Java Questions & Answers

Java Pass Method as Parameter

I want to know to pass a method by reference. I know that Java does not pass methods as parameters, however, I would like to get an…

Java

1 Answer · 1.5K Views · Answered ✓

P Asked by: Pavithra Shah · 5 years ago

Java switch statement: Constant expression required, but is it constant?

So, I am working on this class that has a few static constants:public abstract class Foo { ... public static final int BAR; public static final int…

Java

1 Answer · 3.7K Views · Answered ✓

C Asked by: Colin Payne · 5 years ago

How can I convert Java bitmap to byte array?

Bitmap bmp = intent.getExtras().get("data"); int size = bmp.getRowBytes() * bmp.getHeight(); ByteBuffer b = ByteBuffer.allocate(size);…

Java

1 Answer · 1.5K Views · Answered ✓

K Asked by: Kayla Shinn · 5 years ago

Java - No enclosing instance of type Foo is accessible

Java

1 Answer · 1.4K Views · Answered ✓

K Asked by: Kato Saito · 5 years ago

ValueError: DataFrame constructor not properly called! with pandas

def multiple_dfs(xyz_file, sheet, *args):row=2 writer = pd.ExcelWriter(xyz_file, engine='openpyxl') df = pd.DataFrame({'user': ['A', 'B', 'C'],…

Java

1 Answer · 1.7K Views · Answered ✓

A Asked by: Antony Bence · 2028 years ago

map vs mapValues in Spark

I'm currently learning Spark and developing custom machine learning algorithms. My question is what is the difference between .map() and .mapValues()…

Java

1 Answer · 540 Views · Answered ✓

A Asked by: Aashna Saito · 2028 years ago

Mongoose Schema hasn't been registered for model

I'm learning the mean stack and when I try to start the server usingnpm startI get an exception saying that:schema hasn't been registered for model…

Java

2 Answers · 2.3K Views · Answered ✓

A Asked by: Arun Singh · 2028 years ago