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TestList.java
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executable file
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import java.util.* ;
public class TestList {
public static void main( String[] args )
{
testLinkedLists() ;
testArrays() ;
}
public static void testLinkedLists()
{
LinkedList myList = new LinkedList() ;
myList.add( "Hello" ) ;
myList.add( "Java" ) ;
myList.add( "Generics" ) ;
myList.add( "World!" ) ;
System.out.println( myList ) ;
}
public static void testArrays()
{
ArrayList myList = new ArrayList() ;
myList.add( "String 1" ) ;
myList.add( "String 2" ) ;
myList.add( "String 3" ) ;
myList.add( "String 4" ) ;
myList.add( "String 5" ) ;
myList.add( "String 6" ) ;
myList.add( "String 7" ) ;
List subList = myList.subList( 1, 5 ) ; // 1st View
List subSubList = subList.subList( 2, 4 ) ; // View of a View
ListIterator myIter = myList.listIterator() ;
Iterator subIter = subList.iterator() ;
System.out.println( subList.getClass() ) ;
System.out.println( myList.getClass() ) ;
System.out.println( "myList: " + myList ) ;
System.out.println( "subList: " + subList ) ;
System.out.println( "subSubList: " + subSubList ) ;
System.out.println( "First myIter: " + myIter.next() ) ;
System.out.println( "First subIter: " + subIter.next() ) ;
// non-structural modifications - permitted, does not invalidate views
myList.set( 6, "myList Modified This." ) ;
subList.set( 1, "subList Modified This." ) ;
subSubList.set( 1, "SubSubList Modified This." ) ;
myIter.set( "myIter Modified This." ) ;
System.out.println( "myList: " + myList ) ;
System.out.println( "subList: " + subList ) ;
System.out.println( "subSubList: " + subSubList ) ;
System.out.println( "myIter: " + myIter ) ;
System.out.println( "subIter: " + subIter ) ;
// structural modifications
System.out.println( "\n\n" ) ;
if ( false ) {
System.out.println( "Structural Change via subList..." ) ;
subList.add( "Added by subList 1" ) ;
subList.add( "Added by subList 2" ) ;
subList.add( "Added by subList 3" ) ;
/*
Structural Change via subList...
subList: [String 2, subList Modified This., String 4, SubSubList Modified This., Added by subList 1, Added by subList 2, Added by su
bList 3]
ERROR accessing myIter: java.util.ConcurrentModificationException
ERROR accessing subIter: java.util.ConcurrentModificationException
ERROR accessing subSubList: java.util.ConcurrentModificationException
myList: [myIter Modified This., String 2, subList Modified This., String 4, SubSubList Modified This., Added by subList 1, Added by
subList 2, Added by subList 3, String 6, myList Modified This.]
*/
}
if ( false ) {
System.out.println( "Structural Change via subSubList..." ) ; // why is subList still not invalid?
subSubList.add( "Added by subSubList 1" ) ;
subSubList.add( "Added by subSubList 2" ) ;
subSubList.add( "Added by subSubList 3" ) ;
/*
Structural Change via subSubList...
subList: [String 2, subList Modified This., String 4, SubSubList Modified This., Added by subSubList 1, Added by subSubList 2, Added
by subSubList 3]
ERROR accessing myIter: java.util.ConcurrentModificationException
ERROR accessing subIter: java.util.ConcurrentModificationException
subSubList: [String 4, SubSubList Modified This., Added by subSubList 1, Added by subSubList 2, Added by subSubList 3]
myList: [myIter Modified This., String 2, subList Modified This., String 4, SubSubList Modified This., Added by subSubList 1, Added
by subSubList 2, Added by subSubList 3, String 6, myList Modified This.]
*/
}
if ( false ) {
System.out.println( "Structural Change via myList..." ) ;
myList.add( "Added by myList 1" ) ;
myList.add( "Added by myList 2" ) ;
myList.add( "Added by myList 3" ) ;
/*
Structural Change via myList...
ERROR accessing subList: java.util.ConcurrentModificationException
ERROR accessing myIter: java.util.ConcurrentModificationException
ERROR accessing subIter: java.util.ConcurrentModificationException
ERROR accessing subSubList: java.util.ConcurrentModificationException
myList: [myIter Modified This., String 2, subList Modified This., String 4, SubSubList Modified This., String 6, myList Modified Thi
s., Added by myList 1, Added by myList 2, Added by myList 3]
*/
}
if ( false ) {
System.out.println( "Structural Change via myIter..." ) ;
myIter.add( "Added by myIter 1" ) ;
myIter.add( "Added by myIter 2" ) ;
myIter.add( "Added by myIter 3" ) ;
/*
Structural Change via myIter...
ERROR accessing subList: java.util.ConcurrentModificationException
Second myIter: String 2
ERROR accessing subIter: java.util.ConcurrentModificationException
ERROR accessing subSubList: java.util.ConcurrentModificationException
myList: [myIter Modified This., Added by myIter 1, Added by myIter 2, Added by myIter 3, String 2, subList Modified This., String 4,
SubSubList Modified This., String 6, myList Modified This.]
*/
}
if ( false ) {
System.out.println( "Structural Change via subIter..." ) ;
subIter.remove() ;
/*
Structural Change via subIter...
subList: [subList Modified This., String 4, SubSubList Modified This.]
ERROR accessing myIter: java.util.ConcurrentModificationException
Second subIter: subList Modified This.
ERROR accessing subSubList: java.util.ConcurrentModificationException
myList: [myIter Modified This., subList Modified This., String 4, SubSubList Modified This., String 6, myList Modified This.]
*/
}
// What's affected by structural modifications
System.out.println( "\n\n" ) ;
try {
System.out.println( "subList: " + subList ) ; // valid!
}
catch ( Exception e ) {
System.out.println( "ERROR accessing subList: " + e ) ; // Exception Thrown: java.util.ConcurrentModificationException
}
try {
System.out.println( "Second myIter: " + myIter.next() ) ; // should get exception
}
catch ( Exception e ) {
System.out.println( "ERROR accessing myIter: " + e ) ; // Exception Thrown: java.util.ConcurrentModificationException
}
try {
System.out.println( "Second subIter: " + subIter.next() ) ; // should get exception
}
catch ( Exception e ) {
System.out.println( "ERROR accessing subIter: " + e ) ; // Exception Thrown: java.util.ConcurrentModificationException
}
try {
System.out.println( "subSubList: " + subSubList ) ; // should get exception
}
catch ( Exception e ) {
System.out.println( "ERROR accessing subSubList: " + e ) ; // Exception Thrown: java.util.ConcurrentModificationException
}
try {
System.out.println( "myList: " + myList ) ; // seems to be valid! Only Views & Iters Invalidated!
}
catch ( Exception e ) {
System.out.println( "ERROR accessing myList: " + e ) ;
}
}
}