Java Homework - Computer Science
Hello,
Exercice 1
In this exercise, we will compare 2 classes used to create stacks: ArrayStack and
NodeStack. The necessary files are in the ex1 folder. 2 files are provided to be able to compare these classes: tryStack1.java and tryStack2.java.
To do:
1. Compile and run tryStack1
2. Compile and run tryStack2
3. Based on the results obtained and the code provided, answer the following questions
:
• What can we say about the execution of tryStack1 and tryStack2?
• Describe the flow of the call to tryStack1 and tryStack2.
• What are the implementation differences between tryStack1 and tryStack2?
• What did we want to highlight?
Exercise 2: Implementing doubly linked lists
In this exercise, we will implement a class to create and manage doubly lists
chained. The necessary files are in the ex2 folder.
The code for doubly linked lists is in the DLinkedList.java file. However, 2
functions have not been implemented: InsertNode (ListNode nNode, ListNode pAfter) and
RemoveNode (ListNode nNode).
The objective of this exercise is to implement the 2 missing methods.
To do:
1. Implement the InsertNode (ListNode nNode, ListNode pAfter) method.
This method inserts the nNode node after the pAfter node in the current list.
2. Implement the RemoveNode (ListNode nNode) method.
This method removes the nNode node from the current list.
3. Compile and run the TestDLinkedList.java file to validate your implementation.
Exercise 3: Using batteries
In this exercise, we will use a stack to verify the correspondence of
opening and closing parentheses in an expression. The necessary files are in the
ex3 folder.
The code to implement is in the bracketsBalance.java file. However, 1 function does not have
been implemented: boolean bBalance (String exp).
The objective of this exercise is to implement the missing method.
Steps to follow
1. Implement the boolean bBalance (String exp) method.
• This method evaluates the expression exp for matching parentheses.
It returns true if the parentheses are well organized, false otherwise.
• Use the stack implementation in ArrayStack.java to help you.
2. Compile the bracketsBalance.java file. Test it with different expressions in order to
validate your implementation.
ex1/tryStack2.java
ex1/tryStack2.java
class
tryStack2
{
public
static
void
main
(
String
[]
args
)
{
Integer
[]
arr
=
new
Integer
[
50
];
for
(
int
i
=
0
;
i
<
50
;
i
++
)
{
arr
[
i
]
=
new
Integer
(
i
*
2
);
}
printA
(
arr
);
arr
=
reverse
(
arr
);
printA
(
arr
);
}
/* main */
public
static
Integer
[]
reverse
(
Integer
[]
a
)
{
NodeStack
S
=
new
NodeStack
();
Integer
[]
b
=
new
Integer
[
a
.
length
];
for
(
int
i
=
0
;
i
<
a
.
length
;
i
++
)
{
S
.
push
(
a
[
i
]
);
}
for
(
int
i
=
0
;
i
<
a
.
length
;
i
++
)
{
b
[
i
]
=
(
Integer
)
(
S
.
pop
()
);
}
return
b
;
}
/* reverse */
public
static
void
printA
(
Integer
[]
a
)
{
System
.
out
.
println
();
for
(
int
i
=
0
;
i
<
50
;
i
++
)
{
System
.
out
.
print
(
a
[
i
].
intValue
()
+
\t
);
}
System
.
out
.
println
();
}
/* printA */
}
ex1/tryStack1.java
ex1/tryStack1.java
class
tryStack1
{
public
static
void
main
(
String
[]
args
)
{
Integer
[]
arr
=
new
Integer
[
50
];
for
(
int
i
=
0
;
i
<
50
;
i
++
)
{
arr
[
i
]
=
new
Integer
(
i
*
2
);
}
printA
(
arr
);
arr
=
reverse
(
arr
);
printA
(
arr
);
}
/* main */
public
static
Integer
[]
reverse
(
Integer
[]
a
)
{
ArrayStack
S
=
new
ArrayStack
(
a
.
length
);
Integer
[]
b
=
new
Integer
[
a
.
length
];
for
(
int
i
=
0
;
i
<
a
.
length
;
i
++
)
{
S
.
push
(
a
[
i
]
);
}
for
(
int
i
=
0
;
i
<
a
.
length
;
i
++
)
{
b
[
i
]
=
(
Integer
)
(
S
.
pop
()
);
}
return
b
;
}
/* reverse */
public
static
void
printA
(
Integer
[]
a
)
{
System
.
out
.
println
();
for
(
int
i
=
0
;
i
<
50
;
i
++
)
{
System
.
out
.
print
(
a
[
i
].
intValue
()
+
\t
);
}
System
.
out
.
println
();
}
/* printA */
}
ex1/Stack.java
ex1/Stack.java
/**
* Interface for a stack: a collection of objects that are inserted
* and removed according to the last-in first-out principle.
*
*
@author
Roberto Tamassia
*
@author
Michael Goodrich
*
@see
EmptyStackException
*/
public
interface
Stack
{
/**
* Return the number of elements in the stack.
