What are the basic data types in Java?
1、整型,byte 、short 、int 、long
byte 的取值范围:-128~127(-2的7次方到2的7次方-1)
short 的取值范围:-32768~32767(-2的15次方到2的15次方-1)
int 的取值范围:-2147483648~2147483647(-2的31次方到2的31次方-1)
long 的取值范围:-9223372036854774808~9223372036854774807(-2的63次方到2的63次方-1)
2、浮点型,float、double
float 和 double 都是表示浮点型的数据类型,它们之间的区别在于精确度的不同。
float(单精度浮点型)取值范围:3.402823e+38~1.401298e-45(e+38 表示乘以10的38次方,而e-45 表示乘以10的负45次方)
double(双精度浮点型)取值范围:1.797693e+308~4.9000000e-324(同上)
3、字符型,char。
char ch = 'a'; // 可以是汉字,因为是Unicode编码 char ch = 1010; // 可以是十进制数、八进制数、十六进制数等等。 char ch = '\0'; // 可以用字符编码来初始化,如:'\0' 表示结束符,它的ascll码是0,这句话的意思和 ch = 0 是一个意思。
4、布尔型,boolean。
取值就两个:true、false。
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