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Remove multiple keys from Map in efficient way?
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Just for the sake of completeness:
As guessed java.util.AbstractSet#removeAll really iterates over all entries, but with one little trick: It uses the iterator of the smaller collection:
if (size() <= collection.size()) {
Iterator<?> it = iterator();
wh...
How to remove newlines from beginning and end of a string?
...g::trim method has a strange definition of whitespace.
As discussed here, Java 11 adds new strip… methods to the String class. These use a more Unicode-savvy definition of whitespace. See the rules of this definition in the class JavaDoc for Character::isWhitespace.
Example code.
String input =...
Null check in an enhanced for loop
What is the best way to guard against null in a for loop in Java?
11 Answers
11
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What is the difference between native code, machine code and assembly code?
...hine code. It contrasts with managed code, which is written in C#, VB.NET, Java, or similar, and executed in a virtual environment (such as .NET or the JavaVM) which kind of “simulates” a processor in software. The main difference is that managed code “manages” the resources (mostly the memo...
How to use Jackson to deserialise an array of objects
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For those working with Agents in Java, Lotus Domino, this is the way to go. I tried some of the other solutions, but always got a ResourceNotFoundException
– John
Mar 8 '17 at 14:38
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How to check if a String contains only ASCII?
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You can do it with java.nio.charset.Charset.
import java.nio.charset.Charset;
public class StringUtils {
public static boolean isPureAscii(String v) {
return Charset.forName("US-ASCII").newEncoder().canEncode(v);
// or "ISO-8859-1"...
Can inner classes access private variables?
...ner can access the member variable var of an object of type Outer.
Unlike Java though, there is no correlation between an object of type Outer::Inner and an object of the parent class. You have to make the parent child relationship manually.
#include <string>
#include <iostream>
class...
How do I check if an integer is even or odd? [closed]
...it in C, despite chustar mentioning they couldn't work out how to do it in Java. I did not claim or imply this was a Java answer, I do not know Java. I think I just got my first downvote and am confused as to why. Oh well.
– Chris Young
Oct 2 '08 at 5:49
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android ellipsize multiline textview
...en the text becomes ellipsized, which I found quite useful myself.
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.graphics.Canvas;
import android.text.Layout;
import android.text.Layout.Alignment;
import android.text.StaticLayout;
import android.t...
How to auto-format code in Eclipse?
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Another option is to go to Window->Preferences->Java->Editor->SaveActions and check the Format source code option. Then your source code will be formatted truly automatically each time you save it.
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