A: Definitions and Short Answers i. List the eight primitive data types in Java

Question

A: Definitions and Short Answers i. List the eight primitive data types in Java ii. List the non-access modifiers we have seen in class. Describe what each are used for iii. Briefly describe the entire process of writing a Java program to running in it from the command line. (Be sure to explain what javac and java are and what they do.) iv. In a Java program, why does main need to be public? v. In a Java program, the sain method is static What would be the conseqences if vi. Suppose you have a final array of numbers as an attribute. Explain why you can or vii. Give a concise definition of a method signature. What is the method signature of the vii. What is the difference between a primitive data type and a reference data type in Java? Java did not require this? (i.e, how would you run a program?) cannot change the numbers in the array main method of any program in J ix. Briefly describe the difference between a class attributeand an instance attribute. x. Briefly describe the difference between a class method and an instance method xi. In the statement System.out.println("hello, world!") explain what System out and printin each are. xii. Briefly describe the difference between the stack and the heap in our memory model xiii. Briefly describe the four sections of the memory model discussed in class: stack, heap data segment, code segment

Explanation / Answer

A)

i)

Primitive data types in java: int,float,char,short,long,double,boolean,byte

ii)

Non Access modifiers:

static: for creating class data variables and methods..

final: for finalizing the implementaions of methods,variables and classes

abstract: for creating abstract methods and classes

synchronized and volatile for threading

iii)

Java program

start with class declaration with access modifier as public

then class definition/body..contents and operations, stataments

each statement ends with ;

now...with in the body of the class ..

main method in the following format..

public static void main(String argv[])...

lets see the below example

public class Hello

{

public static void main(String argv[])

{

System.out.println("Hello");

}

};

//now first we need to compiler this

by command

javac Hello.java

now we can run it by

java Hello

iv)

public is access specifier which allows the code to be runned from outside...

since main has to be runned from outside...it need to be public

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