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1. Data types (eight types):
1. The computer's storage carry: bit is the smallest unit of storage data, and so on, as shown in the figure:
2. In java we can use 0b or 0x to represent binary and hexadecimal
Such as: 0xABC or 0b01010001;
3. In the data storage in java, the high bit is 1 is a negative number, and the high bit is 0 is a positive number;
4. Detailed explanation of Java data types:
Integer value: int short: less than 32767 byte: less than 127
Decimal value: double
Single quotes: char (numbers can be assigned) boolean: true, false
①Integer type (four types): byte short int long, as shown in the figure:
②Character type: char, as shown in the figure:
③Floating point type: float double
④ Boolean type: boolean
