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public class EchoDefaultSystemEncoding
{
    public static void main(String[] args)
    {
           String encoding = System.getProperty("file.encoding");
           System.out.println("Default System Encoding:" + encoding);
    }
}


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  ArrayList list = new ArrayList();
//·½·¨Ò»
  for(int i=0;i<stra.length;i++){
   int n=0;
  ......

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 /**
  * @param args
  */
 public static void main(String[] args) {
  /**
   * ÇóÖÊÊýºÍ£¬
   * Èç:
   * sum(1)=2=2
   * sum(2)=2+3=5
   * sum(3)=2+3+5=10
   * sum(4)=2+3+5+7=17
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