Troubleshooting No. problem solution 1 missing tray icon when closing skype sudo apt-get install sni-qt:i386 2 fix dependencies sudo apt-get install -f 3 lookup all files grep -r “regular expression” * 4 CANNOT change pwd [recovery mode] mount -rw -o...
Item 12 Consider implementing Comparable Unlike others, the compareTo method is not declared in Object. It is the sole method in the Comparable interface (similar to Object’s equals method). It is generic. natural ordering: like Arrays.sort(a); 1.A case in point...
Item 11: Override clone judiciously The Cloneable interface is intended to permit cloning. Unfortunately, it fails to serve this purpose. Its primary flaw is that it lacks a clone method. Cloneable fails to function as an interface because it lacks...
Sample 1 The bar chart below shows the proportions of English men and women of different ages who were living alone in 2011. The pie chart compares the numbers of bedrooms in these one-person households. Living alone in England by...
Item 9: Always override hashCode when you override equals Failure to override hashCode in every class that overrides equals will prevent classes from functioning properly in conjunction with all hash-based collections. (HashMap , HashSet , and Hashtable) 1.the general contract...