明显的可以看到，三行之间间距过大，明明可以不用下边的滚动条，但是不知道怎么设置，我采用的方法是panel网格布局，三列，现在主要疑惑是设置网格布局的方法，还是设置panel的方法（好像没啥方法）或JScrollPane的方法，也试过好几个但是全都失败了。

when I create a ScrollPane without setup background,the screen result can only see the scrollpane content. so I lockup for why. I found this code in ScrollPane.java(580).It seem is the reson why the ...

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