NotSerializableException objectIO
Im trying to write an object i made onto a file using Object output stream and whenever i run the code it thows a NotSerializableException. Please tell me if you see what i did wrong.
Save method:
public static void saveEntity(PhysicsBody b, File f) throws IOException {
if (!f.exists())
f.createNewFile();
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(f));
oos.writeObject(b);
oos.close();
}
Error output:
java.io.NotSerializableException: PhysicsBody
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at PhysicsUtil.saveEntity(PhysicsUtil.java:15)
at applet.run(applet.java:51)
at java.lang.Thread.run(Unknown Source)
PhysicsBody class:
import java.awt.geom.Point2D;
import java.util.ArrayList;
public class PhysicsBody {
protected float centerX;
protected float centerY;
protected float minX, minY, maxX, maxY;
protected float mass;
protected ArrayList<Vertex> vertices = new ArrayList<Vertex>();
protected ArrayList<Edge> edges = new ArrayList<Edge>();
public PhysicsBody(float mass) {
this.mass = mass;
}
public void addVertex(Vertex v) {
if (v != null)
vertices.add(v);
}
public void addEdge(Edge e) {
if (e != null)
edges.add(e);
}
public MinMax projectToAxis(Point2D.Float axis) {
float dotP = axis.x * vertices.get(0).x + axis.y * vertices.get(0).y;
MinMax data = new MinMax(dotP, dotP);
for (int i = 0; i < vertices.size(); i++) {
dotP = axis.x * vertices.get(i).x + axis.y * vertices.get(i).y;
data.min = Math.min(data.min, dotP);
data.max = Math.max(data.max, dotP);
}
return data;
}
public void calculateCenter() {
centerX = centerY = 0;
minX = 10000.0f;
minY = 10000.0f;
maxX = -10000.0f;
maxY = -10000.0f;
for (int i = 0; i < vertices.size(); i++) {
centerX += vertices.get(i).x;
centerY += vertices.get(i).y;
minX = Math.min(minX, vertices.get(i).x);
minY = Math.min(minY, vertices.get(i).y);
maxX = Math.max(maxX, vertices.get(i).x);
maxY = Math.m开发者_Go百科ax(maxY, vertices.get(i).y);
}
centerX /= vertices.size();
centerY /= vertices.size();
}
}
PhysicsBody
must implement java.io.Serializable
. Vertex
and Edge
should also implement it.
Does PhysicsBody implement Serializable?
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