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Best way to make Java's modulus behave like it should with negative numbers?
...a % b + b) would become larger than b. Therefore, (a % b + b) % b turns it into smaller than b again (and doesn't affect negative a values).
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How to evaluate a math expression given in string form?
...r.getEngineByName("JavaScript");
String foo = "40+2";
System.out.println(engine.eval(foo));
}
}
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Hide Utility Class Constructor : Utility classes should not have a public or default constructor
...es
// class is final and the constructor is private
public static int myUtilityMethod(int x) {
return x * x;
}
}
you can call this using
int y = MyUtils.myUtilityMethod(5); // returns 25.
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What is the difference between map and flatMap and a good use case for each?
...ses are red", "Violets are blue")
Now, map transforms an RDD of length N into another RDD of length N.
For example, it maps from two lines into two line-lengths:
rdd.map(_.length).collect
res1: Array[Int] = Array(13, 16)
But flatMap (loosely speaking) transforms an RDD of length N into a ...
Why is the Windows cmd.exe limited to 80 characters wide?
...|tg] [idsr=on|off]
Device Status: MODE [device] [/STATUS]
Redirect printing: MODE LPTn[:]=COMm[:]
Select code page: MODE CON[:] CP SELECT=yyy
Code page status: MODE CON[:] CP [/STATUS]
Display mode: MODE CON[:] [COLS=c] [LINES=n]
Typematic rate: MODE CON[:] [RATE=r DELAY=d]
If y...
Objective-C pass block as parameter
...ype. In the general case, block types are declared the same way function pointer types are, but replacing the * with a ^. One way to pass a block to a method is as follows:
- (void)iterateWidgets:(void (^)(id, int))iteratorBlock;
But as you can see, that's messy. You can instead use a typedef to ...
Use Mockito to mock some methods but not others
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+1 for pointing out the difference between doReturn(retval).when(spyObj).methodName(args) and when(spyObj.methodName(args)).thenReturn(retval)
– Captain_Obvious
Nov 12 '18 at 23:44
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What is the difference between ArrayList.clear() and ArrayList.removeAll()?
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public void clear() {
modCount++;
// Let gc do its work
for (int i = 0; i < size; i++)
elementData[i] = null;
size = 0;
}
The source code for removeAll()(As defined in AbstractCollection):
public boolean removeAll(Collection<?> c) {
boolean modified = false...
Clear android application user data
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The command line tools are not intdended for usage by applications. Likely they will only work for the semi-privileged adb shell user, which is treated as somewhat comparable in authority to a user pushing buttons in GUI if the system settings app.
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What is a mutex?
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Mutual Exclusion. Here's the Wikipedia entry on it.
The point of a mutex is to synchronize two threads. When you have two threads attempting to access a single resource, the general pattern is to have the first block of code attempting access, to set the mutex before entering the co...