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Using an object from main class in another class


Using an object from main class in another class

By : mike2500
Date : November 22 2020, 09:00 AM
fixed the issue. Will look into that further Your Forward class obviously needs a reference to the two motor instances. You should forward (no pun intended) them at construction time:
code :
public class Forward {
    private final RegulatedMotor left;
    private final RegulatedMotor right;

    public Forward(RegulatedMotor left, RegulatedMotor right) {
        this.left = left;
        this.right = right;
    }

    public void moveForward() { ... }
}
Forward forward = new Forward(left, right);


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how to execute function from first class by second class object placed in main class?

how to execute function from first class by second class object placed in main class?


By : karora
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I'll show you the way to do it with the Notification Center. You could also use delegates and devise a Protocol, but this is a very simple approach.
In WorkspaceView.m:
code :
#import "WorkspaceView.h"
@implementation WorkspaceView
...

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInView:self];
//howto execute showMenu or hideMenu from MainMenuView using mainMenuView object in ViewController?
[[NSNotificationCenter defaultCenter] postNotificationName:@"SHOW_MENU" object:nil];

NSLog(@"workspace"); // <-it's work;
}

@end
#import "MainMenuView.h"

@implementation MainMenuView

- (id)initWithFrame:(CGRect)frame{
    [[NSNotificationCenter defaultCenter] addObserver:self 
                                         selector:@selector(handleShowMenu:) 
                                             name:@"SHOW_MENU" object:nil];
}

- (void)handleShowMenu:(NSNotification*)note
{
    [self showMenu];
}

-(void)hideMenu{
self.frame = CGRectMake(0, -1 * self.frame.size.height, self.frame.size.width, self.frame.size.height);
}

-(void)showMenu{
self.frame = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);
}

@end
class to return an object array with member attributes that can be accessed from main class

class to return an object array with member attributes that can be accessed from main class


By : Alex Tully
Date : March 29 2020, 07:55 AM
Any of those help When you create an array of parse objects the array itself is empty and doesn't actually contain any objects, only null references. You also need to create the objects themselves and store them in the array.
Furthermore, your point is a member of your parse class when it should be a local variable of your convert method, which itself should be static, since it doesn't rely on a particular instance.
code :
parse[] test = parse.convert("this string not used yet");

System.out.printf("%.2f %.2f %.2f %d\n", test[0].x, test[0].y, test[0].z, test[0].r);
public class parse {

    public float x;
    public float y;
    public float z;
    public int r;

    parse() {

    }

    public static parse[] convert(String vertices) {

        // parse string vertices -> object

        parse[] point = new parse[1000];
        point[0] = new parse();
        point[0].x = 10;
        point[0].y = 100;
        point[0].z = 50;
        point[0].r = 5;

        return point;
    }
}
Java calling function or using object from Main class in sub class

Java calling function or using object from Main class in sub class


By : Storm49152
Date : March 29 2020, 07:55 AM
With these it helps You say that ConsoleDebug is a subclass. Maybe you need to declare as such:
code :
public class ConsoleDebug extends MainClass{
How to get to a data object of class A from Class B (not from the main class)

How to get to a data object of class A from Class B (not from the main class)


By : Plamen Dimitrov
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further
what would be the best way to reach the dataview object of class A from class B?
How can I access the main class object from a function inside the class in Java?

How can I access the main class object from a function inside the class in Java?


By : junyour
Date : March 29 2020, 07:55 AM
This might help you Yes, you should use Field.this to access the Field instance from within the anonymous class instance.
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