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public    class           PassValue{
    static void exchange(int a, int b){//¾²Ì¬·½·¨£¬½»»»a,bµÄÖµ
        int temp;
        temp = a;
        a = b;
        b = temp;
    }
    public static void main(String[] args){
       int i = 10;
       int j = 100;
       System.out.println("before call: " + "i=" + i + "\t" + "j = " + j);//µ÷ÓÃǰ
        exchange(i, j);                                                                    //Öµ´«µÝ£¬main·½·¨Ö»Äܵ÷Óþ²Ì¬·½·¨
        System.out.println("after call: " + "i=" + i + "\t" + "j = " + j);//µ÷Óúó
    }
}
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        before call: i = 10        j = 100
        after    call: i


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public boolean copy(String from, String to) {
  boolean temp=true;
  FileInputStream stream;
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   stream = new FileInputStream(new File(from));
   FileOutputStream bos = new FileOutputStream(to);
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