyyy-MM-dd,hh-mm-ss-SS"); String st...

2019-01-03 19:42:55 148

原创 C++ 模板之string

#include<stdio.h>#include<stdlib.h>#include<string.h>#include<string>using namespace std;void test(const string& t) {}void test(string& t) {}int main(){ s...

2018-12-13 22:27:04 412

原创 C++模板库list

#include<stdio.h>#include<list>using namespace std;int main(){ list<int> mylist(4); mylist.clear(); mylist.push_back(1); mylist.push_back(2); mylist.push_back(3); mylist.p...

2018-12-13 21:21:55 386

原创 C++vector的使用

#include<stdio.h>#include<stdlib.h>#include<vector>using namespace std;int main(){ vector<int> arr(2); arr.clear(); arr.push_back(12); arr.push_back(13);// int capa...

2018-12-13 20:24:27 129

原创 C++实现模板实现动态申请内存

#include<stdio.h>#include<stdlib.h>#include<string.h>template <typename T>class Array{private: T* m_buffer; int m_capacity; int m_size;public: Array(int capacity=4)...

2018-12-13 17:16:43 744

原创 C++模板实现

#include<stdio.h>#include<stdlib.h>template <typename T>T find_max(T data[],int len){ T max = data[0]; for (int i = 0; i < len; i++) { if (data[i] > max) max = dat...

2018-12-13 16:17:01 258

原创 C++重载输出操作符

#include<stdio.h>#include<stdlib.h>class Point{public: int x; int y;public: Point() { } Point(int a, int b) { x = a; y = b; }};class Logger{public: Logger() { } Lo...

2018-12-13 11:27:28 725

原创 C++重载类型转换操作符（）

#include<stdio.h>#include<stdlib.h>class Fraction{public: int num; int den; Fraction():num(1),den(1) { } Fraction(int n, int d) :num(n), den(d) { } operator double() { ret...

2018-12-13 11:06:47 355

原创 C++重载关系运算符==,

#include<stdio.h>#include<stdlib.h>class Fraction{public: int num; int den; Fraction():num(1),den(1) { } Fraction(int n,int d):num(n),den(d) { } bool operator ==(const Fracti...

2018-12-13 10:47:38 1494

原创 C++重载【】

#include<stdio.h>#include<string.h>class Text{public: int m_size; char* m_buf; Text(const char* str) { m_size = strlen(str) + 1; m_buf = new char[m_size]; strcpy(m_buf, str...

2018-12-12 22:49:40 1433

原创 C++实现重载操作运算符

#include<stdio.h>#include<stdlib.h>class Fraction{public: int num; //分子 int den; //分母 Fraction() : num(1), den(1) { } Fraction(int n, int d) : num(n), den(d) { } //重载加号操作符 ...

2018-12-12 22:08:27 173

原创 C++实现朋友类

#include<stdio.h>#include<stdlib.h>#include<string.h>class Object{ friend void Print(Object* p); friend class Something;public: Object(int v):value(v) { }private: int v...

2018-12-12 21:42:40 288

原创 C++实现拷贝构造函数

#include<stdio.h>class Object {public: int a; int b;public: Object(int a,int b) { this->a = a; this->b = b; } Object(const Object& other) { this->a = other.a; th...

2018-12-12 21:16:53 162

原创 C++实现字段分割

#include<stdlib.h>#include<string.h>#include<stdio.h>void show(char* text);int split(char* string, char* arg[]);void show(char* text) { char* argv[128]; int tem_count = spli...

2018-12-12 20:10:05 191

原创 C++纯虚函数实现命令行解析

CmdInput.cpp#include <stdio.h>#include <string.h>#include "CmdInput.h"CmdInput::CmdInput(){ m_handler = NULL;}void CmdInput::SetHandler(CmdHandler* h){ m_handler = h;}int...

2018-12-12 16:36:11 140

原创 C++结构体实现面向对象

#include <stdio.h>#include <string.h>#include <stdlib.h>#include "DataStore.h"DataStore* ds_create(){ // 动态创建对象 DataStore* store = (DataStore*)malloc(sizeof(DataStore));...

2018-12-11 16:42:35 392

原创 C++类实现面向对象

#include "DataStore.h"#include<stdlib.h>#include<stdio.h>DataStore::DataStore() { m_head.next = NULL;}DataStore::~DataStore() { Student* p = m_head.next; while (p) { Student* ...

