Difference between revisions of "2011-40-Java3"
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(Created page with "= Opgaver = == Kapitel 12 == === Opgave 3 === ==== Main ==== <source lang="java">package comparator; import java.util.*; public class sorting { public static void main(S...") |
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=== Opgave 3 === | === Opgave 3 === | ||
| − | ==== Main ==== | + | ==== Main ==== |
<source lang="java">package comparator; | <source lang="java">package comparator; | ||
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list.add("c#ftw"); | list.add("c#ftw"); | ||
| − | Collections.sort(list,new | + | Collections.sort(list,new AscendingCompare()); |
print(list); | print(list); | ||
| − | Collections.sort(list,new | + | Collections.sort(list,new DescendingCompare()); |
print(list); | print(list); | ||
| − | Collections.sort(list,new | + | Collections.sort(list,new SecondCharAscendingCompare()); |
print(list); | print(list); | ||
Latest revision as of 09:58, 5 October 2011
Contents
Opgaver
Kapitel 12
Opgave 3
Main
package comparator;
import java.util.*;
public class sorting {
public static void main(String[] args) {
ArrayList list = new ArrayList();
list.add("tiktak");
list.add("egern");
list.add("kæmpeegern");
list.add("somebodywashere");
list.add("wtf");
list.add("java");
list.add("træls");
list.add("kurt");
list.add("green");
list.add("c#ftw");
Collections.sort(list,new AscendingCompare());
print(list);
Collections.sort(list,new DescendingCompare());
print(list);
Collections.sort(list,new SecondCharAscendingCompare());
print(list);
}
public static void print(ArrayList list)
{
for(Object str : list)
{
System.out.println(str.toString());
}
}
}
Ascending Compare
package comparator;
import java.util.*;
public class AscendingCompare implements Comparator<String>
{
@Override
public int compare(String o1, String o2) {
return o1.compareTo(o2); //Her sammenligner vi o1 med o2.
}
}
Descending Compare
package comparator;
import java.util.*;
public class DescendingCompare implements Comparator<String>
{
@Override
public int compare(String o1, String o2) {
return o2.compareTo(o1); //Her gør vi det omvendt. o2 sammenligner vi med o1.
}
}
SecondCharAscendingCompare
package comparator;
import java.util.*;
public class SecondCharAscendingCompare implements Comparator<String>
{
@Override
public int compare(String o1, String o2) {
return o1.charAt(1) - o2.charAt(1); //Her tager vi 2nd tegn og bruger char værdien.
}
}