正如前一章所解释的,多变的在Java中必须是指定的数据类型:
int myNum = 5; // Integer (whole number)
float myFloatNum = 5.99f; // Floating point number
char myLetter = 'D'; // Character
boolean myBool = true; // Boolean
String myText = "Hello"; // String
数据类型分为两组:
byte
,short
,int
,long
,float
,double
,boolean
和char
String
,数组和课程(您将在后面的章节中了解更多相关内容)原始数据类型指定变量值的大小和类型,并且没有附加方法。
Java中有八种基本数据类型:
Data Type | Size | Description |
---|---|---|
byte |
1 byte | Stores whole numbers from -128 to 127 |
short |
2 bytes | Stores whole numbers from -32,768 to 32,767 |
int |
4 bytes | Stores whole numbers from -2,147,483,648 to 2,147,483,647 |
long |
8 bytes | Stores whole numbers from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 |
float |
4 bytes | Stores fractional numbers. Sufficient for storing 6 to 7 decimal digits |
double |
8 bytes | Stores fractional numbers. Sufficient for storing 15 decimal digits |
boolean |
1 bit | Stores true or false values |
char |
2 bytes | Stores a single character/letter or ASCII values |
截取页面反馈部分,让我们更快修复内容!也可以直接跳过填写反馈内容!