The assignment statement is used to store a value in a variable.
variableName = expression;
The variable variableName is assigned the value of the expression on the right hand side of the = symbol. Such a value can be (a reference to) an object, or some data of a different type (see later). After the assignment, the value of a variable stays unchanged till the next assignment.
line = "java";
The result of the execution of the assignment is that afterward line denotes (the object denoted by) "java".
Example: what is the meaning of the following statement?
s = s.concat("yyy");
The execution of the statement amounts to:
If the value of s before the execution of the assignment was "xxx", after the assignment the value of s is "xxxyyy".
Note: an assignment is different from an equality test (which we will see in Unit 4).