Update java.html.markdown

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Andrew Gallasch 2016-10-27 23:38:44 +10:30 committed by GitHub
parent db47ffd5c9
commit e01c16e568

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@ -95,6 +95,12 @@ public class LearnJava {
// Byte - 8-bit signed two's complement integer // Byte - 8-bit signed two's complement integer
// (-128 <= byte <= 127) // (-128 <= byte <= 127)
byte fooByte = 100; byte fooByte = 100;
// If you would like to interpret a byte as an unsigned integer
// then this simple operation can help
int unsignedIntLessThan256 = 0xff & fooByte;
// this contrasts a cast which can be negative.
int signedInt = (int) fooByte;
// Short - 16-bit signed two's complement integer // Short - 16-bit signed two's complement integer
// (-32,768 <= short <= 32,767) // (-32,768 <= short <= 32,767)
@ -110,7 +116,9 @@ public class LearnJava {
// L is used to denote that this variable value is of type Long; // L is used to denote that this variable value is of type Long;
// anything without is treated as integer by default. // anything without is treated as integer by default.
// Note: Java has no unsigned types. // Note: byte, short, int and long are signed. They can have positive and negative values.
// There are no unsigned variants.
// char, however, is 16-bit unsigned.
// Float - Single-precision 32-bit IEEE 754 Floating Point // Float - Single-precision 32-bit IEEE 754 Floating Point
// 2^-149 <= float <= (2-2^-23) * 2^127 // 2^-149 <= float <= (2-2^-23) * 2^127