Contents
How to implement the graph data structure in Java?
To understand this example, you should have the knowledge of the following Java programming topics: In the above example, we have implemented the graph data structure in Java. To learn more about graphs, visit Graph Data Structure. Did you find this article helpful? Sorry about that.
How to implement a weighted graph in Java?
I implemented a weighted directed graph as a HashSet of vertices. We can implement an undirected and/or unweighted graph using the same approach (refer to the comments in the code). Each vertex has a name and contains a list of all of its outgoing edges.
How is a graph represented in Java collections?
As we discussed earlier, a graph is nothing but a collection of vertices and edges which can be represented as either an adjacency matrix or an adjacency list. Let’s see how we can define this using an adjacency list here: As we can see here, the class Graph is using Map from Java Collections to define the adjacency list.
When do you need an abstract class in Java?
Abstract class having constructor, data member and methods Rule: If there is an abstract method in a class, that class must be abstract. Rule: If you are extending an abstract class that has an abstract method, you must either provide the implementation of the method or make this class abstract.
What’s the edge of a graph in Java?
The graph has an edge between 3 and 4. The graph does not contain 5 as a vertex. Attention reader! Don’t stop learning now. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready.
Which is the graph travesring algorithm in Java?
It visits all the nodes recursively. There are two algorithms for travesring a graph – Depth First Search (DFS) and Breadth First Search (BFS). DFS algorithm works in a manner similar to preorder traversal of the trees where we visit the root of the subtree and then the child nodes of the root.
How many vertices does a graph have in Java?
Graph: 0: 1 4 1: 0 2 3 4 2: 1 3 3: 1 2 4 4: 0 1 3 The graph has 5 vertex The graph has 7 edges. The graph has an edge between 3 and 4. The graph does not contain 5 as a vertex.
When to use a map in a graph?
We will use two maps. The first map for storing the vertices and edges. Second map for storing the index for each vertex. the second map will be used in traversing the graph to avoid going in loops. (used by the visited array in case of DFS or BFS ).
How are vertices stored in a graph in Java?
In the first stage all vertices at level 1 meaning vertices whose distance is 1 from start vertex of the graph. In the second stage, it visits all vertices at the second level. BFS continues this process until all the levels of the graph are completed. Here, the queue data structure is used for storing the vertices of a level.