This is a java program to represent graph as a adjacency matrix. Nodes are arranged in matrix and at an index of i, j zero is displayed if nodes i and j are not connected, one otherwise.

Here is the source code of the Java Program to Represent Graph Using Adjacency Matrix. The Java program is successfully compiled and run on a Windows system. The program output is also shown below.

`//This is a java program to represent graph as a adjacency matrix`

import java.util.Scanner;

public class Represent_Graph_Adjacency_Matrix

`{`

private final int vertices;

private int[][] adjacency_matrix;

public Represent_Graph_Adjacency_Matrix(int v)

`{`

vertices = v;

adjacency_matrix = new int[vertices + 1][vertices + 1];

`}`

public void makeEdge(int to, int from, int edge)

`{`

`try`

`{`

adjacency_matrix[to][from] = edge;

`}`

catch (ArrayIndexOutOfBoundsException index)

`{`

System.out.println("The vertices does not exists");

`}`

`}`

public int getEdge(int to, int from)

`{`

`try`

`{`

return adjacency_matrix[to][from];

`}`

catch (ArrayIndexOutOfBoundsException index)

`{`

System.out.println("The vertices does not exists");

`}`

return -1;

`}`

public static void main(String args[])

`{`

int v, e, count = 1, to = 0, from = 0;

Scanner sc = new Scanner(System.in);

`Represent_Graph_Adjacency_Matrix graph;`

`try`

`{`

System.out.println("Enter the number of vertices: ");

v = sc.nextInt();

System.out.println("Enter the number of edges: ");

e = sc.nextInt();

graph = new Represent_Graph_Adjacency_Matrix(v);

System.out.println("Enter the edges: <to> <from>");

while (count <= e)

`{`

to = sc.nextInt();

from = sc.nextInt();

graph.makeEdge(to, from, 1);

`count++;`

`}`

System.out.println("The adjacency matrix for the given graph is: ");

System.out.print(" ");

for (int i = 1; i <= v; i++)

System.out.print(i + " ");

System.out.println();

for (int i = 1; i <= v; i++)

`{`

System.out.print(i + " ");

for (int j = 1; j <= v; j++)

System.out.print(graph.getEdge(i, j) + " ");

System.out.println();

`}`

`}`

catch (Exception E)

`{`

System.out.println("Somthing went wrong");

`}`

sc.close();

`}`

`}`

Output:

$ javac Represent_Graph_Adjacency_Matrix.java $ java Represent_Graph_Adjacency_Matrix Enter the number of vertices: 5 Enter the number of edges: 7 Enter the edges: <to> <from> 1 1 2 3 3 4 4 5 3 5 1 4 2 4 The adjacency matrix for the given graph is: 1 2 3 4 5 1 1 0 0 1 0 2 0 0 1 1 0 3 0 0 0 1 1 4 0 0 0 0 1 5 0 0 0 0 0

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