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[英]Gremlin get all incoming and outgoing vertex, including their edges and directions
[英]Remove all edges touching a given vertex
因此,我試圖刪除SimpleGraph(無向圖,JGraphT)的所有邊緣,但是由於某些原因,我一直在獲取ConcurrentModificationException。
這是我想做的事情:
首先,我有一個類Point如下:
class Point
{
private int x;
private int y;
public Point(int x, int y)
{
this.x = x;
this.y = y;
}
//getters and setters
public boolean equals (Object rhs)
{
if (rhs == null || !(rhs instanceof Point))
return false;
else
{
Point rhsPoint = (Point) rhs;
return rhsPoint.x == this.x && rhsPoint.y == this.y;
}
}
public int hashCode()
{
int hash = 3;
hash = 83 * hash + (int) (this.col ^ (this.col >>> 32));
hash = 83 * hash + (int) (this.row ^ (this.row >>> 32));
return hash;
}
}
圖g的頂點是Point的實例,並存儲在2D數組中
Point[][] pointContainer = new Point[100][100];
SimpleGraph<Point, DefaultEdge.class> g = new SimpleGraph<Point, DefaultEdge.class>();
public void initGraph()
{
for (int row = 0; row < 100; ++row)
for (int col = 0; col < 100; ++col)
{
Point p = new Point(col, row);
pointContainer[row][col] = p;
g.addVertex(p);
}
//Then I added edges between any adjacent vertices
//so except for those vertices near the edges of the grid, each vertex has 8 edges
}
public void removeEdges(int row, int col)
{
Set edges = g.edgesOf(pointContainer[row][col]);
g.removeAllEdges(edges);
}
誰能告訴我我在這里做錯了什么? 為什么我不斷收到ConCurrentModificationException?
ConCurrentModificationException
表示您正在嘗試修改項目,為什么不允許這樣做,即在迭代時嘗試修改Collection時發生
嘗試檢查堆棧跟蹤以幫助您檢測錯誤,很有可能發生在未附加的代碼中。 我認為您在調用removeEdges()
可能會導致一些問題
第二件事,在您的Point.equal()
方法中,您能否解釋一下為什么將點投射到單元格?
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