if (collectionutils.isnotempty(faqexcelvos)) { faqexcelvos.foreach(faqexcelvo -> { if (faqexcelvo.getanswer().length() > excel2007.getmaxtextlength()) { string answer = faqexcelvo.getanswer(); faqexcelvo.setanswer(answer.substring(0, excel2007.getmaxtextlength())); faqexcelvo.setoverlimitanswer(answer.substring(excel2007.getmaxtextlength())); } }); }通过optional优化


在Java 8中,我们可以使用Optional类来优化这段代码,使其更简洁。首先,我们需要导入Optional类: ```java import java.util.Optional; ``` 然后,我们可以修改foreach循环如下: ```java Optional.ofNullable(faqexcelvos) .ifPresent(faqexcelvosList -> { faqexcelvosList.forEach(faqexcelvo -> { Optional<String> answerOpt = Optional.ofNullable(faqexcelvo.getAnswer()); answerOpt.ifPresent(answer -> { if (answer.length() > excel2007.getMaxTextLength()) { String shortenedAnswer = answer.substring(0, excel2007.getMaxTextLength()); String overLimitAnswer = answer.substring(excel2007.getMaxTextLength()); faqexcelvo.setAnswer(shortenedAnswer); faqexcelvo.setOverLimitAnswer(overLimitAnswer); } }); }); }); ``` 这样,我们使用Optional.ofNullable检查faqexcelvos是否为null,如果非空则执行后续操作。对于answer字段,我们也使用Optional.ofNullable检查其是否为空,避免了null pointer异常。如果answer长度超过限制,我们就将其截断并设置新的值。 [2024-05-20 11:25:30 | AI写代码神器 | 251点数解答]
- if (collectionutils.isnotempty(faqexcelvos)) { faqexcelvos.foreach(faqexcelvo -> { if (faqexcelvo.getanswer().length() > excel2007.getmaxtextlength()) { string answer = faqexcelvo.getanswer(); faqexcelvo.setanswer(answer.substring(0, excel2007.getmaxtextlength())); faqexcelvo.setoverlimitanswer(answer.substring(excel2007.getmaxtextlength())); } }); }通过optional优化(251点数解答 | 2024-05-20 11:25:30)200
- list faqsimilars = new arraylist<>(); list faqbatchexpansionresultdto = objectmapper.readvalue(is, new typereference>() {}); if(collectionutils.isnotempty(faqbatchexpansionresultdto)){ faqbatchexpansionresultdto.foreach(e->{ if(collectionutils.isnotempty(e.getsmartextends())){ e.getsmartextends().foreach(s->{ s.getextend().foreach(extend->{ faqsimilar fa(327点数解答 | 2024-05-24 15:26:53)273
- list faqsimilars = new arraylist<>(); list faqbatchexpansionresultdto = objectmapper.readvalue(is, new typereference>() {}); if(collectionutils.isnotempty(faqbatchexpansionresultdto)){ faqbatchexpansionresultdto.foreach(e->{ if(collectionutils.isnotempty(e.getsmartextends())){ e.getsmartextends().foreach(s->{ s.getextend().foreach(extend->{ faqsimilar fa(109点数解答 | 2024-05-24 15:27:15)196
- 基于这段代码为您进行补充完善 package com.example.news.models class user( val username: string, val email: string, val gender: string ) { // 如果需要默认构造函数,可以添加 constructor() : this("", "", "") }和package com.example.news.models import java.io.serializable class news( val title: string, val content: string, val publisher: string, val publishtime: string = java.util.date().tostring() ) : serializable { }和package com.example.news.models data class comment( val content: string, val commenter: string, var date:string,(215点数解答 | 2024-12-13 19:41:46)245
- 继承以上rect类,设计一个newrect类,要求添加一个数据成员,用以存放矩形位置, 位置坐标通常为矩形左上角坐标,用元组表示,例如(x,y),然后 修改构造方法; 设计move()方法,将矩形从一个位置移动到另一个位置; 设计size()方法改变矩形大小; 设计where()返回矩形左上角的坐标值。 class rect: def __init__(self,length,width): self.length=length self.width=width def perimeter(self): return 2*(self.length+self.width) def area(self): return self.length*self.width def show(self): print("该矩形的信息如下:") print("长=",self.length,end=",") p(110点数解答 | 2025-01-02 23:42:09)173