*
@return
number of elements in the stack.
*/
public
int
size
();
/**
* Return whether the stack is empty.
*
@return
true if the stack is empty, false otherwise.
*/
public
boolean
isEmpty
();
/**
* Inspect the element at the top of the stack.
*
@return
top element in the stack.
*
@exception
EmptyStackException if the stack is empty.
*/
public
Object
top
()
throws
EmptyStackException
;
/**
* Insert an element at the top of the stack.
*
@param
element element to be inserted.
*/
public
void
push
(
Object
element
);
/**
* Remove the top element from the stack.
*
@return
element removed.
*
@exception
EmptyStackException if the stack is empty.
*/
public
Object
pop
()
throws
EmptyStackException
;
}
ex1/NodeStack.java
ex1/NodeStack.java
/**
* Implementation of Stack interface, based on Node class (dynamic).
*/
public
class
NodeStack
implements
Stack
{
// reference to the head node
protected
Node
top
;
// number of elements in the stack
protected
int
size
;
/**
* Constructor fo NodeStack class.
*
@return
an empty stack
*/
public
NodeStack
()
{
top
=
null
;
size
=
0
;
}
public
int
size
()
{
return
size
;
}
/* size */
public
boolean
isEmpty
()
{
if
(
top
==
null
)
return
true
;
return
false
;
}
/* isEmpty */
public
Object
top
()
throws
EmptyStackException
{
if
(
isEmpty
()
)
throw
new
EmptyStackException
(
Stack is empty.
);
return
top
.
getElement
();
}
/* top */
public
void
push
(
Object
elem
)
{
// create and link-in a new node
Node
v
=
new
Node
(
elem
,
top
);
top
=
v
;
size
++
;
}
/* push */
public
Object
pop
()
throws
EmptyStackException
{
if
(
isEmpty
()
)
throw
new
EmptyStackException
(
Stack is empty.
);
Object
temp
=
top
.
getElement
();
// link-out the former top node
top
=
top
.
getNext
();
size
--
;
return
temp
;
}
/* pop */
}
ex1/Node.java
ex1/Node.java
/**
* Node used for chained data structures.
* This class is used to create a single element in such chains (simple chained).
*/
public
class
Node
{
// Element in the node.
private
Object
element
;
// Next element after this node.
private
Node
next
;
/**
* Node class constructor without parameters.
*
@return
a node with null reference to its element and next node.
*/
public
Node
()
{
this
(
null
,
null
);
}
/**
* Node class constructor given an object and next node.
*
@param
Object e element to store in the node
*
@param
Node n next node
*
@return
created node with element e and next node n
*/
public
Node
(
Object
e
,
Node
n
)
{
element
=
e
;
next
=
n
;
}
/** Getters */
public
Object
getElement
()
{
return
element
;
}
/* getElement */
public
Node
getNext
()
{
return
next
;
}
/* getNext */
/** Setters */
public
void
setElement
(
Object
newElem
)
{
element
=
newElem
;
}
/* setElement */
public
void
setNext
(
Node
newNext
)
{
next
=
newNext
;
}
/* setNext */
}
ex1/FullStackException.java
ex1/FullStackException.java
/**
* Runtime exception thrown when one tries to perform operation push
* on a full stack.
*/
public
class
FullStackException
extends
RuntimeException
{
public
FullStackException
(
String
err
)
{
super
(
err
);
}
}
ex1/EmptyStackException.java
ex1/EmptyStackException.java
/**
* Runtime exception thrown when one tries to perform operation top or
* pop on an empty stack.
*/
public
class
EmptyStackException
extends
RuntimeException
{
public
EmptyStackException
(
String
err
)
{
super
(
err
);
}
}
ex1/ArrayStack.java
ex1/ArrayStack.java
/**
* Implementation of the Stack interface using a fixed-length array.
* An exception is thrown if a push operation is attempted when the
* size of the stack is equal to the length of the array.
*
*
@author
Natasha Gelfand
*
@author
Roberto Tamassia
*
@see
FullStackException
*/
public
class
ArrayStack
implements
Stack
{
// Default length of the array used to implement the stack.
public
static
final
int
CAPACITY
=
1000
;
// Length of the array used to implement the stack.
protected
int
capacity
;
// Array used to implement the stack.
protected
Object
S
[];
// Index of the top element of the stack in the array.
protected
int
top
=
-
1
;
/**
* ArrayStack class constructor, with no parameter.
* Default length used for the array is CAPACITY.
*/
public
ArrayStack
()
{
this
(
CAPACITY
);
}
/**
* ArrayStack class constructor.
*
@param
cap length of the array.
*/
public
ArrayStack
(
int
cap
)
{
capacity
=
cap
;
S
=
new
Object
[
capacity
];
}
public
int
size
()
{
return
(
top
+
1
);
}
/* size */
public
boolean
isEmpty
()
{
return
(
top
<
0
);
}
/* isEmpty */
public
Object
top
()
throws
EmptyStackException
{
if
(
isEmpty
()
)
throw
new
EmptyStackException
(
Stack is empty.
