This work analysis of both technologies and its conclusion extract from theoretical background, key similarities and differences, practical aspects, typical usage and implementation of projects. The main purpose of this book is to develop cash and bank financial project in both the technologies with same functional requirements and compare the technical features in practical and theoretical aspects. .NET platform used Visual Studio development environment and Java EE platform used NetBeans IDE, eclipse and IntelliJ development environment. There is no doubt that eclipse development environment have excellent support of handling different types of plugin and their customization but author choose NetBeans because project requires different kinds of forms that NetBeans IDE support better than eclipse. Also NetBeans IDE is more intuitive and integrated than eclipse Rich Client Platform (RCP). The primary goal is to compare .NET and Java EE platform features but both platform used development environment to develop the application so author compare the development environment/ platform features based on theoretical and practical experiments.