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Java Technologies Articles
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How to set JAVA_HOME for Java in Windows?
Assuming you have installed Java in c:\Program Files\java\jdk directory −Right-click on 'My Computer' and select 'Properties'.Click the 'Environment variables' button under the 'Advanced' tab.Now, add the 'JAVA_HOME' variable and set the path to the c:\Program Files\java\jdk'.
Read MoreHow to Set Permanent Path of JDK in Windows?
Following are the required steps −Assuming you have installed Java in c:\Program Files\java\jdk directory −Right-click on 'My Computer' and select 'Properties'.Click the 'Environment variables' button under the 'Advanced' tab.Now, alter the 'Path' variable so that it also contains the path to the Java executable. Example, if the path is currently set to 'C:\WINDOWS\SYSTEM32', then change your path to read 'C:\WINDOWS\SYSTEM32;c:\Program Files\java\jdk\bin'.
Read MoreWhat happens in Java Program at compile time?
During compile time, java compiler (javac) takes the source file .java file and convert it to bytecode .class file.
Read MoreWrite an example to find whether a given string is palindrome using recursion
Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is called a recursive call of the function.Following is an example to find palindrome of a given number using recursive function.Examplepublic class PalindromeRecursion { public static boolean isPalindrome(String str){ if(str.length() == 0 ||str.length()==1){ return true; } if(str.charAt(0) == str.charAt(str.length()-1)){ return isPalindrome(str.substring(1, str.length()-1)); } return false; ...
Read MoreWhat is the Java Runtime Environment (JRE)?
JRE is Java Runtime Environment and is the machine-specific implementation of JVM. It contains libraries like rt.jar, class loaders etc which are used by JVM.
Read MoreJava Memory Model
Java memory model is divided between Thread Stacks (One for each thread) and a heap area.Thread Stack: It is a thread specific memory area and contains local variables, methods call information etc. JVM stacks could be of fixed size or variable size. If computation in a thread exceeds its stack size limit then JVM throws StackOverflowError and exits.HeapIt contains all the objects created during application lifecycle. The heap is created when the virtual machine starts up. Garbage collector reclaims heap storage for objects and objects are never explicitly deallocated. The JVM is not using any automatic storage management system, and ...
Read MoreMember variables vs Local variables in Java
Local VariableLocal variables are declared in methods, constructors, or blocks.Local variables are created when the method, constructor or block is entered and the variable will be destroyed once it exits the method, constructor, or block.Access modifiers cannot be used for local variables.Local variables are visible only within the declared method, constructor, or block.Local variables are implemented at stack level internally.There is no default value for local variables, so local variables should be declared and an initial value should be assigned before the first use.Instance/Member VariableInstance variables are declared in a class, but outside a method, constructor or any block.When a ...
Read Morebranching statement in Java
Java programming language provides following types of decision making or branching statements.Java programming language provides following types of decision making statements.Sr.No.Statement & Description1if statementAn if statement consists of a boolean expression followed by one or more statements.2if...else statementAn if statement can be followed by an optional else statement, which executes when the boolean expression is false.3nested if statementYou can use one if or else if statement inside another if or else if statement(s).4switch statementA switch statement allows a variable to be tested for equality against a list of values.
Read MoreHow can we edit a java program?
Java programs are simple text-based programs and can be edited using any text editor like notepad etc. The filename should be same as class name.
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