);
return
S
[
top
];
}
/* top */
/**
* Be careful here, this implementation may throw an exception.
*
@exception
FullStackException if the array is full.
*/
public
void
push
(
Object
obj
)
throws
FullStackException
{
if
(
size
()
==
capacity
)
throw
new
FullStackException
(
Stack overflow.
);
S
[
++
top
]
=
obj
;
}
/* push */
public
Object
pop
()
throws
EmptyStackException
{
if
(
isEmpty
()
)
throw
new
EmptyStackException
(
Stack is Empty.
);
Object
elem
=
S
[
top
];
// dereference S[top] for garbage collection.
S
[
top
--
]
=
null
;
return
elem
;
}
/* pop */
}
ex2/TestDLinkedList.java
ex2/TestDLinkedList.java
/**
* Class to test doubly linked list
*
@author
Jeff Souza
*/
class
TestDLinkedList
{
public
static
void
main
(
String
[]
args
)
{
// Create a new node, with data = 1
ListNode
nNode
=
new
ListNode
();
nNode
.
data
=
1
;
// Create a new doubl- linked list with the node
DLinkedList
list
=
new
DLinkedList
();
list
.
firstNode
=
nNode
;
list
.
lastNode
=
nNode
;
// Add items to linked list (2, 3, 4, 5, 6, 7 , 8, 9 and 10)
for
(
int
i
=
2
;
i
<
11
;
i
++
)
{
nNode
=
new
ListNode
();
nNode
.
data
=
i
;
list
.
AppendNode
(
nNode
);
}
// Print the content of the list
System
.
out
.
println
();
list
.
print
();
// Remove items from linked list (2 first elements and the last one)
System
.
out
.
println
(
items removed.
);
list
.
RemoveNode
(
list
.
firstNode
);
list
.
RemoveNode
(
list
.
firstNode
);
list
.
RemoveNode
(
list
.
lastNode
);
// Print the content of the list
list
.
print
();
}
/* main */
}
ex2/ListNode.java
ex2/ListNode.java
/**
* Class node of a doubly linked list.
*
@author
Jeff Souza
*/
class
ListNode
{
// Node data
int
data
;
// Next node
ListNode
next
;
// Previous node
ListNode
previous
;
}
ex2/DLinkedList.java
ex2/DLinkedList.java
/**
* Class doubly linked list.
*
@author
Jeff Souza
*/
class
DLinkedList
{
// First node of the list.
ListNode
firstNode
;
// Last node of the list.
ListNode
lastNode
;
/**
* Appends a node to the end of the list.
*
@param
ListNode nNode Node to append.
*/
void
AppendNode
(
ListNode
nNode
)
{
InsertNode
(
nNode
,
lastNode
);
}
/* AppendNode */
/**
* Inserts a node into the list after pAfter node.
*
@param
ListNode nNode Node to insert.
*
@param
ListNode pAfter Node after which the insertion is done.
*/
void
InsertNode
(
ListNode
nNode
,
ListNode
pAfter
)
{
// INSERT YOUR CODE HERE
}
/* InsertNode */
/**
* Removes the specified node from the list.
*
@param
ListNode nNode Node to remove.
*/
void
RemoveNode
(
ListNode
nNode
)
{
// INSERT YOUR CODE HERE
}
/* RemoveNode */
/**
* Prints the content of the list.
*/
void
print
()
{
ListNode
nNode
=
null
;
System
.
out
.
print
(
Current list:
);
for
(
nNode
=
firstNode
;
nNode
!=
null
;
nNode
=
nNode
.
next
)
{
System
.
out
.
print
(
nNode
.
data
+
);
}
System
.
out
.
println
(
);
}
/* print */
}
ex3/FullStackException.java
ex3/FullStackException.java
/**
* Runtime exception thrown when one tries to perform operation push
* on a full stack.
*/
public
class
…
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In order to
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One thing you will need to do in college is learn how to find and use references. References support your ideas. College-level work must be supported by research. You are expected to do that for this paper. You will research
Elaborate on any potential confounds or ethical concerns while participating in the psychological study 20.0\% Elaboration on any potential confounds or ethical concerns while participating in the psychological study is missing. Elaboration on any potenti
3 The first thing I would do in the family’s first session is develop a genogram of the family to get an idea of all the individuals who play a major role in Linda’s life. After establishing where each member is in relation to the family
A Health in All Policies approach
Note: The requirements outlined below correspond to the grading criteria in the scoring guide. At a minimum
Chen
Read Connecting Communities and Complexity: A Case Study in Creating the Conditions for Transformational Change
Read Reflections on Cultural Humility
Read A Basic Guide to ABCD Community Organizing
Use the bolded black section and sub-section titles below to organize your paper. For each section
Losinski forwarded the article on a priority basis to Mary Scott
Losinksi wanted details on use of the ED at CGH. He asked the administrative resident