Problems and Example java




File list:
BaitapJava
.........\ExceptionExample
.........\................\AnotherExample.class
.........\................\AnotherExample.java
.........\................\Date.class
.........\................\Date.java
.........\................\DateTester.class
.........\................\DateTester.java
.........\................\DemoClass.class
.........\................\DemoClass.java
.........\................\InvalidDayException.class
.........\................\InvalidDayException.java
.........\................\InvalidMonthException.class
.........\................\InvalidMonthException.java
.........\................\InvalidYearException.class
.........\................\InvalidYearException.java
.........\................\NumberTooBigException.class
.........\................\NumberTooBigException.java
.........\................\NumberTooSmallException.class
.........\................\NumberTooSmallException.java
.........\................\Oops.class
.........\................\Oops.java
.........\................\PropagationTester.class
.........\................\PropagationTester.java
.........\................\ThrowDemo.class
.........\................\ThrowDemo.java
.........\lab05 - libraryFilesForStudents
.........\...............................\CSE00PRG.marks
.........\...............................\Student.java
.........\New folder
.........\..........\AnotherExample.java
.........\..........\Date.java
.........\..........\DateTester.java
.........\..........\DemoClass.java
.........\..........\InvalidDayException.java
.........\..........\InvalidMonthException.java
.........\..........\InvalidYearException.java
.........\..........\NumberTooBigException.java
.........\..........\NumberTooSmallException.java
.........\..........\Oops.java
.........\..........\PropagationTester.java
.........\..........\TankMenu.java
.........\..........\ThrowDemo.java
.........\ViduJava
.........\........\Animal.java
.........\........\AttributeHidingExample.java
.........\........\CattleBeast.java
.........\........\ChildClass.java
.........\........\Emu.java
.........\........\Kangaroo.java
.........\........\Koala.java
.........\........\MilkingCow.java
.........\........\ParentClass.java
.........\baigiai_abstract.doc
.........\baitap_Java_abstract.doc
.........\baitap_Java_class.doc
.........\baitap_Java_class1.doc
.........\baitap_Java_exception.doc
.........\baitap_Java_inheritance.doc
.........\baitap_Java_inheritance.docx
.........\baitap_java_interfac1e.doc
.........\baitap_java_interface.doc
.........\baitap_Java_textFile.doc
.........\chuong5_FileIO.pdf
.........\Thumbs.db
.........\~$itapJava.doc
.........\~$itap_Java_abstract.doc
.........\~$itap_Java_inheritance.doc
.........\~$itap_java_interface.doc