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public boolean copy(String from, String to) {
  boolean temp=true;
  FileInputStream stream;
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   int bytesRea ......

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Properties props=System.getProperties(); //ϵͳÊôÐÔ
System.out.println("JavaµÄÔËÐл·¾³°æ±¾£º"+props.getProperty("java.version"));
System.out.println("JavaµÄÔËÐл·¾³¹©Ó¦ÉÌ£º"+props.getProperty("java.vendor"));
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Calendar time=Calendar.getInstance();
time.clear();
time.set(Calendar.YEAR,year); //year Ϊ int
time.set(Calendar.MONTH,i-1);//×¢Òâ,Calendar¶ÔÏóĬÈÏÒ»ÔÂΪ0          
int day=time.getActualMaximum(Calendar.DAY_OF_MONTH) ......
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