Java Operators – Difference Between a += b and a =+ b, a++ and ++a

java

As I mentioned in the title,

What is the difference between a += b and a =+ b , also a++ and ++a ? I'm little confused

Best Answer

a += b is equivalent to a = a + b

a = +b is equivalent to a = b

a++ and ++a both increment a by 1. The difference is that a++ returns the value of a before the increment whereas ++a returns the value after the increment.

That is:

a = 10;
b = ++a; //a = 11, b = 11

a = 10;
b = a++; //a = 11, b = 10

Related Solutions

Java – Difference Between x++ and ++x in Java

++x is called preincrement while x++ is called postincrement.

int x = 5, y = 5;

System.out.println(++x); // outputs 6
System.out.println(x); // outputs 6

System.out.println(y++); // outputs 5
System.out.println(y); // outputs 6

Difference Between += and =+ in Java – Explained

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.)

Best Answer

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Java – Difference Between x++ and ++x in Java

Difference Between += and =+ in Java – Explained

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