Jul 9

Synchronization in java

Synchronization is a technique to have control over threads over a shared resources. If they are not managed properly they would give wrong answer. This is race condition. Synchronization in java can be achieved using. 1. Extending Thread class. 2. Implementing Runnable interface. Types: 1. Process synchronization 2. Thread synchronization Thread Synchronization: How we achieve synchronization: 1. By Using Synchronized Method 2. By Using Synchronized Block 3. By Using Static Synchronization

2 min read

Synchronization in java

Synchronization is a technique to have control over threads over a shared resources. If they are not managed properly they would give wrong answer. This is race condition.

Synchronization in java can be achieved using.
1. Extending Thread class.
2. Implementing Runnable interface.

Types:
1. Process synchronization
2. Thread synchronization

Thread Synchronization:

How we achieve synchronization:
1. By Using Synchronized Method
2. By Using Synchronized Block
3. By Using Static Synchronization

Without synchronizing method:

Jun 25

String, StringBuffer, StringBuilder

A. String: String is immutable. Immutable means the object from which string is created that object cannot be modified or changed. If we try to modify that object the new object is created with those changes.

3 min read

Jun 18

Basics of Inheritance in java

Inheritance: Inheritance is the procedure or mechanism in which one class acquires the properties of another class. It is important part of OOP. Idea behind this is that you create new class that are built on existing class. when you inherit the existing class you can reuse the method …

3 min read

Jun 16

Varargs and ambiguity

Sometimes unexpected errors can occur while overloading methods . These errors involve ambiguity because both the methods are valid candidates for invocation. The compiler cannot make decision on which method to bind the method call.

1 min read

Varargs and ambiguity

Jun 16

Using Command Line Arguments and Variable length arguments(Varargs)

Command line argument: Sometimes you want to pass information into a program when you run it. This is achieved by passing command line arguments to main(). Command line arguments are stored as strings in a String array passed to args parameter of main(). 1. first command line argument args[0] 2. second command line…

2 min read

Using Command Line Arguments and Variable length arguments(Varargs) and

Jun 16

Nested and Inner class

Class within another class is called nested class. This results into double layered encapsulation leading to more readable and maintainable code. Nested class scope is bounded by the enclosing class. Nested class is dependent to outer class. The nested class has access to the members including private members of outer…

2 min read

Jun 16

Introducing final keyword

Field, methods, classes in java can be final. Final keyword prevents the variable, method, class from being override/Modified. When class is final => subclass of it cannot be created. When variable is final => its value cannot be changed. When method is final => it cannot be overriden. Final variable: Output: 20 Once final variable is assigned later it can’t be assigned if you try it will give error as variable i might already have been assigned

1 min read

Introducing final keyword

Field, methods, classes in java can be final.
Final keyword prevents the variable, method, class from being override/Modified.
When class is final => subclass of it cannot be created.
When variable is final => its value cannot be changed.
When method is final => it cannot be overriden.

Final variable:

Output: 20
Once final variable is assigned later it can’t be assigned if you try it will give error as variable i might already have been assigned

The same applies for methods and classes too it final method ,class are overrided or inherited it throws an error.

Jun 15

Understanding static keyword in java

There are static block, static variable and static method A. Static blocks: Block containing static keyword. This block is executed immediately when class is loaded in the memory. Even before the main method . One class can contain multiple static blocks. Can we print something on console without main method 1…

3 min read

Jun 14

Returning Objects

Till now we returned primitive data types now lets try to return objects from methods. OUTPUT: 2 20 2. while returning the object that you created in fun1() , function return type must be class name. 3. In main method first we created the object and later we printed the value…

1 min read

Jun 14

Call by value and Call by reference

Call by reference is not available in java. So we will study call by value and call by reference in other languages like c , cpp Call By Value: -Original value is not modified. -When the parameters are passed as an value in calling method then called method is invoked and…

2 min read