- 继承以上rect类,设计一个newrect类,要求添加一个数据成员,用以存放矩形位置, 位置坐标通常为矩形左上角坐标,用元组表示,例如(x,y),然后 修改构造方法; 设计move()方法,将矩形从一个位置移动到另一个位置; 设计size()方法改变矩形大小; 设计where()返回矩形左上角的坐标值。 class rect: def __init__(self,length,width): self.length=length self.width=width def perimeter(self): return 2*(self.length+self.width) def area(self): return self.length*self.width def show(self): print("该矩形的信息如下:") print("长=",self.length,end=",") p(94点数解答 | 2025-01-02 23:42:11)163
- 继承以上rect类,设计一个newrect类,要求添加一个数据成员,用以存放矩形位置, 位置坐标通常为矩形左上角坐标,用元组表示,例如(x,y),然后 修改构造方法; 设计move()方法,将矩形从一个位置移动到另一个位置; 设计size()方法改变矩形大小; 设计where()返回矩形左上角的坐标值。 class rect: def __init__(self,length,width): self.length=length self.width=width def perimeter(self): return 2*(self.length+self.width) def area(self): return self.length*self.width def show(self): print("该矩形的信息如下:") print("长=",self.length,end=",") p(94点数解答 | 2025-01-02 23:42:12)183
- 给以下代码进行注释: fn czzb a b c=(--已知三点a、b、c,求c点在ab直线上的垂足坐标 ab=b-a; ac=c-a; lab=length ab; lac=length ac; cosct=((dot ab ac)/(lab*lac));--求出cosct abxl=if cosct>=0 then ab/lab;else -1*(ab/lab)--ab的单位向量 lty=abs (lac*cosct);--求出投影长度 xl=lty*abxl;--求出偏移向量 return (a+xl);--返回垂足坐标 ) -- fn qiumianji v1 v2 v3=( -- local chang=length (v3-v1); -- local v0=czzb v1 v3 v2; -- local gao=length (v0-v2) -- local mj=0.5*chang*gao; -- return mj; -- ) fn qiumianji v1 v2 v3=( local a=length (v1-v2); local(324点数解答 | 2024-10-16 18:51:32)192
- #include <iostream> #include<cstring> using namespace std; class vehicle{ public: void run(); string getname(); vehicle(string name); string name; }; vehicle::vehicle(string name){ this->name = name; } void vehicle::run(){ cout<<"出发"<<endl; } string vehicle::getname(){ return name; } class car:public vehicle{ public: void break(); void display(); car(int seats,string color,string type,int power,string name); en(65点数解答 | 2024-05-26 17:01:16)266
- #include <iostream> #include<cstring> using namespace std; class vehicle{ public: void run(); string getname(); vehicle(string name); string name; }; vehicle::vehicle(string name){ this->name = name; } void vehicle::run(){ cout<<"出发"<<endl; } string vehicle::getname(){ return name; } class car:public vehicle{ public: void break(); void display(); car(int seats,string color,string type,int power,string name); en(373点数解答 | 2024-05-26 17:02:18)256
- public partial class form1 : form { public string vintext = ""; public int vin_number = 0; public struct vin_info { public int row; public string vin_number; public string vin_type; public string vin_car; public string vin_enter; public string vin_out; public string vin_go; public string vin_arrive; } public list<vin_info> vin_infos=new list<vin_info>(); public form1() { initializecomponent()(39点数解答 | 2024-11-05 15:09:08)204
- package com.example.news.models class user( val username: string, val email: string, val gender: string ) { // 如果需要默认构造函数,可以添加 constructor() : this("", "", "") }和package com.example.news.models import java.io.serializable class news( val title: string, val content: string, val publisher: string, val publishtime: string = java.util.date().tostring() ) : serializable { }和package com.example.news.models data class comment( val content: string, val com(33点数解答 | 2024-12-13 19:38:40)174