diff options
Diffstat (limited to 'java.html.markdown')
| -rw-r--r-- | java.html.markdown | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/java.html.markdown b/java.html.markdown index 6753b358..4fdd06cc 100644 --- a/java.html.markdown +++ b/java.html.markdown @@ -95,6 +95,12 @@ public class LearnJava { // Byte - 8-bit signed two's complement integer // (-128 <= byte <= 127) 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 // (-32,768 <= short <= 32,767) @@ -102,7 +108,7 @@ public class LearnJava { // Integer - 32-bit signed two's complement integer // (-2,147,483,648 <= int <= 2,147,483,647) - int fooInt = 1; + int bazInt = 1; // Long - 64-bit signed two's complement integer // (-9,223,372,036,854,775,808 <= long <= 9,223,372,036,854,775,807) @@ -110,7 +116,9 @@ public class LearnJava { // L is used to denote that this variable value is of type Long; // 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 // 2^-149 <= float <= (2-2^-23) * 2^127 |