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How do you print every Nth character in Java?

Give an implementation of the size() method for the singularly linked list class, assuming that we did not maintain size as an instance variable

Create class Course as per its UML diagram. Then, create subclasses Faculty and Student that extend class Person from the Chapter 9 Assignment (just copy-paste it from our Chapter 9 assignment). Refer to the UML diagrams to give these classes attributes and methods. Do NOT add any attributes or methods that don't appear in the UML diagrams. Create an executable class named TestCollege to test your work. In TestCollege, add code that accomplishes the tasks below. The sample output might assist you to understand these tasks.

In java i know who to get letters from a string. String first = firstName.substring(0,3); This will her first three letters. But how do i get letters starting from 2nd letter to end assuming there is a 2nd letter and onward. Some thing like this String first = firstName.substring(2,end); but the end should be replaced with what?? Thanks

Write a Java program that prompts the user to enter a security code that matches a specific pattern. Your program must approve the user's entry.. Here is the pattern:
A lower case character, an upper case character, a lower case character, an upper case character, 3 or 4 digits, 1 or 2 lower case letters, 2 upper case characters, 1 digit.

Class Person has instance data members (all private) String fullName, char gender, int age. has a public static int variable named numFriends with an initial value of zero. has a constructor that will be used to make a Person object and assign values to its data members, and increment numFriends. has getters and setters for all three instance data members. has a toString() method that returns a string displaying the state of a Person instance.

Write a java method that repeatedly selects and removes a random entry from an array until the array holds no more entries.

I have a JFrame class TaskPane which contains jPanel2 and addButton. And jPanel2 in its turn contain taskPaneContainer. When we click addButton it adds dynamic Menu to jPanel2, for example Menu 1, Menu 2,... Every Menu consist Item and Delete Button, for example, Menu 1->Item1,Delete; Menu 2->Item2,Delete etc. I would like to ask when I added 3 Menu, i.e. Menu 1 [Item1], Menu 2 [Item2], Menu 3 [Item3], how can I get all actionCommand of Item Button, i.e. 1, 2, 3?

1.what is java..??
2.difference between database and database management.??

Write a method named sumInts that can take a variable number of int arguments and return the sum of these arguments. The ints to be summed up must be entered as command line arguments. Command line arguments can be simulated in Eclipse. Watch the video. In the main method, display the ints that were entered on the command line. Then execute sumInts and display the sum it returns.