TICS Coding Standard Viewer 
TIOBE Software Quality Framework
Print-friendly version
©TIOBE Software www.tiobe.com
 
TIOBE - Java Coding Standard
Search

Rule:  Design40Checked automatically with code checker

Synopsis:Static DateFormatter objects should be accessed in a synchronized manner
Language:Java
Severity Level:2
Category:Design


Description:
SimpleDateFormat is not synchronized. Sun recomends separate format instances for each thread. If multiple threads must access a static formatter, the formatter must be synchronized either on method or block level.
public class Foo {
    private static final SimpleDateFormat sdf = new SimpleDateFormat();
    void bar() {
        sdf.format(); // bad
    }
    synchronized void foo() {
        sdf.format(); // good
    }
}