java基础类型的byte为长度
java基础类型的字节长度：
类型byte数/位数最⼤/最⼩值
byte1/8127/-128
short2/1632767/-32768
int 4/322147483647/-2147483648
long8/64 9223372036854775807/-9223372036854775808 float4/32 3.4028235E38/1.4E-45
double8/64 1.7976931348623157E308/4.9E-324
char2/16
boolean1/8
其中，float和double的最⼩值是能表⽰的最⼩精度值，不是最⼩负数值。
在java中查看byte长度和最⼤最⼩值的⽅式：
import org.junit.Test;
public class AnyTest {
@Test
public void test01() {
System.out.println("Byte: "+Byte.MAX_VALUE+"###"+Byte.MIN_VALUE+" byte_number: "+Byte.SIZE);
System.out.println("Short: "+Short.MAX_VALUE+"###"+Short.MIN_VALUE+" byte_number: "+Short.SIZE);
float几个字节多少位System.out.println("Integer: "+Integer.MAX_VALUE+"###"+Integer.MIN_VALUE+" byte_number: "+Integer.SIZE);
System.out.println("Long: "+Long.MAX_VALUE+"###"+Long.MIN_VALUE+" byte_number: "+Long.SIZE);
System.out.println("Float: "+Float.MAX_VALUE+"###"+Float.MIN_VALUE+" byte_number: "+Float.SIZE);
System.out.println("Double: "+Double.MAX_VALUE+"###"+Double.MIN_VALUE+" byte_number: "+Double.SIZE);
System.out.println("Char: "+" byte_number: "+Character.SIZE);
}
}
输出：
Byte: 127###-128 byte_number: 8
Short: 32767###-32768 byte_number: 16
Integer: 2147483647###-2147483648 byte_number: 32
Long: 9223372036854775807###-9223372036854775808 byte_number: 64
Float: 3.4028235E38###1.4E-45 byte_number: 32
Double: 1.7976931348623157E308###4.9E-324 byte_number: 64
Char: byte_number: 16
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