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Describe StringBuffer class in java. List all the functions relevant to it and explain any five of them.

Explain all the steps of running the beanbox.

Implement the class diagrams in Java. Print out what tasks does an object in the doWork() method. For example, a student object will do “studying”. Each display() method should print all the object’s data fields and its parent’s data fields. Each getInput() method should get all the inputs from keyboard and assign them to the object’s fields and its parent’s fields. Write a main function to test your classes.

What project in java can be made which is in demand today?

Write a java program that takes in integers from the user into an array named
numbers with size entered by the user :
The program generates an array index randomly: (use random()
method) If the cell of that index has positive value change it to
negative value,
If the cell has negative value change it to positive.
The program prints the array before and after the change.
The program prints all index values not generated randomly
Notes:
Decided that the number of randomly generated indexes is about half the
size of the array. (If the array size is 100 then generate 50 random numbers
for indexes)
It is important to note that: If the index number generated more than
once, the user will hear an announcement and generate one more index
More: (How will we know if the index number already generated ??? )

I have a layout with some text-views. This layout comes up from down with new values when we click on some text-views. We can see that layout is coming but ow I want to see that a layout is going up and another is coming. Can anyone help me in it please?

I want to use timer task in my project. I want to show remaining time in a text view like "Left : 00:59". I want to pause it too when we press back button or home button and start them again when we come back on that activity. Can anyone please give me a simple code regarding of it?

Give an example of a program fragment that contains an explicit heap-dynamic variable. Clearly indicate which variable in the program is explicit heap-dynamic.