Greenfoot

Atharva1912

2020/4/14

#

isFalling() Returns a boolean value indicating whether this particle is in free-fall or not. A particle is falling if it is above the maximum y value and there is nothing in the space immediately underneath it. Be sure not to access the world out of bounds (you cannot fall outside the world).

 public boolean isFalling()
    {
        if (this.getWorld() != null)
        {
            return (this.getGridY() < 
                this.getWorld().getHeight() - 1
                && this.getWorld().getOneObjectAtOffset(this.getGridX(),
                    this.getGridY() + 1, Particle.class == null));
        }
        return false; 
    }

I have written the above code, but It's showing an error saying "Cannot find Symbol - method getOneAtObjectAtOffset(int, int, boolean)

danpost

2020/4/14

#

Move exactly one parenthesis around to the other side of " == null".

Atharva1912

2020/4/14

#

I might be really dumb, But I could not figure out what exactly I need to do. Sorry

danpost

2020/4/14

#

Atharva1912 wrote...

I might be really dumb, But I could not figure out what exactly I need to do. Sorry

There is only one place in the given code where " == null" occurs and looking at both sides, only one has parenthesis. Take the closest one and move it to the other side of " == null".

Atharva1912

2020/4/14

#

danpost wrote...

Atharva1912 wrote...

I might be really dumb, But I could not figure out what exactly I need to do. Sorry

There is only one place in the given code where " == null" occurs and looking at both sides, only one has parenthesis. Take the closest one and move it to the other side of " == null".

Hey, I tried doing as you suggested, but it still shows the same error.

danpost

2020/4/14

#

Show your updated method.

Atharva1912

2020/4/14

#

public boolean isFalling()
    {
        if (this.getWorld() != null)
        {
            return (this.getGridY() < 
                this.getWorld().getHeight() - 1
                && this.getWorld().getOneObjectAtOffset(this.getGridX(),
                    this.getGridY() + 1, Particle.class (== null);
        }
        return false; 
    }

danpost

2020/4/14

#

I said move it -- not change it. Line 8 should be:

this.getGridY() + 1, Particle.class) = null);

Atharva1912

2020/4/14

#

danpost wrote...

I said move it -- not change it. Line 8 should be:

this.getGridY() + 1, Particle.class) = null);

Got it Thank you so much

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I want to write a method that detects if a particle is falling.