拓扑排序的实现java_java实现-拓扑排序
import java.util.Stack;
//拓扑排序
public class GraphTopologic {
private int numVertexes;
private VertexNode[] adjList;//邻接顶点的一维数组
public GraphTopologic(int numVertexes){
this.numVertexes = numVertexes;
}
//拓扑排序
public void topologicSort(){
Stack stack = new Stack<>();
int count = 0;
int k = 0;
for(int i = 0;i < numVertexes;i++){
if(adjList[i].in == 0){
stack.push(i);
}
}
while(!stack.isEmpty()){
int pop = stack.pop();
System.out.println("顶点:" + adjList[pop].data);
count++;
for(EdgeNode node = adjList[pop].firstEdge;node != null;node = node.next){
k = node.adjvex;//下标
if(--adjList[k].in == 0){
stack.push(k); //入度为0 入栈
}
}
}
}
private void createGraph(){
VertexNode node0 = new VertexNode(0,"v0");
VertexNode node1 = new VertexNode(0,"v1");
VertexNode node2 = new VertexNode(2,"v2");
VertexNode node3 = new VertexNode(0,"v3");
VertexNode node4 = new VertexNode(2,"v4");
VertexNode node5 = new VertexNode(3,"v5");
VertexNode node6 = new VertexNode(1,"v6");
VertexNode node7 = new VertexNode(2,"v7");
VertexNode node8 = new VertexNode(2,"v8");
VertexNode node9 = new VertexNode(1,"v9");
VertexNode node10 = new VertexNode(1,"v10");
VertexNode node11 = new VertexNode(2,"v11");
VertexNode node12 = new VertexNode(1,"v12");
VertexNode node13 = new VertexNode(2,"v13");
adjList = new VertexNode[numVertexes];
adjList[0] =node0;
adjList[1] =node1;
adjList[2] =node2;
adjList[3] =node3;
adjList[4] =node4;
adjList[5] =node5;
adjList[6] =node6;
adjList[7] =node7;
adjList[8] =node8;
adjList[9] =node9;
adjList[10] =node10;
adjList[11] =node11;
adjList[12] =node12;
adjList[13] =node13;
node0.firstEdge = new EdgeNode(11);node0.firstEdge.next = new EdgeNode(5);node0.firstEdge.next.next = new EdgeNode(4);
node1.firstEdge = new EdgeNode(8);node1.firstEdge.next = new EdgeNode(4);node1.firstEdge.next.next = new EdgeNode(2);
node2.firstEdge = new EdgeNode(9);node2.firstEdge.next = new EdgeNode(6);node2.firstEdge.next.next = new EdgeNode(5);
node3.firstEdge = new EdgeNode(13);node3.firstEdge.next = new EdgeNode(2);
node4.firstEdge = new EdgeNode(7);
node5.firstEdge = new EdgeNode(12);node5.firstEdge.next = new EdgeNode(8);
node6.firstEdge = new EdgeNode(5);
node8.firstEdge = new EdgeNode(7);
node9.firstEdge = new EdgeNode(11);node9.firstEdge.next = new EdgeNode(10);
node10.firstEdge = new EdgeNode(13);
node12.firstEdge = new EdgeNode(9);
}
//边表结点
class EdgeNode{
private int adjvex;
private EdgeNode next;
private int weight;
public EdgeNode(int adjvex){
this.adjvex = adjvex;
}
public int getAdjvex() {
return adjvex;
}
public void setAdjvex(int adjvex) {
this.adjvex = adjvex;
}
public EdgeNode getNext() {
return next;
}
public void setNext(EdgeNode next) {
this.next = next;
}
}
//邻接顶点
class VertexNode{
private int in;//入度
private String data;
private EdgeNode firstEdge;
public VertexNode(int in,String data){
this.in = in;
this.data = data;
}
public int getIn() {
return in;
}
public void setIn(int in) {
this.in = in;
}
public String getData() {
return data;
}
public void setData(String data) {
this.data = data;
}
public EdgeNode getFirstEdge() {
return firstEdge;
}
public void setFirstEdge(EdgeNode firstEdge) {
this.firstEdge = firstEdge;
}
}
}