Java是一种静态类型的语言。 这意味着必须先声明所有变量,然后才能使用它们 。boolean flag = true; int counter = 20; 2. Types of data type in Java Java支持两种数据类型,即primitive data type和non-primitive或reference data type 。 2.1. Primitive Data Types 基本数据类型directly在内存中保存一个值。
A primitive data type specifies the type of a variable and the kind of values it can hold. There are eight primitive data types in Java: Data TypeDescription byteStores whole numbers from -128 to 127 shortStores whole numbers from -32,768 to 32,767 ...
如图2.1所示,Java语言有8种基本数据类型,分为4类:逻辑型、字符型、整数型、小数型。 下面是SUN公司对Java8种基本数据类型的定义 1 类型 说明 1 byte The byte data type is an 8-bit signed two’s complement integer 2 short The short data type is a 16-bit signed two’s complement integer 3 int...
Java Data Type The data type of the variable determines therange of the valuesthat the memory location can hold. Therefore, the amount ofmemory allocated for a variable depends on its data type. For example, 32 bits of memory is allocated for a variable of the'int'data type. Java is a ...
Java的数据类型分为两大类:简单类型(primitive type,也称为原始类型)和引用类型(reference type)。简单类型,顾名思义,就是存储和操作都比较简单的数据类型,从另一个名字“原始(或者原生)”可以看出,简单类型就是其他数据类型的基础和根本,是根源和出处。都可以从简单类型这里衍生而来。
Data Types in Java In Java, Data types are classified into two categories: 1. Primitive Data Type 2. Non-Primitive Data Type there are 8 primitive data types: char boolean byte short int long float double 8 primitive can be classfiied into 4 groups;...
The String data type is used to store a sequence of characters (text). String values must be surrounded by double quotes:Example String greeting = "Hello World"; System.out.println(greeting); Try it Yourself » The String type is so much used and integrated in Java, that some call ...
Java is astrongly typed language(强类型语音). This means thatevery variable must have a declared type(每个变量都必须声明类型). There are eightprimitive typesin Java(Java有8种原始类型). Four of them are integer types; two are floatingpoint number types; one is the character type char, used...
type. These sizes do not change from one operating system to another. This is one of the key features of the language that makes Java so portable. Java defines eight primitive types of data: byte, short, int, long, char, float, double, and boolean. The primitive types are also commonly...
staticDataTypegetDataType(java.lang.String name) Gets theDataTypethat has the specified name. java.lang.StringgetName() Gets the name of thisDataType. booleanmatchesCategory(int category) Indicates whether category of thisDataTypematches the specified category. ...