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Object Ordering java ÅÅÐò

Object Ordering
A List l may be sorted as follows.
Collections.sort(l);
If the List consists of String elements, it will be sorted into alphabetical order. If it consists of Date elements, it will be sorted into chronological order. How does this happen? String and Date both implement the Comparable interface. Comparable implementations provide a natural ordering for a class, which allows objects of that class to be sorted automatically. The following table summarizes some of the more important Java platform classes that implement Comparable.
Classes Implementing Comparable
ClassNatural Ordering
Byte
Signed numerical
Character
Unsigned numerical
Long
Signed numerical
Integer
Signed numerical
Short
Signed numerical
Double
Signed numerical
Float
Signed numerical
BigInteger
Signed numerical
BigDecimal
Signed numerical
Boolean
Boolean.FALSE < Boolean.TRUE
File
System-dependent lexicographic on path name
String
Lexicographic
Date
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1¡¢Dynamic Invocation Interface ( DII)
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1.н¨°ücom.qdl.server,±àд·þÎñ¶Ë³ÌÐòSayHello
package com.qdl.server;
public class SayHello
{
public String getName(String name)
{
return "hello "+name;
}
}

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