Admin: 1 версия

2010-06-01T05:04:07Z

1 версия

в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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== Keeping upper and lowercase letters together ==



<source lang="java">
import java.util.Arrays;
import java.util.ruparator;
public class MainClass {
public static void main(String[] args) {
String[] sa = new String[] { "adf", "fdsa", "ASDF", "FSA", "r", "R" };
System.out.println("Before sorting: " + Arrays.asList(sa));
Arrays.sort(sa, new AlphabeticComparator());
System.out.println("After sorting: " + Arrays.asList(sa));
}
}
class AlphabeticComparator implements Comparator {
public int compare(Object o1, Object o2) {
String s1 = (String) o1;
String s2 = (String) o2;
return s1.toLowerCase().rupareTo(s2.toLowerCase());
}
}
/**/</source>



<pre class=codeResult>Before sorting: [adf, fdsa, ASDF, FSA, r, R]
After sorting: [adf, ASDF, fdsa, FSA, r, R]</pre>

== Reversing Order ==



<source lang="java">
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class MainClass {
public static void main(String[] a) {
List list = new ArrayList();
list.add("A");
list.add("C");
list.add("B");
Collections.sort(list, Collections.reverseOrder());
System.out.println(list);
}
}</source>



<pre class=codeResult>[C, B, A]</pre>

== Sorting a Collection containing user defined Objects ==



<source lang="java">
import java.util.Arrays;
class Person implements Comparable<Person> {
public Person(String firstName, String surname) {
this.firstName = firstName;
this.surname = surname;
}
public String toString() {
return firstName + " " + surname;
}
public int compareTo(Person person) {
int result = surname.rupareTo(person.surname);
return result == 0 ? firstName.rupareTo(((Person) person).firstName) : result;
}
private String firstName;
private String surname;
}
public class MainClass {
public static void main(String[] args) {
Person[] authors = { new Person("A", "B"),
new Person("C", "D"),
new Person("E", "F"),
new Person("Z", "Y"),
new Person("X", "T"),
new Person("O", "R") };
Arrays.sort(authors);
System.out.println("\nThe cast is ascending sequence is:\n");
for (Person person : authors) {
System.out.println(person);
}
}
}</source>



<pre class=codeResult>The cast is ascending sequence is:
A B
C D
E F
O R
X T
Z Y</pre>

== Sorting a List ==



<source lang="java">
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
public class MainClass {
public static void main(String args[]) throws Exception {
List list = Arrays.asList("a","c","b");
Collections.sort(list);
for (int i = 0, n = list.size(); i < n; i++) {
if (i != 0)
System.out.print(", ");
System.out.print(list.get(i));
}
System.out.println();
}
}</source>



<pre class=codeResult>a, b, c</pre>

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Admin: 1 версия

в 17:44, 31 мая 2010