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“Java DateFormat is not threadsafe” what does this leads to?
Everybody cautions regarding Java DateFormat not being thread safe and I understand the concept theoretically.
11 Answers
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Java's Virtual Machine and CLR
...s a sort of follow up to the question called Differences between MSIL and Java bytecode? , what is the (major) differences or similarity in how the Java Virtual Machine works versus how the .NET Framework Common Language Runtime (CLR) works?
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Maven Run Project
Is there a Maven "phase" or "goal" to simply execute the main method of a Java class? I have a project that I'd like to test manually by simply doing something like "mvn run".
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What is the maximum depth of the java call stack?
...at this is tail recursive and shouldn't ever overflow? Edit: Sorry. In Java it crashed at 8027; in Scala it got up to 8594755 before I got bored.
– arya
Feb 15 '15 at 2:47
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What is boxing and unboxing and what are the trade offs?
...e the expected metadata and structure that other data structures have.
In Java and Haskell generic collections can't contain unboxed values. Generic collections in .NET can hold unboxed values with no penalties. Where Java's generics are only used for compile-time type checking, .NET will generat...
How to format a Java string with leading zero?
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You can use StringUtils or DecimalFormat for Java 1.4 and below. Check here javadevnotes.com/java-integer-to-string-with-leading-zeros
– JavaDev
Mar 5 '15 at 3:40
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Read String line by line
...impler, but the Reader implementation beats the others hands down.
import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
/**
* Test class for splitting a string into lines at linebreaks
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How to solve java.lang.NoClassDefFoundError?
I've tried both the example in Oracle's Java Tutorials . They both compile fine, but at run-time, both come up with this error:
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Is there a Java standard “both null or equal” static method?
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With Java 7 you can now directly do a null safe equals:
Objects.equals(x, y)
(The Jakarta Commons library ObjectUtils.equals() has become obsolete with Java 7)
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What is the default scope of a method in Java?
...e permissive than private scope.
More information:
http://docs.oracle.com/javase/tutorial/java/javaOO/accesscontrol.html
http://mindprod.com/jgloss/scope.html
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