java Programming Glossary: promotion

What does “GC--” mean in a java garbage collection log?

http://stackoverflow.com/questions/1174976/what-does-gc-mean-in-a-java-garbage-collection-log

PrintGC gclog_or_tty print # Parallel Scavenge Collector promotion_failure_occurred promotion_failed if promotion_failure_occurred.. # Parallel Scavenge Collector promotion_failure_occurred promotion_failed if promotion_failure_occurred clean_up_failed_promotion.. Collector promotion_failure_occurred promotion_failed if promotion_failure_occurred clean_up_failed_promotion if PrintGC gclog_or_tty..

Why are these == but not `equals()`?

http://stackoverflow.com/questions/1259693/why-are-these-but-not-equals

reason for X y being true has to do with binary numeric promotion. When at least one operand to the equality operator is convertible..

When comparing two Integers in Java does auto-unboxing occur?

http://stackoverflow.com/questions/1514910/when-comparing-two-integers-in-java-does-auto-unboxing-occur

values involved. This occurs as part of binary numeric promotion JLS section 5.6.2 . Look at each individual operator's documentation.. other is convertible 禮5.1.8 to numeric type binary numeric promotion is performed on the operands 禮5.6.2 . and for and JLS 15.20.1.. type or a compile time error occurs. Binary numeric promotion is performed on the operands 禮5.6.2 . If the promoted type of..

What is the reason for these PMD rules?

http://stackoverflow.com/questions/1615419/what-is-the-reason-for-these-pmd-rules

in any operations. This rule is letting you know that this promotion is occurring and you might as well use an int . However using..

Promotion in Java?

http://stackoverflow.com/questions/1660856/promotion-in-java

in Java The rules for promotion is when operands are of different types automatic binary numeric.. operands are of different types automatic binary numeric promotion occurs with the smaller operand type being converted to the.. b 2 byte c byte a b Here are the actual rules for numeric promotion from section 5.6.2 of the JLS When an operator applies binary..

Java conditional operator ?: result type

http://stackoverflow.com/questions/2615498/java-conditional-operator-result-type

then there are several cases ... Otherwise binary numeric promotion 禮5.6.2 is applied to the operand types and the type of the conditional.. of the second and third operands. Note that binary numeric promotion performs unboxing conversion 禮5.1.8 and value set conversion..

Is it guaranteed that new Integer(i) == i in Java?

http://stackoverflow.com/questions/2831945/is-it-guaranteed-that-new-integeri-i-in-java

Yes. JLS 禮5.6.2 specifies the rules for binary numeric promotion. In part When an operator applies binary numeric promotion to.. promotion. In part When an operator applies binary numeric promotion to a pair of operands each of which must denote a value that.. unboxing conversion 禮5.1.8 is performed. Binary numeric promotion applies for several numeric operators including the numerical..

Why comparing Integer with int can throw NullPointerException in Java?

http://stackoverflow.com/questions/3352791/why-comparing-integer-with-int-can-throw-nullpointerexception-in-java

the other is convertible to numeric type binary numeric promotion is performed on the operands. If the promoted type of the operands.. point equality test is performed. Note that binary numeric promotion performs value set conversion and unboxing conversion. This..

Why doesn't java.lang.Number implement Comparable?

http://stackoverflow.com/questions/480632/why-doesnt-java-lang-number-implement-comparable

all the Number sub types. The implication of that promotion in terms of mathematics and performance is a bit unclear to..