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public class emptystring
{
public static void main(String[] args)
{
System.out.println("null".equals(n(0) + ""));
System.out.println("null".equals("" + n(0)));
System.out.println("x".equals(n(1) + ""));
System.out.println("x".equals("" + n(1)));
}
static String n(int i)
{
if (i==0) return null; else return "x";
}
}
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