getter

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Why use getters and setters? I have read books on Java , saying that it is good to create setters and getters for variables such as x and y . For example: public int getX(){ return x; } public void setX(int x){ this.x = x; } But what is the difference from that and ...(shape.x)... // basically getX() and shape.x = 90; // basically setX() If setters and getters are better, could you explain to me what practical

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Why use getters and setters? I have read books on Java , saying that it is good to create setters and getters for variables such as x and y . For example: public int getX(){ return x; } public void setX(int x){ this.x = x; } But what is the difference from that and ...(shape.x)... // basically getX() and shape.x = 90; // basically setX() If setters and getters are better, could you explain to me what practical

问题 What is the getBean() method doing here and how does it work in a program? ApplicationContext aplicntxt = new ClassPathXmlApplicationContext("springconfig.xml"); Hello h = (Hello) aplicntxt.getBean("springconfig.xml"); h.display(); Hello h2 = new Hello(); //if I write this h2.display(); My question is why h2.display retrieves null value and h.display retrieves the stored values through springconfig.xml? Please tell me what does ApplicationContext aplicntxt = new ClassPathXmlApplicationContext

问题 I'd like to map from a java.util.Map to a complex type, let's call it Abc. <mapping> <class-a>java.util.Map</class-a> <class-b bean-factory="xyz.AbcBeanFactory" factory-bean-id="AbcBeanFactory"> xyz.Abc </class-b> <field> <a>Name</a> <b>companyName</b> </field> </mapping> With that I get this error (which is comprehensible): org.dozer.MappingException: No read or write method found for field (Name) in class (interface java.util.Map) Ok, how do I map from a java.util.Map that has an entry with

问题 Is there a notion of "string-indexed" getters in spring context setup XML language? Suppose I have Person getter with the following prototype: class Person { Person getRelative(String relativeName); ... } Can I access it with something like <bean id="Bob" class="Person"/> <bean id="Barnyard" class="Company"> <property name="owner" ref="Bob.relative.father"/> </bean> saying that Bob's father is the owner of Barnyard company. The Company prototype is like follows: class Company { Person

问题 hi i am new to ios dev ,I am trying to set a value for nsstring from delegate class and access from other class ,the value i get is null.i dont know what mistake i am doing? //token class header file @interface TokenClass : NSObject { NSString *tokenValue; } @property (nonatomic,strong) NSString *tokenValue; //token class main file @implementation TokenClass @synthesize tokenValue; @end //App Delegate TokenClass *token = [[TokenClass alloc]init]; [token setTokenValue:@"as"]; when i access

问题 @interface ViewController : UIViewController{ NSNumber *nmbr; } @property (nonatomic, readonly) NSNumber *nmbr; - (NSNumber*)nmbr; - (void)setNmbr:(NSNumber *)value; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; [self setNmbr:[NSNumber numberWithInt:4]]; NSLog(@"Value of number is: %@", self.nmbr); } - (NSNumber*)nmbr{ return nmbr; } - (void)setNmbr:(NSNumber *)value{ nmbr = value; } @end I am expecting the program not to let setNmbr function work because nmbr

问题 I need to fix my addQuiz() in my student class. Then, with that class, I pull all the info into my main of prog2. I have everything working except two things. I need to get the formula fixed for my addQuiz() so it totals the amount of points entered, and fix the while statement in my main so that I can enter a word to tell the program that I am done entering my quizzes. Here is my main file. import java.util.Scanner; public class Prog2 { public static void main(String[] args) { Scanner in =

问题 I have to create a code that takes user input for grades based on a students name that the user has inputted. The input is to stop when a number less than 0 is inputted and the output should be the student name, the total of all the scores, and the average score. For some reason I cannot get the average or the total to print, and my counter in my student class is showing an error "remove this token '++'" Here is my main class, and my student class : /** * COSC 210-001 Assignment 2 * Prog2

问题 PHP has magic methods like __get() and __set() . Is there any alternative for it in vb.net. Or is there any other tricks that can be done instead? This was what i done in php private $data = array(); public function __construct($arData) { $data['var1'] = 'value1'; $data['var2'] = 'value2'; $data['var3'] = 'value3'; } public function __get($propertyName) { if(!array_key_exists($propertyName, $this->data)) throw new Exception("Invalid property"); else return $this->data[$propertyName]; } Now i