我知道==
意味着等于,但我无法弄清楚=
意味着什么。
A single =
is assignment. A value is assigned to a variable.
int a = 1; // <-- assign 1 to a.
JLS-15.26.1. Simple Assignment Operator =
says (in part)
A compile-time error occurs if the type of the right-hand operand cannot be converted to the type of the variable by assignment conversion ( §5.2 ).
The ==
is the equality operator, JLS-15.21. Equality Operators says (in part),
The operators
==
(equal to) and!=
(not equal to) are called the equality operators .
=
means assignment operator which assigns the value on its right to the operand on its left whereas ==
(Equal to) means equality check.
Say, you want to assign 1
into a variable i
, so you have to write:
i = 1;
But if you want to check whether the value of i
is 1
or not, you have to check:
if (i == 1) {
//do something
} else {
// do something else
}
=
is the assignment operator. Eg, a = 5
means assigning the value of 5
to the variable a
.
the operator "=" assign the value to a certain instance
an operator "==" means a certain instance has a value of something
example
x = 2; //It means x is 2
x == 2; //means x has a value of 2
=
is the assignment operator which is used to assign a value to a variable, property or fields. While ==
is used to check a condition for example in a if
condition
int houseAddress = 1;
This means that the variable houseAddress is given the value of 1, so you can think of this as the address of the house is equal to 1;
if(houseAddress == 1){
//do something
}
This code is saying whether houseAddress is equal to 1 this would return TRUE or FALSE in this case we know that houseAddress is 1 so it return TRUE.
Hope this helps its missing a few technical detail which might confuse you so its missed out.
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