using java, implement the encoding and deconding function

DSA_HW1_2
.........\.classpath
.........\.DS_Store
.........\.project
.........\.settings
.........\.........\org.eclipse.jdt.core.prefs
.........\bin
.........\...\MH.class
.........\...\SingleNode.class
.........\...\SinglyLinkedList$SNIterator.class
.........\...\SinglyLinkedList.class
.........\doc
.........\...\allclasses-frame.html
.........\...\allclasses-noframe.html
.........\...\class-use
.........\...\.........\MH.html
.........\...\.........\SingleNode.html
.........\...\.........\SinglyLinkedList.html
.........\...\constant-values.html
.........\...\deprecated-list.html
.........\...\help-doc.html
.........\...\index-files
.........\...\...........\index-1.html
.........\...\...........\index-10.html
.........\...\...........\index-11.html
.........\...\...........\index-2.html
.........\...\...........\index-3.html
.........\...\...........\index-4.html
.........\...\...........\index-5.html
.........\...\...........\index-6.html
.........\...\...........\index-7.html
.........\...\...........\index-8.html
.........\...\...........\index-9.html
.........\...\index.html
.........\...\MH.html
.........\...\overview-tree.html
.........\...\package-frame.html
.........\...\package-list
.........\...\package-summary.html
.........\...\package-tree.html
.........\...\package-use.html
.........\...\resources
.........\...\.........\inherit.gif
.........\...\SingleNode.html
.........\...\SinglyLinkedList.html
.........\...\stylesheet.css
.........\src
.........\...\MH.java
.........\...\SingleNode.java
.........\...\SinglyLinkedList.java

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