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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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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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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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How to highlight text using javascript
...diacritic characters, as implemented in mark.js. 3. HTML notations will be converted to the actual characters in the browser DOM, so you also absolutely use them!
– dude
May 24 '16 at 5:30
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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 ...
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 ...
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...
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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