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class Father{
int i,j;

Father(){
add(1);
}
void add(int v){
i+=v;
j+=v;
}
void print(){
System.out.println("i:="+i);
System.out.println("j:="+j);
}
}
class C ......

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import java.util.prefs.*;  
public class Registery {  
    String[] keys = {"oa"};  
    String[] values = {"reg"};  
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    public void writeValue() {   ......

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import java.net.Unknow ......
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