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True.
False. The sort method of the Collections class can be used without a Comparator object to sort a list into ascending order according to the natural ordering of its elements.
False. The sort method of the Collections class is a static method.
False. The Collections class provides a large number of very interesting and useful methods, such as sort , binarySearch , copy , reverse , and reverseOrder . The Collections class does not provide a method named ternarySearch .
True.
True.
False. Collection is an interface and Collections is a class.
True.
Tom TOM Joe JOE Bill BILL
Listing 1 . Comparator06.java . |
---|
//File Comparator06.java
//Copyright 2001, R.G.Baldwinimport java.util.*;
import java.io.Serializable;public class Comparator06{
public static void main(String args[]){
new Worker().doIt();}//end main()
}//end class Comparator06class Worker{
public void doIt(){Iterator iter;
Collection ref;ref = new LinkedList();
Populator.fillIt(ref);Collections.sort((List)ref, new TheComparator());
iter = ref.iterator();while(iter.hasNext()){
System.out.print(iter.next() + " ");}//end while loop
System.out.println();}//end doIt()
}// end class Workerclass Populator{
public static void fillIt(Collection ref){ref.add("Joe");
ref.add("Bill");ref.add("Tom");
ref.add("JOE");ref.add("BILL");
ref.add("TOM");}//end fillIt()
}//end class Populatorclass TheComparator implements Comparator,Serializable{
public int compare(Object o1,Object o2){if(!(o1 instanceof String))
throw new ClassCastException();if(!(o2 instanceof String))
throw new ClassCastException();//Do an upper-case comparison
int result = ((String)o1).compareTo(((String)o2));return result*(-1);
}//end compare()}//end class TheComparator |
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