JFrame部分透明

Question

Im working on analyse differences between shortest and simpliest way in a graph. To make it easier, I created a very simple JFrame for visualizing the graph and the way. As you can see on the pictue, the background seems to be partly transparent. I dont know the reason.

http://postimg.org/image/p1axfhj9h/ (Sory but i am not allowed to upload pictues, yet)

Is there a problem with the painting method? This problem occurs only on my private laptop. Im using java 1.7.0_45

I have noch changes made on background color or transparency. The paint method is only painting strings, ovals and lines.

public Drucker(Graph graph) {
    super();
    this.graph = graph;
    setDefaultCloseOperation(EXIT_ON_CLOSE);
}


@Override
public void paint(Graphics g) {

    for (int i = 0; i < this.graph.getKanten().size(); i++) {
        xxx
    }

    for (int i = 0; i < this.graph.getKnoten().size(); i++) {
        xxx
    }       

    this.paintDistance(g);
}

Is there a problem with my java vesion? I home somebody can help me.

Thanks and regards

Answer 1

I think you need to super construct your paint() method.

This simply means writing this:

@Override
public void paint(Graphics g) {
    super.paint(g);

    // your code goes here
}

When you super construct the method, that basically means you will paint the parent object then paint the String.

This is just a hunch. Let me know if this does, in fact, fix your problem.