Java-Let the result of the 3 become

The original source is a foreign forum in a post in the landlord question: How to let 1+1=3?
So there are the various language implementation of the various mechanisms of the answer, of course, including the direct use of the string output "1+1=3" ...
Finally, the answer is implemented in the Java language.

Here's the answer:

 Public Static void throws illegalaccessexception, nosuchfieldexception {        = Integer.  Class. getdeclaredclasses () [0];         = Cache.getdeclaredfield ("cache");        C.setaccessible (true);         = (integer[]) c.get (cache);        array[] = array[131];        System.out.printf ("%d", 1 + 1);}

　　

Author explains:
You need to change it even deeper than you can typically access.
Note that this was designed for Java 6 with no funky parameters passed in on the JVM that would otherwise change the intege Rcache.
Deep within the integers class is a Flyweight of integers.
This is a array of integers from +127. CACHE[132] is the spot where 4 would normally be. Set it to 5.

That's a very clear idea.
Integer.class.getDeclaredClasses () [0] points to the Integercache class, whose cache domain is initialized within the static initialization block, and caches 128 to 127, as the cache[130]==2.

Static {    //High value is configured by property    intH = 127; String Integercachehighpropvalue=Sun.misc.VM.getSavedProperty ("Java.lang.Integer.IntegerCache.high"); if(Integercachehighpropvalue! =NULL) {        inti =parseint (Integercachehighpropvalue); I= Math.max (i, 127); //Maximum array size is Integer.max_valueh = math.min (i, Integer.max_value-(-Low )); } High=h; Cache=Newinteger[(high-low) + 1]; intj =Low ;  for(intk = 0; K < Cache.length; k++) Cache[k]=NewInteger (j + +);}

So write the following code, but unfortunately the result is still 2:

 Public Static void throws illegalaccessexception, nosuchfieldexception {        = Integer.  Class. getdeclaredclasses () [0];         = Cache.getdeclaredfield ("cache");        C.setaccessible (true);         = (integer[]) c.get (cache);        array[] = array[131];        System.out.println (+);}

The problem is in printf or println.

Referring to the Println method declaration, the author provides overwrite for different basic types, and printf does not provide a method for the base type.
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Although printf ("%d", plus) is equivalent to System.out.println (String.Format ("%d", 1 + 1));
But the essence of the problem is that the result of println is still the basic type and is not boxed.
That is, System.out.println (Integer), the result is 3.

Java-Let the result of the 3 become