How to set java heap size in Eclipse?

You have 2 options:
1. Edit eclipse-home/eclipse.ini to be something like the following and restart Eclipse.

-vmargs
-Xms64m
-Xmx256m

2. Or, you can just run eclipse command with additional options at the very end. Anything after -vmargs will be treated as JVM options and passed directly to the JVM. JVM options specified in the command line this way will always override those in eclipse.ini. For example,

eclipse -vmargs -Xms64m -Xmx256m

Installing Apache Tomcat Server in Eclipse IDE

1. If you do not have Apache Tomcat on your machine, you will first need to download and unzip Apache Tomcat (this scenario was written using Apache Tomcat version 5.0.28, but other versions can be substituted).
2. Start the Eclipse WTP workbench.
3. Open Window -> Preferences -> Server -> Installed Runtimes to create a Tomcat installed runtime.
4. Click on Add... to open the New Server Runtime dialog, then select your runtime under Apache (Apache Tomcat v5.0 in this example):

5. Click Next , and fill in your Tomcat installation directory :

6. Ensure the selected JRE is a full JDK and is of a version that will satisfy Apache Tomcat (this scenario was written using SUN JDK 1.4.2_06). If necessary, you can click on Installed JREs... to add JDKs to Eclipse.
7. Click Finish .

Java Packages,Java Package's Interview Questions ,core java IT technical interview questions

Java interfaces and classes are grouped into packages. The following are the java packages, from which you can access interfaces and classes, and then fields, constructors, and methods.


java.lang
Package that contains essential Java classes, including numerics, strings, objects, compiler, runtime, security, and threads. This is the only package that is automatically imported into every Java program.
java.io
Package that provides classes to manage input and output streams to read data from and write data to files, strings, and other sources.
java.util
Package that contains miscellaneous utility classes, including generic data structures, bit sets, time, date, string manipulation, random number generation, system properties, notification, and enumeration of data structures.
java.net
Package that provides classes for network support, including URLs, TCP sockets, UDP sockets, IP addresses, and a binary-to-text converter.
java.awt
Package that provides an integrated set of classes to manage user interface components such as windows, dialog boxes, buttons, checkboxes, lists, menus, scrollbars, and text fields. (AWT = Abstract Window Toolkit)
java.awt.image
Package that provides classes for managing image data, including color models, cropping, color filtering, setting pixel values, and grabbing snapshots.
java.awt.peer
Package that connects AWT components to their platform-specific implementations (such as Motif widgets or Microsoft Windows controls).
java.applet
Package that enables the creation of applets through the Applet class. It also provides several interfaces that connect an applet to its document and to resources for playing audio.