2018-12-11 16:40:11 185

原创 C++结构体在文件中的存取

#include<stdio.h>#include<stdlib.h>#include<string.h>char* file_name = "G:\\aaaa.xyz";struct Car { char maker[32]; int price;};struct owner { char name[32]; int age; Car*...

2018-12-03 17:33:46 2306

原创 C++文件读取

#include<stdio.h>#include<stdlib.h>int main() { char* filename = "G:\\test.txt"; FILE* fp = fopen(filename, "rb"); if (fp == NULL) { printf("no such file"); return -1; } //读数据...

2018-12-03 10:57:45 130

原创 c++写文件

#include<stdio.h>#include<stdlib.h>int main() { const char* filename = "G:/test.txt"; FILE *fp = fopen(filename,"wb"); if (fp == NULL) { printf(" no such file"); } char buf[] = "...

2018-12-03 10:25:12 525

原创 C++读写文件

#include<stdio.h>int main() { const char* filename = "G:/test.txt"; FILE *fp = fopen(filename,"wb"); if (fp == NULL) { printf(" no such file"); } else { pri...

2018-12-02 22:58:07 74

原创 C++ 《time.h》的使用

#include<time.h>#include<stdio.h>#include<stdlib.h>time_t convert(tm* tp,int year, int month, int day, int hour, int minute, int second) { tm info; info.tm_year = year - 1900...

2018-12-02 22:18:37 1238

原创华为大数26进制

input1='z'input2='bc'sb=[chr(i) for i in range(97, 123)]list1=[x for x in input1]list2=[x for x in input2]add=[]num1=[sb.index(x) for x in list1]num2=[sb.index(x) for x in list2]if len(num1) ...

2018-09-05 23:25:48 205

原创华为机试

sabc = ''snum=''dict={}string = 'awbc2awer2tyui2'j=0i=0length=len(string)while(i<length): sabc = '' snum = '' while(i<length and string[i].isalpha()): sabc = sabc + ...

2018-09-05 22:15:53 517

原创信息增益

import numpy as npimport sysdef calc_ent(x): x_value_list = set([x[i] for i in range(x.shape[0])]) ent = 0.0 for x_value in x_value_list: p = float(x[x == x_value].shape[0]) / x...

2018-09-05 18:22:30 192

原创 Python随机漫步

#时间漫步import numpy as npfrom numpy import linalgimport randomposition=0walk=[position]steps=1000for i in range(steps): step=1 if random.randint(0,1) else -1 position+=step walk.appe...

2018-08-31 17:05:35 1089

原创 Python基础知识

#将条件逻辑表达为数据运算import numpy as npimport sysxarr=np.array([1.1,1.2,1.3,1.4,1.5])yarr=np.array([2.1,2.2,2.3,2.4,2.5])cond=np.array([True,False,True,True,False])result=[(x if c else y) for x,y,c in ...

2018-08-31 09:52:19 95

原创二维插值的三维显示

# -*- coding: utf-8 -*-"""演示二维插值。"""# -*- coding: utf-8 -*-import numpy as npfrom mpl_toolkits.mplot3d import Axes3Dimport matplotlib as mplfrom scipy import interpolateimport matplotlib.cm a

2017-10-12 17:04:52 1245

原创二维插值

# -*- coding: utf-8 -*-"""演示二维插值。"""import numpy as npfrom scipy import interpolateimport pylab as plimport matplotlib as mpldef func(x, y): return (x + y) * np.exp(-5.0 * (x ** 2 + y **

2017-10-12 10:53:50 1998

原创 python 一阶插值

#!/usr/bin/env python# -*-coding:utf-8 -*-import numpy as npfrom scipy import interpolateimport pylab as plx = np.linspace(0, 10, 11)# x=[ 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.]

2017-10-11 17:10:10 5103 1

原创某东机试第二题

题目描述合法的括号匹配序列被定义为1 空串“”是合法的括号序列2如果“X”和“Y”是合法的序列，那么“XY”也是一个合法的括号序列3如果“X”是一个合法的序列，那么“（X)”也是一个合法的括号序列4每个合法的括号序列都可以由上面的规则生成例如“”，“（）”，“（）（）（）”，“（（）（））”，“（（（（））））”都是合法的。东东现在有一个合法的括号序列s，一次移除操作分为两

2017-09-09 10:24:25 1657 2