java - 想要在 Timer 生成事件时额外绘制线条（添加源！！）

Question

可能重复：
希望在 Timer 生成事件时额外绘制线条

public class test4 extends JFrame implements ActionListener {
static test4 test = new test4();
Vector vec = new Vector();

Timer t = new Timer(1000, this);
int timerCount = 4;
int lineCount=1;

public static void main(String[] args) {
    test.t.start(); // START THE TIMER - MAKE EVENTS EVERY 1SECONDS

    test.setSize(400,400);
    test.setVisible(true);
}

public void actionPerformed(ActionEvent e){

    int[] nums = new int[4];
    nums[0] = 0;            //X1
    nums[2] = 400;          //X2        MAKE LINE HORIZONTALLY 

    nums[3] = nums[1] = 5+test.lineCount*5;// Y1,Y2     MAKE LINE HORIZONTALLY GO DOWN
    vec.add(nums);

    timerCount--;

    //FOR TEST, LIMITED COUNTS TO 5 TIMES
    if(test.timerCount<=0)
        test.t.stop();

    test.repaint();

}

public void paint(Graphics g){
    g.setColor(Color.blue);

    for(int i = 0 ; i < vec.size() ; i++)
    {
        int[] pos = (int[])vec.get(i);
        g.drawLine(pos[0], pos[1], pos[2], pos[3]);
    }

}
}

在测试中，我检查了 drawLine 的计时器和位置。这些进展顺利

但是在 JFrame 窗口中运行此代码时我看不到任何行.. :(

我应该更正代码吗？