What is the difference between += and =+?

by 
i += 4;

means

i = i + 4;  // increase i by 4.

While

i =+ 4;

is equivalent to

i = +4;   // assign 4 to i. the unary plus is effectively no-op.

(See http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.15.3 for what a unary + does.)

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