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How can I pad an integer with zeros on the left?
How do you left pad an int with zeros when converting to a String in java?
16 Answers
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Alternatives to java.lang.reflect.Proxy for creating proxies of abstract classes (rather than interf
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It can be done using Javassist (see ProxyFactory) or CGLIB.
Adam's example using Javassist:
I (Adam Paynter) wrote this code using Javassist:
ProxyFactory factory = new ProxyFactory();
factory.setSuperclass(Dog.class);
factory.setFilter(
n...
Difference between null and empty (“”) Java String
...ength()
a.substring(0, 1)
and so on.
If the String equals null, like b, Java would throw a NullPointerException if you tried invoking, say:
b.length()
If the difference you are wondering about is == versus equals, it's this:
== compares references, like if I went
String a = new String("");...
How to pass an ArrayList to a varargs method parameter?
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@JoshM. Java needs a lot of things. ;) I also (coming from a C# background) miss index operators. Working with dictionaries is much more smooth in C# than working with HashMaps in Java.
– Per Lundberg
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When is a Java method name too long? [closed]
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A name in Java, or any other language, is too long when a shorter name exists that equally conveys the behavior of the method.
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Best way to compare 2 XML documents in Java
...r XMLUnit 1 on SourceForge. Also, the sourceforge page states "XMLUnit for Java 1.x will still be maintained".
– Yngvar Kristiansen
Feb 25 '16 at 8:00
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Write a program that will surely go into deadlock [closed]
...he comments.)
Exercise to the reader #2: demonstrate the same deadlock in Java. (An answer is here: https://stackoverflow.com/a/9286697/88656)
class MyClass
{
static MyClass()
{
// Let's run the initialization on another thread!
var thread = new System.Threading.Thread(Initialize);
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Java 8 Stream and operation on arrays
I have just discovered the new Java 8 stream capabilities. Coming from Python, I was wondering if there was now a neat way to do operations on arrays like summing, multiplying two arrays in a "one line pythonic" way ?
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Java 8 List into Map
I want to translate a List of objects into a Map using Java 8's streams and lambdas.
21 Answers
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Java: convert List to a String
JavaScript has Array.join()
22 Answers
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