Set window size

java I would like to add to the window adjustment range , that is, can adjust to a maximum value, the minimum can be adjusted to a certain value , the code how to achieve ?
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buddy I want is inside the code . Do not you write me ?  

if(frame.getWidth() > 800 || frame.getHeight() > 600){
      frame.setPreferredSize(new Dimension(800,600));
      frame.pack();
  }

so simple that he can not write ?
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public void setMinimumSize (Dimension minimumSize)
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set the maximum public Dimension getMaximumSize ()
minimum getMinimumSize ()
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frame.addComponentListener(new ComponentAdapter(){
      @Override public void componentResized(ComponentEvent e){
          // 如果frame的大小超过了，重新设置frame的大小。
      }
  });

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buddy I want is inside the code . Do not you write me ?
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buddy I want is inside the code . Do not you write me ?  

a judge sentences only, exceeds the maximum, put the width and height is set to the maximum force , less than the minimum will be set to the minimum.
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buddy I want is inside the code . Do not you write me ?          
  

if(frame.getWidth() > 800 || frame.getHeight() > 600){
      frame.setPreferredSize(new Dimension(800,600));
      frame.pack();
  }

  
so simple that he can not write ?  

I'm just beginning to learn java I wrote above you have not used your code above can be achieved, but there is BUG, windows can still be pulled Japan pull a small , sometimes it can
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The problem is not one size JavaBeans bound property , can not monitor size changes.
The above code just write exceeds the maximum size of the how to do,
write the result of the mouse can drag big , becomes an open back.