Java：定义术语初始化、声明和赋值

Question

我发现defs循环，主语是由他们的动词定义的，但动词是未定义的！那么你如何定义它们呢？

循环定义

初始化：初始化一个变量。可以在申报时进行。

赋值：给变量赋值。它可以在任何地方完成，只有一次使用final-identifier。

声明：向变量声明值。

“更新，尝试用lambda calc理解主题”

D(x type) = (λx.x is declared with type) 
A(y D(x type)) = (λy.y is assigned to D(x type))

%Then after some beta reductions we get initialization.
D(x type) me human                  // "me" declared with type "human"
A(y (D(x type) me human)) asking    // "asking" assigned to the last declaration

%if the last two statemets are valid, an initialization exists. Right?

Answer 1

String declaration;
String initialization = "initialization";
declaration = "initialization"; //late initialization - will initialize the variable.
    // Without this, for example, in java, you will get a compile-time error if you try 
    // to use this variable.

declaration = "assignment"; // Normal assignment. 
    // Can be done any number of times for a non-final variable

Answer 2

赋值：丢弃变量的旧值并用新值替换

初始化：这是一种特殊的分配：第一种。在初始化之前，对象具有null值，基元类型具有默认值，如0或false。可以与声明一起进行。

声明：声明说明变量的类型及其名称。变量只能声明一次。编译器使用它来帮助程序员避免将字符串值赋给整数变量等错误。在读取或赋值变量之前，必须声明该变量。