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Java/DataStructures/Graphs/MatrixGraphs.java at master · nishants/Java · GitHub
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DataStructures
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Graphs
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MatrixGraphs.java
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DataStructures
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Graphs
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MatrixGraphs.java
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package
DataStructures
.
Graphs
;
public
class
MatrixGraphs
{
public
static
void
main
(
String
args
[]) {
AdjacencyMatrixGraph
graph
=
new
AdjacencyMatrixGraph
(
10
);
graph
.
addEdge
(
1
,
2
);
graph
.
addEdge
(
1
,
5
);
graph
.
addEdge
(
2
,
5
);
graph
.
addEdge
(
1
,
2
);
graph
.
addEdge
(
2
,
3
);
graph
.
addEdge
(
3
,
4
);
graph
.
addEdge
(
4
,
1
);
graph
.
addEdge
(
2
,
3
);
System
.
out
.
println
(
graph
);
}
}
class
AdjacencyMatrixGraph
{
private
int
_numberOfVertices
;
private
int
_numberOfEdges
;
private
int
[][]
_adjacency
;
static
final
int
EDGE_EXIST
=
1
;
static
final
int
EDGE_NONE
=
0
;
public
AdjacencyMatrixGraph
(
int
givenNumberOfVertices
) {
this
.
setNumberOfVertices
(
givenNumberOfVertices
);
this
.
setNumberOfEdges
(
0
);
this
.
setAdjacency
(
new
int
[
givenNumberOfVertices
][
givenNumberOfVertices
]);
for
(
int
i
=
0
;
i
<
givenNumberOfVertices
;
i
++) {
for
(
int
j
=
0
;
j
<
givenNumberOfVertices
;
j
++) {
this
.
adjacency
()[
i
][
j
] =
AdjacencyMatrixGraph
.
EDGE_NONE
;
}
}
}
private
void
setNumberOfVertices
(
int
newNumberOfVertices
) {
this
.
_numberOfVertices
=
newNumberOfVertices
;
}
public
int
numberOfVertices
() {
return
this
.
_numberOfVertices
;
}
private
void
setNumberOfEdges
(
int
newNumberOfEdges
) {
this
.
_numberOfEdges
=
newNumberOfEdges
;
}
public
int
numberOfEdges
() {
return
this
.
_numberOfEdges
;
}
private
void
setAdjacency
(
int
[][]
newAdjacency
) {
this
.
_adjacency
=
newAdjacency
;
}
private
int
[][]
adjacency
() {
return
this
.
_adjacency
;
}
private
boolean
adjacencyOfEdgeDoesExist
(
int
from
,
int
to
) {
return
(
this
.
adjacency
()[
from
][
to
] !=
AdjacencyMatrixGraph
.
EDGE_NONE
);
}
public
boolean
vertexDoesExist
(
int
aVertex
) {
if
(
aVertex
>=
0
&&
aVertex
<
this
.
numberOfVertices
()) {
return
true
;
}
else
{
return
false
;
}
}
public
boolean
edgeDoesExist
(
int
from
,
int
to
) {
if
(
this
.
vertexDoesExist
(
from
) &&
this
.
vertexDoesExist
(
to
)) {
return
(
this
.
adjacencyOfEdgeDoesExist
(
from
,
to
));
}
return
false
;
}
/**
* This method adds an edge to the graph between two specified
* vertices
*
* @param from the data of the vertex the edge is from
* @param to the data of the vertex the edge is going to
* @return returns true if the edge did not exist, return false if it already did
*/
public
boolean
addEdge
(
int
from
,
int
to
) {
if
(
this
.
vertexDoesExist
(
from
) &&
this
.
vertexDoesExist
(
to
)) {
if
(!
this
.
adjacencyOfEdgeDoesExist
(
from
,
to
)) {
this
.
adjacency
()[
from
][
to
] =
AdjacencyMatrixGraph
.
EDGE_EXIST
;
this
.
adjacency
()[
to
][
from
] =
AdjacencyMatrixGraph
.
EDGE_EXIST
;
this
.
setNumberOfEdges
(
this
.
numberOfEdges
() +
1
);
return
true
;
}
}
return
false
;
}
/**
* this method removes an edge from the graph between two specified
* vertices
*
* @param from the data of the vertex the edge is from
* @param to the data of the vertex the edge is going to
* @return returns false if the edge doesn't exist, returns true if the edge exists and is removed
*/
public
boolean
removeEdge
(
int
from
,
int
to
) {
if
(!
this
.
vertexDoesExist
(
from
) || !
this
.
vertexDoesExist
(
to
)) {
if
(
this
.
adjacencyOfEdgeDoesExist
(
from
,
to
)) {
this
.
adjacency
()[
from
][
to
] =
AdjacencyMatrixGraph
.
EDGE_NONE
;
this
.
adjacency
()[
to
][
from
] =
AdjacencyMatrixGraph
.
EDGE_NONE
;
this
.
setNumberOfEdges
(
this
.
numberOfEdges
() -
1
);
return
true
;
}
}
return
false
;
}
/**
* this gives a list of vertices in the graph and their adjacencies
*
* @return returns a string describing this graph
*/
public
String
toString
() {
String
s
=
new
String
();
s
=
" "
;
for
(
int
i
=
0
;
i
<
this
.
numberOfVertices
();
i
++) {
s
=
s
+
String
.
valueOf
(
i
) +
" "
;
}
s
=
s
+
"
\n
"
;
for
(
int
i
=
0
;
i
<
this
.
numberOfVertices
();
i
++) {
s
=
s
+
String
.
valueOf
(
i
) +
" : "
;
for
(
int
j
=
0
;
j
<
this
.
numberOfVertices
();
j
++) {
s
=
s
+
String
.
valueOf
(
this
.
_adjacency
[
i
][
j
]) +
" "
;
}
s
=
s
+
"
\n
"
;
}
return
s
;
}
}
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