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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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The split() method in Java does not work on a dot (.) [duplicate]
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It works fine. Did you read the documentation? The string is converted to a regular expression.
. is the special character matching all input characters.
As with any regular expression special character, you escape with a \. You need an additional \ for the Java string escape.
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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 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 ...
Simple way to encode a string according to a password?
... @smehmood I'm getting the following error 'str' object cannot be interpreted as an integer
– Rohit Khatri
Nov 16 '16 at 12:23
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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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How To Get IPython Notebook To Run Python 3?
.... If you have any notebooks saved with python 2 then it will automatically convert them to Python 3 once you open the notebook.
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How many characters can a Java String have?
...em from Sphere Online Judge (SPOJ) where I need to find a palindrome for a integer of up to a million digits. I thought about using Java's functions for reversing Strings, but would they allow for a String to be this long?
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