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Java Immutable Collections
From Java 1.6 Collection Framework documentation :
6 Answers
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How do you find all subclasses of a given class in Java?
... subclasses of a given class (or all implementors of a given interface) in Java?
As of now, I have a method to do this, but I find it quite inefficient (to say the least).
The method is:
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How to suppress Java warnings for specific directories or files such as generated code
...It is configurable through a project's build path: Project properties > Java Build Path > Compiler > Source
Announced here: Eclipse 3.8 and 4.2 M6 - New and Noteworthy, called Selectively ignore errors/warnings from source folders. That's also where the screenshot is from. This is the ne...
Why is String.chars() a stream of ints in Java 8?
In Java 8, there is a new method String.chars() which returns a stream of int s ( IntStream ) that represent the character codes. I guess many people would expect a stream of char s here instead. What was the motivation to design the API this way?
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How to convert an int array to String with toString method in Java [duplicate]
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What you want is the Arrays.toString(int[]) method:
import java.util.Arrays;
int[] array = new int[lnr.getLineNumber() + 1];
int i = 0;
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System.out.println(Arrays.toString(array));
There is a static Arrays.toString helper method for every different primitive java type; th...
How to make ThreadPoolExecutor's submit() method block if it is saturated?
...nHandler for that or is there an existing way to do this using a standard Java library?
17 Answers
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Add leading zeroes to number in Java? [duplicate]
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String.format (https://docs.oracle.com/javase/1.5.0/docs/api/java/util/Formatter.html#syntax)
In your case it will be:
String formatted = String.format("%03d", num);
0 - to pad with zeros
3 - to set width to 3
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How to get an enum value from a string value in Java?
...reated at compile time and do not appear in source code. They do appear in Javadoc, though; for example, Dialog.ModalityType shows both methods.
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Returning null as an int permitted with ternary operator but not if statement
Let's look at the simple Java code in the following snippet:
8 Answers
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warning: [options] bootstrap class path not set in conjunction with -source 1.5
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From a blog post:
To use javac from JDK N to cross-compiler to an older platform version, the correct practice is to:
Use the older -source setting.
Set the bootclasspath to compile against the rt.jar (or equivalent) for the older platform....