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What is Serialization and deserialization?
What is Serialization and deserialization? Serialization is the process of writing the state of an object to a byte stream. Deserialization is the process of restoring these objects. 2012-08-09, 2838👍, 0💬

How do you delete a Cookie within a JSP?
How do you delete a Cookie within a JSP? Cookie mycook = new Cookie("name","value"); response.addCookie(mycook); Cookie killmycook = new Cookie("mycook","value"); killmycook.setMaxAge(0); killmycook.setPath("/"); killmycook.addCookie(killmycoo k); 2013-08-10, 2832👍, 0💬

How do you match one letter in the current locale?
How do you match one letter in the current locale? /[^\W_\d]/ We don't have full POSIX regexps, so you can't get at the isalpha() &lt;ctype.h&gt; macro save indirectly. You ask for one byte which is neither a non-alphanumunder, nor an under, nor a numeric. That leaves just the alphas, which ... 2013-09-23, 2830👍, 0💬

How do you give functions private variables that retain their values between calls?
How do you give functions private variables that retain their values between calls? Create a scope surrounding that sub that contains lexicals. Only lexical variables are truly private, and they will persist even when their block exits if something still cares about them. Thus: { my $i = 0; sub next... 2013-09-25, 2828👍, 0💬

I see code like ...
I see code like char *p = malloc(strlen(s) + 1); strcpy(p, s); Shouldn't that be malloc((strlen(s) + 1) * sizeof(char))? It's never necessary to multiply by sizeof(char), since sizeof(char) is, by definition, exactly 1. (On the other hand, multiplying by sizeof(char) doesn't hurt, and in some circum... 2016-06-21, 2827👍, 0💬

Can an inner class declared inside of a method access local variables of this method?
Can an inner class declared inside of a method access local variables of this method? It's possible if these variables are final. 2012-06-19, 2827👍, 0💬

Can a .java file contain more than one java classes?
Can a .java file contain more than one java classes? Yes, a .java file contain more than one java classes, provided at the most one of them is a public class. 2013-06-24, 2823👍, 0💬

How are the elements of a BorderLayout organized?
How are the elements of a BorderLayout organized? The elements of a BorderLayout are organized at the borders (North, South, East, and West) and the center of a container. 2012-11-08, 2823👍, 0💬

How can you add properties to an object?
How can you add properties to an object? 2013-10-23, 2822👍, 0💬

If a class is declared without any access modifiers, where may the class be accessed?
If a class is declared without any access modifiers, where may the class be accessed? A class that is declared without any access modifiers is said to have package or friendly access. This means that the class can only be accessed by other classes and interfaces that are defined within the same pack... 2012-07-19, 2822👍, 0💬

How many bits are used to represent Unicode, ASCII, UTF-16, and UTF-8 characters?
How many bits are used to represent Unicode, ASCII, UTF-16, and UTF-8 characters? Unicode requires 16 bits and ASCII require 7 bits. Although the ASCII character set uses only 7 bits, it is usually represented as 8 bits. UTF-8 represents characters using 8, 16, and 18 bit patterns. UTF-16 uses 16-bi... 2012-06-22, 2822👍, 0💬

What are three ways in which a thread can enter the waiting state?
What are three ways in which a thread can enter the waiting state? A thread can enter the waiting state by invoking its sleep() method, by blocking on IO, by unsuccessfully attempting to acquire an object's lock, or by invoking an object's wait() method. It can also enter the waiting state by invoki... 2012-06-04, 2821👍, 0💬

Is Iterator a Class or Interface? What is its use?
Is Iterator a Class or Interface? What is its use? Iterator is an interface which is used to step through the elements of a Collection. 2012-05-23, 2820👍, 0💬

What is new with the stop(), suspend() and resume() methods in JDK 1.2??
What is new with the stop(), suspend() and resume() methods in JDK 1.2?? The stop(), suspend() and resume() methods have been deprecated in JDK 1.2. 2012-09-18, 2819👍, 0💬

How do you write a function that can reverse a linked-list?
How do you write a function that can reverse a linked-list? void reverselist(void) { if(head==0) return; if(head-&gt;next==0) return; if(head-&gt;next==tail) { head-&gt;next = 0; tail-&gt;next = head; } else { node* pre = head; node* cur = head-&gt;next; node* curnext = cur-&... 2012-01-26, 2817👍, 0💬

What happens to objects lost in "unreachable" memory..... ?
What happens to objects lost in "unreachable" memory..... ? What happens to objects lost in "unreachable" memory, such as the object returned by Ob-&gt;new() in `{ my $ap; $ap = [ Ob-&gt;new(), \$ap ]; }' ? Their destructors are called when that interpreter thread shuts down. When the interp... 2013-09-20, 2814👍, 0💬

What’s the auto keyword good for?
What’s the auto keyword good for? Answer1 Not much. It declares an object with automatic storage duration. Which means the object will be destroyed at the end of the objects scope. All variables in functions that are not declared as static and not dynamically allocated have automatic storage duratio... 2012-03-08, 2814👍, 0💬

When a thread blocks on I/O, what state does it enter?
When a thread blocks on I/O, what state does it enter? A thread enters the waiting state when it blocks on I/O. 2012-10-10, 2813👍, 0💬

Can you declare a class as private?
Can you declare a class as private? Yes, we can declare a private class as an inner class. For example, class MyPrivate { private static class MyKey { String key = "12345"; } public static void main(String[] args) { System.out.println(new MyKey().key);//prints 12345 } } 2012-08-23, 2812👍, 0💬

What is the difference between Process and Thread?
What is the difference between Process and Thread? A process can contain multiple threads. In most multithreading operating systems, a process gets its own memory address space; a thread doesn't. Threads typically share the heap belonging to their parent process. For instance, a JVM runs in a single... 2012-06-18, 2806👍, 0💬

How to define an Abstract class?
How to define an Abstract class? A class containing abstract method is called Abstract class. An Abstract class can't be instantiated. Example of Abstract class: abstract class testAbstractClass { protected String myString; public String getMyString() { return myString; } public abstract string anyA... 2012-05-24, 2805👍, 0💬

What is a transient variable?
What is a transient variable? A transient variable is a variable that may not be serialized. 2012-09-13, 2800👍, 0💬

What is the difference between a Window and a Frame?
What is the difference between a Window and a Frame? Heavy weight components like Abstract Window Toolkit (AWT), depend on the local windowing toolkit. For example, java.awt.Button is a heavy weight component, when it is running on the Java platform for Unix platform, it maps to a real Motif button.... 2012-07-16, 2797👍, 0💬

What tool is used to manage the GAC?
What tool is used to manage the GAC? What tool is used to manage the GAC? * GacMgr.exe * GacSvr32.exe * GacUtil.exe * RegSvr.exe GacUtil.exe 2014-03-11, 2796👍, 0💬

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.NET C C++ CSS DBA General HTML Java JavaScript JSP JUnit MySQL Networking Oracle Perl Perl PHP PL/SQL RSS Software QA SQL Server Struts Unix Windows XHTML XML