java ±È½ÏÆ÷µÄʹÓÃ
¶ÔÓÚÒ»¸öʵÏÖÁËComparable½Ó¿ÚµÄ¶ÔÏ󣬸ýӿÚÖ»ÄÜʵÏÖÒ»´Î¡£Èç¹ûÔÚÒ»¸ö¼¯ºÏÀïÃæÐèҪʹÓÃidÅÅÐò£¬¶øÔÚÁíÍâÒ»¸ö¼¯ºÏÀïÐèÒª°´Ãû×ÖÅÅÐòÕâʱ¾ÍÐèÒªÔÚÕâ¸ö¼¯ºÏÀïÃæÖ¸¶¨±È½ÏÆ÷¡£
Comparable½Ó¿ÚÉùÃ÷ÁËcompareTo(Object o)·½·¨
Comparator ½Ó¿ÚÉùÃ÷ÁËcompare(Object o1,Object o2)·½·¨
eg:
µÚÒ»¸öÊ÷¼¯ÊÇ°´ÕÕ¶ÔÏóĬÈϵÄidÅÅÐò£¬µÚ¶þ¸öÊ÷¼¯ÓÉÖ¸¶¨µÄ¹¹ÔìÆ÷°´ÕÕname ÅÅÐò
public class Employee implements Comparable<Employee>{
private int id;
private String name;
public Employee(int id, String name){
this.id = id;
this.name = name;
}
public boolean equals(Object o){
if (o == null ){
return false;
}
if (this == o){
return true;
}
if(!(o instanceof Employee)){
return false;
}
Employee employee = (Employee)o;
return (this.id == employee.id) && (this.name.equals(employee.name));
}
public int hashCode(){
int result = 17;
result = 37 * result + id;
result = 37 * result + name.hashCode();
return result;
}
public String toString(){
return "id:"+id+",name:"+name+"";
}
public int compareTo(Employee employee){
//ÉýÐò
return this.id - employee.id;
//½µÐò
//return employee.id - this.id;
}
public String getName() {
return name;
}
}
/*******************************************************************/
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.Comparator;
public class TreeSetTest {
public static void main(String []args){
//ʹÓõÄÊÇʵÏÖÁËCompable ½Ó¿Ú¶ÔÏóĬÈϵÄÅÅÐò·½Ê½£¬°´idÉýÐòÅÅÐò
SortedSet<Employee> treeSet = new TreeSet&
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import java.sql.*;
/*
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*
* */
public class JDBC {
public static void main(String[] args)throws Exception {
Connection conn=null;
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int a=1;byte b=2;short c=3;float d=3;double e=4;char f='a';boolean g=true;long l=10;
c=b;
a=f;
d=a;
e=d;
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