assignment: throwing away the old value of a variable and replacing it with a new one
initialization: it's a special kind of assignment: the first. Before initialization objects have null
value and primitive types have default values such as 0
or false
. Can be done in conjunction with declaration.
declaration: a declaration states the type of a variable, along with its name. A variable can be declared only once. It is used by the compiler to help programmers avoid mistakes such as assigning string values to integer variables. Before reading or assigning a variable, that variable must have been declared.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…