Java keyword this in Objective C - objective-c

Question

First day learning Objective-C but have a java background. I'd like to use the same variable name for my parameter that I do for my instance variable. In java we do it like this
public class Person
{
private String name;
private String age;
public void setName(String name)
{
this.name = name;
}
public void setAge(String age)
{
this.age = age;
}
}
In objective c so far I have this
#interface Person : NSObject
{
int age;
int name;
}
-(void) setAge:(int) age;
-(void) setName:(int) name;
-(int) getAge;
-(int) getName;
#end
#implementation Person
-(void) setName:(int) w
{
weight = w;
}
-(void) setAge:(int) a
{
age = a;
}
-(int) getName
{
return name;
}
-(int) getAge
{
return age;
}
#end

Answer 1

In Objective-C, you can define your own accessors or use #syntehsize to create them automatically for you.
In the case where you want to define accessors manually, setters are declared like this:
- (void)setName:(NSString *)name {
self.name = name;
}
- (void)setAge:(NSInteger)age {
self.age = age;
}
For getters, you simply declare them as follows:
- (NSString *)name {
return self.name;
}
- (NSInteger)age {
return self.age;
}

Answer 2

Objective-C programmers don't like typing, so we do it like this:
#interface Person : NSObject
#property(nonatomic, copy) NSString *name;
#property(nonatomic, assign) int age;
#end
#implementation Person
#end
You may want to start by reading Apple's Objective-C Programming Language introduction.

Answer 3

in ObjectiveC the way to refer to 'this' is 'self'

Answer 4

You have this in ObjectiveC because you are using C style variables. If you declare that variables as ObjectiveC properties and use the correct synthesize instruction:
#property (int) age;
#synthesize age;
Then you can refer to them through self.age
self.age = age;
in the implementation file. This will internally call the -(void)setAge:(int)age method and the -(int) age methods which will be defined automatically.
Finally since an ObjectiveC object is nothing more than a pointer to a C struct you can access variables by skipping ObjectiveC by using the syntax to refer to fields of a pointer to a struct: self->age = age