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“Field can be converted to a local variable” message appearing when setting Android ActionBar colour

What the warning is telling you is that actionBarColor shouldn’t be a global variable (i.e. a field), because it’s only used in one method (onCreate). This is good advice: you should...

April 4, 2022
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Finding the size of a char array in Java

You can use b.length to find out how many characters there are. This is only the number of characters, not indexing, so if you iterate over it with a for loop, remember to...

April 4, 2022
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How to use Java AWT setBackground

You have added the JPanel over the JFrame which completely blocks out the underlying container on which you have set the color. You could do this instead: public Gui(String title) { super(title); JPanel...

April 4, 2022
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Java: Increment by 2 the two inputted integer

Some Notes: 1- in.nextInt(); reads an integer from the user, blocks until the user enters an integer into the console and presses ENTER. The result integer has to be saved in order...

April 4, 2022
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Convert an integer to an array of digits

The immediate problem is due to you using <= temp.length() instead of < temp.length(). However, you can achieve this a lot more simply. Even if you use the string approach, you can...

April 4, 2022
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Picked up _JAVA_OPTIONS: -Xmx256M

April 4, 2022
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how to make jni.h be found?

April 4, 2022
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When to use static methods

One rule-of-thumb: ask yourself “Does it make sense to call this method, even if no object has been constructed yet?” If so, it should definitely be static. So in...

April 4, 2022
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How to serialize an object into a string

Sergio: You should use BLOB. It is pretty straighforward with JDBC. The problem with the second code you posted is the encoding. You should additionally encode the bytes to make...

April 4, 2022
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Java: How to set Precision for double value?

You can’t set the precision of a double (or Double) to a specified number of decimal digits, because floating-point values don’t have decimal digits. They have binary digits. You...

April 4, 2022
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