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Simple way to repeat a String in java
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Commons Lang StringUtils.repeat()
Usage:
String str = "abc";
String repeated = StringUtils.repeat(str, 3);
repeated.equals("abcabcabc");
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HTTP URL Address Encoding in Java
...the documentation docs.oracle.com/javase/1.4.2/docs/api/java/net/…, java.lang.String, java.lang.String, int, java.lang.String, java.lang.String, java.lang.String)
– madoke
Oct 10 '12 at 14:17
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Named placeholders in string formatting
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StrSubstitutor of jakarta commons lang is a light weight way of doing this provided your values are already formatted correctly.
http://commons.apache.org/proper/commons-lang/javadocs/api-3.1/org/apache/commons/lang3/text/StrSubstitutor.html
Map<String,...
How to make pipes work with Runtime.exec()?
..., except it was "ps -ef | grep someprocess".
At least with "ls" you have a language-independent (albeit slower) Java replacement. Eg.:
File f = new File("C:\\");
String[] files = f.listFiles(new File("/home/tihamer"));
for (String file : files) {
if (file.matches(.*some.*)) { System.out.printl...
How do I assert equality on two classes without an equals method?
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I generally implement this usecase using org.apache.commons.lang3.builder.EqualsBuilder
Assert.assertTrue(EqualsBuilder.reflectionEquals(expected,actual));
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Clojure: cons (seq) vs. conj (list)
... the class of the return value:
(class (conj '(1 2 3) 4))
; => clojure.lang.PersistentList
(class (cons 4 '(1 2 3))
; => clojure.lang.Cons
Note that these are not really interchangeable; in particular, clojure.lang.Cons does not implement clojure.lang.Counted, so a count on it is no longer...
Can I obtain method parameter name using Java reflection?
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In Java 8 you can do the following:
import java.lang.reflect.Method;
import java.lang.reflect.Parameter;
import java.util.ArrayList;
import java.util.List;
public final class Methods {
public static List<String> getParameterNames(Method method) {
Parame...
Sending a notification from a service in Android
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This type of Notification is deprecated as seen from documents:
@java.lang.Deprecated
public Notification(int icon, java.lang.CharSequence tickerText, long when) { /* compiled code */ }
public Notification(android.os.Parcel parcel) { /* compiled code */ }
@java.lang.Deprecated
public void set...
How can I pad an integer with zeros on the left?
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Use java.lang.String.format(String,Object...) like this:
String.format("%05d", yournumber);
for zero-padding with a length of 5. For hexadecimal output replace the d with an x as in "%05x".
The full formatting options are document...
What's the best way to build a string of delimited items in Java?
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Pre Java 8:
Apache's commons lang is your friend here - it provides a join method very similar to the one you refer to in Ruby:
StringUtils.join(java.lang.Iterable,char)
Java 8:
Java 8 provides joining out of the box via StringJoiner and String.joi...