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Java 6

A comprehensive guide to all Java 6 concepts with practical examples for interview preparation.

Table of Contents

  1. Scripting Support (JSR 223)
  2. Improved Web Services Support
  3. Compiler API
  4. Pluggable Annotations Processing API
  5. JDBC 4.0 Enhancements
  6. Common Interview Questions

1. Scripting Support (JSR 223)

Java 6 introduced scripting support, allowing Java applications to execute scripts in various languages.

Overview

The Scripting API enables Java applications to integrate with scripting languages like JavaScript, Python, Ruby, etc.

Basic Usage

import javax.script.*;

ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("JavaScript");

// Execute script
engine.eval("print('Hello from JavaScript');");

// Evaluate expression
Object result = engine.eval("2 + 3");
System.out.println("Result: " + result);

Key Features

  • Multiple scripting languages
  • Script execution
  • Variable binding
  • Function invocation
  • Script compilation

See ScriptingExample.java for complete example.

2. Improved Web Services Support

Java 6 enhanced support for web services with JAX-WS.

Overview

JAX-WS (Java API for XML Web Services) provides better support for SOAP and REST web services.

Key Features

  • SOAP web services
  • REST support
  • WSDL generation
  • Client generation
  • Better tooling

Note: This is primarily for enterprise web services development.

3. Compiler API

The Compiler API allows programmatic compilation of Java source code.

Overview

The Compiler API enables tools and frameworks to compile Java code programmatically.

Basic Usage

import javax.tools.*;

JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null);

Iterable<? extends JavaFileObject> compilationUnits = 
    fileManager.getJavaFileObjectsFromStrings(Arrays.asList("MyClass.java"));

compiler.getTask(null, fileManager, null, null, null, compilationUnits).call();

Key Features

  • Programmatic compilation
  • Tool integration
  • IDE support
  • Build tool support

See CompilerAPIExample.java for complete example.

4. Pluggable Annotations Processing API

The Pluggable Annotations Processing API allows custom annotation processors.

Overview

Annotation processors can process annotations at compile time to generate code or perform validation.

Key Features

  • Compile-time annotation processing
  • Code generation
  • Validation
  • Tool integration

Note: This is an advanced feature primarily for tool developers.

5. JDBC 4.0 Enhancements

JDBC 4.0 introduced several improvements for database connectivity.

Overview

JDBC 4.0 enhancements include automatic driver loading, better exception handling, and new data types.

Key Features

  • Automatic driver loading
  • Better exception handling
  • SQLXML support
  • RowId support
  • National Character Set support

See JDBC4Example.java for complete example.

6. Common Interview Questions

Q1: What is Scripting Support in Java 6?

A: JSR 223 Scripting API:

  • Execute scripts in various languages
  • JavaScript, Python, Ruby support
  • Variable binding
  • Function invocation

Q2: What is the Compiler API?

A: Programmatic Java compilation:

  • Compile code programmatically
  • Tool integration
  • IDE support
  • Build tool support

Q3: What are JDBC 4.0 Enhancements?

A: Improved database connectivity:

  • Automatic driver loading
  • Better exception handling
  • SQLXML support
  • RowId support

Q4: What is Pluggable Annotations Processing?

A: Compile-time annotation processing:

  • Custom annotation processors
  • Code generation
  • Validation
  • Tool integration

Last Updated: 2025
Version: 1.0

This guide covers the features of Java 6, released on December 11, 2006.