Some information about java

1 What was the original name of Java?

• Oak

2 What is the name of the Java mascot?

• Duke

3 What is not true about JavaBeans?

• They're fully compiled to native code.

4 Which is not an official edition?

• BE

5 Which is never true for all possible values of x?

• (x===x)

6 JavaFX is:

• A language for building browser-based content

7 OpenJDK is not:

• An open source tool for running Java in your browser or through Web Start

8 What does the letter "E" do when you create an interface with a generic specification like this:        public void interface List(){ }

• "E" is a placeholder for the type.

10 Swing is to AWT as:

• nio is to io

11 Which is not part of the Java EE 6 platform?

• JavaFX

12 The Serialization API was created as:

• A technique for converting objects to a well-defined sequence of bytes

13 Java Web Start is:

• A set of tools for starting up JAR files directly from Web pages

14 Java Hot Spot is:

• A just-in-time compiler that lets the JVM optimize byte code

15 Which platform doesn't run Java out of the box?

• PC

16 What is the difference between an int and an Integer?

• One is a primitive represented with four bytes, and the other is an object.

17 The Collection interface is used:

• To have a standard interface for different ways to store collections of objects

18 Which is not true of a Java exception?

• Exceptions can only jump over three blocks in order to make code easier to debug.

19 The Java sandbox:

• Controls which classes run with the ClassLoader object

StringBuffer example

 public class BufferDemo  
 {  
      public static void main(String args[])  
      {  
           String foo="foo";  
           String a="abc"+foo+"def"+Integer.toString(47);  
           System.out.println(a);  
           StringBuffer ab= new StringBuffer("abc");  
           ab.append(foo);  
           ab.append("def");   
           ab.append(Integer.toString(47));  
           System.out.println(ab);  
      }  
 }  

Breaking loop in java

In example, Test class has a main method and a for loop inside it and printing the looped value on console and break syntax will hault the execution of loop.

 public class test2  
 {  
      public static void main(String args[])  
      {  
           for(int x=5;x<=10;x++)  
           {  
                if(x%10==0)  
                {  
                     System.out.println(x);  
                     break;  
                     System.out.println(x);  
                }  
           }  
      }  
 }  

String Manipulation in java

In example, Test class has a main method and local string variable with few string manipulation i.e length of string, character at given position and string comparison.

 public class Test1  
 {  
      public static void main(String args[])  
      {  
           String result1="hello java";  
           int result2=result1.length()%3;  
           char result3=result1.charAt(3);  
           String result4="result1"+"result1";  
           System.out.println(result1.equals("hello java"));  
           System.out.println(result2);  
           System.out.println(result3);  
           System.out.println(result4);  
           System.out.println(result1.lastIndexOf('w'));  
      }  
 }  

For loop example in java

In example, Test class has a main method and local variable with a for loop inside it and printing the looped value on console.

 public class Test   
 {  
      public static void main(String args [])  
      {  
           int total=0;  
           int a=0;  
           int num=4321;  
           for(int x=0;x<4;x++)  
           {  
                a=num/10;  
                num=num/10;  
                System.out.println(a);  
                total +=a;  
           }  
                System.out.println(total);  
      }  
 }  

Integrating Atmosphere (WebSockets)

Click here for tutorial

Hibernate Tutorial

• Example 1
• Example 2
• Example 3

Video Tutorial from Java Brains