This code makes a Concept Map with the Processing library / Java. Processing library makes it easy and quick to make graphical representations and animations, among its many features.

    /**
     * setup is called implicitly by the library when rdraw is called
     * it sets the size, drawing method, then in this case draws the graph
     */
    public void setup() {
      size(boxSize,boxSize);
      smooth();
      drawGraph();
     }
    /**
     * Draws the graph. req and neighbors must have been
     * previously set through the construtor or the setters
     */
    public void drawGraph()
    {     
        int halfBox= 150;
        //processing uses radians, not degrees
        float angle = 2*PI / neighbors.size();
        for(int i = 0; i < neighbors.size(); i++)
        {
            float cur_angle = i*angle;
            String s = neighbors.get(i);
   
            //calculate an even dispersal around the central objet
            //it depends on how many objects are in your list
            float xpos = halfBox*cos(cur_angle)+center;
            float ypos = halfBox*sin(cur_angle)+center;
       
            //color=black, draw a line to new item
            stroke(0);
            line(center,center, xpos,ypos);
            //put the item last, on top of the lines
            drawCircle(xpos, ypos, s);
        }
        //put the item last, on top of the lines
        drawCircle(center,center,result);
    }

    /**
     * draws a circle with specified text at (x,y)
     * @param x the x position of where the circle will go
     * @param y the y position of where the circle will go
     * @param word the word that will go in the middle of the circle
     */
    public void drawCircle(float x, float y, String word)
    {
        fill(255);
        ellipse(x,y,word.length()*10, 40);
        fill(0, 102, 153);
        textAlign(CENTER);
        text(word,x,y);
    }

/**
     * Makes a graph with req in the middle, surrounded
     * by neighbors n. calls the library's super, Papplet.main
     */
    public void rdraw(String req, ArrayList<String> n)
    {
        result = req;
        neighbors = n;
     
        PApplet.main(new String[] { "--bgcolor=#ECE9D8", "BrainH.client.ConceptMap" });
    }

Compete Source here [ConceptMap.java].