Description: The coding is a phone book, to record and display the name and telephone number of the contact. When the input value is empty or error, there will be tips.
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File list (Check if you may need any files):
PhoneBook\.classpath
.........\.project
.........\.settings\org.eclipse.jdt.core.prefs
.........\bin\com\PhoneBook.class
.........\src\com\PhoneBook.class
.........\...\...\PhoneBook.java
.........\bin\com
.........\src\com
.........\.settings
.........\bin
.........\src
PhoneBook