pack
public void pack()
Causes this Window to be sized to fit the preferred size and layouts of its subcomponents. If the window and/or its owner are not yet displayable, both are made displayable before calculating the preferred size. The Window will be validated after the preferredSize is calculated. 这是在java文档上找到的答案，如果不去找文档象这样你不认识的函数会很多。
public void pack()
Causes this Window to be sized to fit the preferred size and layouts of its subcomponents. If the window and/or its owner are not yet displayable, both are made displayable before calculating the preferred size. The Window will be validated after the preferredSize is calculated. 这是在java文档上找到的答案，如果不去找文档象这样你不认识的函数会很多。
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