The big question of Java FAQ

Import Java.util.*;import Java.math.biginteger;public class fiftysixth{public        static void Main (string[] args) {                BigInteger one = new BigInteger ("$");                BigInteger The new BigInteger ("the");                BigInteger three = new BigInteger ("50000");                BigInteger total = Biginteger.zero;                Total.add (one);                Total.add (both);                Total.add (three);                SYSTEM.OUT.PRINTLN (total);}        }

How much output?

0

How could it be? Isn't it a plus?

Note that BigInteger is an immutable type.

Immutable types:

String,integer,bigdecimal,long,charactor,short,byte,boolean,float,double

And look at the BigInteger method:

BigIntegeradd(BigInteger val)Returns a BigInteger whose value is(this + val)

BigInteger divide(BigInteger val)Returns a BigInteger whose value is (this / val) .

int intValue()Converts this BigInteger to an int .

BigIntegernegate()Returns a BigInteger whose value is(-this)

BigIntegersubtract(BigInteger val)Returns a BigInteger whose value is (this - val) .

It can be observed that the return value of subtraction is BigInteger, which also means that the final operation is to return the result, but does not change the original value.

I can understand that.

int i=0;

i+1+2+3+4+5+6;

So what is the value of I? Of course it's 0!!!

The big question of Java FAQ