Category Archives: Core Java

How to find your Google Plus ID

By | September 27, 2012

This is so simple 1. Go to your Google + account ( 2. Click on the Profile icon on the Left. 3. If you look at the URL in the address bar, it should look something like this: 4. The long numerical string in the URL is your Google+ ID. Here is CoderzHeaven’s from the URL above:… Read More »

Java check memory Allocation

By | April 7, 2012

When run the code the output will be similar to this Total memory is: 5177344 Initial free memory: 4986744 Free memory after garbage collection: 5063784 Free memory after allocation: 5045296 Memory used by allocation: 18488 Free memory after collecting discarded Integers: 5063784

Creating Exceptions in JAVA

By | February 25, 2011

This is a simple custom exception in java. That is, we can create an exception by extending the exception class. The “throw new MyExcep” will throw an exception and the error message we specified will be displayed import java.lang.Exception; @SuppressWarnings(“serial”) class MyExcep extends Exception { MyExcep(String Errormsg) { super(Errormsg); // call Exception class error message } } public… Read More »

Abstract Class in java

By | February 20, 2011

This example shows how a simple java abstract class works Here “Shape” is the abstract class abstract class Shape { abstract void initial(); // methods only defined….. abstract void display(); } class cube extends Shape { void initial() // Abstract Methods defined…. { System.out.println(“Hello !! “); } void display() { System.out.println(“How are you?”); } } public class Abstract… Read More »

Java Exception

By | February 19, 2011

Simple java program to show how exception works public class exception { public static void main(String[] args) { try { int a = 10; int b = 10/0; } catch(ArithmeticException e) { System.out.println(“Exception Caught ” + e); } } } The output will be like you expect Exception Caught java.lang.ArithmeticException: / by zero