JFreeChart ChartPanel加入netbeans JPanel的方法

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jPanel1.add(p,BorderLayout.CENTER);

在使用JFeechart的时候需要把chartpanel加入到jpanel，通常的问题是通过代码加入了jpanel，但是显示不出来，如下面的代码：

        TimeSeriesCollection dataset = new TimeSeriesCollection();        for (int i = 0; i < 5; i++) {            TimeSeries pop = new TimeSeries("try " + i, Day.class);            pop.add(new Day(10 + i, 1 + i, 2004 + i), 100 * (i + 2));            pop.add(new Day(10 + 1 * i, 1 + 2 + i, 2004 + i + 1), 150 * (i + 2));            pop.add(new Day(10 + 2 * i, 1 + 2 * i, 2004 + i + 2), 150 * (i + 3));            pop.add(new Day(10 + 3 * i, 1 + 2 * i, 2004 + i + 3), 150 * (i + 4));            pop.add(new Day(10 + 4 * i, 1 + 2 * i, 2004 + i + 10), 150 * (i + 5));            dataset.addSeries(pop);        }        TimeSeries pop = new TimeSeries("Try asjhaihsiuahsiuahiushaiushiauhsiuhasiua" + 100, Day.class);        int i = 5;        pop.add(new Day(1, 1 + i, 2004 + i), 100 * (i + 2));        pop.add(new Day(2, 1 + 2 + i, 2004 + i + 1), 150 * (i + 2));        pop.add(new Day(3, 1 + 2 * i, 2004 + i + 2), 150 * (i + 3));        pop.add(new Day(4, 1 + 2 * i, 2004 + i + 3), 150 * (i + 4));        pop.add(new Day(5, 1 + 2 * i, 2004 + i + 10), 1500 * (i + 5));        dataset.addSeries(pop);        JFreeChart chart = ChartFactory.createTimeSeriesChart(                "Population of CSC408 Town",                "Date",                "Population",                dataset,                true,                true,                false);        ChartPanel p = new ChartPanel(chart);        jPanel1.add(p, BorderLayout.CENTER);        jPanel1.validate();

看似正确的做法却看不到chart在jpanel里面的显示，纠正方法非常简，就是在

jPanel1.add(p, BorderLayout.CENTER);

之前加上如下的一行代码：

jPanel1.setLayout(new java.awt.BorderLayout());