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38 lines
794 B
38 lines
794 B
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public class UndirectedGraph extends Graph {
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public UndirectedGraph() {
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super();
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}
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@Override
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public boolean addEdge(Node node1, Node node2) {
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addNode(node1); // only adds if node not already in graph.
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addNode(node2);
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boolean addEdgeSuccess = (
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addEdgeFromTo(node1, node2)
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&& addEdgeFromTo(node2, node1));
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if (addEdgeSuccess) {
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numEdges++;
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}
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return addEdgeSuccess;
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}
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@Override
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public boolean removeEdge(Node node1, Node node2) {
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if (!containsNode(node1) || !containsNode(node2)) {
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return false;
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}
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boolean removeEdgeSuccess = (
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removeEdgeFromTo(node1, node2)
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&& removeEdgeFromTo(node2, node1));
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if (removeEdgeSuccess) {
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numEdges--;
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}
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return removeEdgeSuccess;
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}
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}
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