If the variable is static, you can have tens of thousands of instances pointing at the same 32 bits. If the variable is not static, each instance gets its own copy, which for tens of thousands of ...

See the Java 101 Java interfaces tutorial for a more in-depth introduction to using interfaces in your Java programs, including where and where not to use default, static, and private methods.

a Thread.sleep() method held within a lock; final classes that have protected fields; self-assignments of local variables; and; redundant comparisons of null values. FindBugs combined with PMD ...