Please answer me accordingly to the instruction, I cannot post questions separately because 4 questions require each other reference.

CD107 - Java 2 Assignment. In a group not more than five students, you have to do the following: (a) Design a system that consist of a few classes. The class diagram should implement the concept of Encapsulation, Inheritance and Polymorphism. (30 Marks) (b) Based on the class diagram you have to write a java program and a test program. (30 Marks) (c) Create interfaces for your system and connect to a database. (20 Marks) (d) Write a report and present your system to the class. Everyone in the group will be asked to modify the code and produce some results. (20 Marks) *The number of classes in your system should be more than the number of the group members. 2nd page- Introduction Write a name of your system. The objectives, the benefits, the users. 3rd page - Class diagram - name, attributes, methods - association subclass/superclass) -show private/public/default - write an explanation to your class diagram. One paragraph or more. -Explain the concept of Encapsulation, Inheritance and Polymorphism (method overloading and method overriding) in your class diagram. next page - wirte the code with comments. Next page - The interfaces - you printscreen the interfaces with explanations. One or two sentences for each interfaces. Next page - Database - print screen the table name, field name and data type., some explanations at least one or two sentences for each table. CD107 - Java 2 Assignment. In a group not more than five students, you have to do the following: (a) Design a system that consist of a few classes. The class diagram should implement the concept of Encapsulation, Inheritance and Polymorphism. (30 Marks) (b) Based on the class diagram you have to write a java program and a test program. (30 Marks) (c) Create interfaces for your system and connect to a database. (20 Marks) (d) Write a report and present your system to the class. Everyone in the group will be asked to modify the code and produce some results. (20 Marks) *The number of classes in your system should be more than the number of the group members. 2nd page- Introduction Write a name of your system. The objectives, the benefits, the users. 3rd page - Class diagram - name, attributes, methods - association subclass/superclass) -show private/public/default - write an explanation to your class diagram. One paragraph or more. -Explain the concept of Encapsulation, Inheritance and Polymorphism (method overloading and method overriding) in your class diagram. next page - wirte the code with comments. Next page - The interfaces - you printscreen the interfaces with explanations. One or two sentences for each interfaces. Next page - Database - print screen the table name, field name and data type., some explanations at least one or two sentences for each table