Some columns Java code, with a great help for beginners, including some important code

Java
....\ArrayCopyTest[1].java
....\BookDetails.java
....\BookDetails[1].java
....\build.xml
....\CalendarTest.java
....\CalendarTest[1].java
....\CloneString.java
....\CloneString[1].java
....\DateFormatDemo.java
....\DateFormatDemo[1].java
....\DateFormatDemo[2].java
....\DateFormatTest.java
....\DateFormatTest[1].java
....\DateFormatTest[2].java
....\DateTest.java
....\DateTest[1].java
....\DateTest[2].java
....\EqualDemo.java
....\EqualDemo[1].java
....\EqualDemo[2].java
....\EqualDemo[3].java
....\EqualsDemo.java
....\ExecDemo.java
....\ExecDemo[1].java
....\GetCharsDemo.java
....\GetPropertiesDemo.java
....\IteratorTest.java
....\manifest.mf
....\MathDemo.java
....\MemoryDemo.java
....\Person.java
....\PersonDemo.java

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