How to sort a TreeSet with user
defined objects
package com.java2novice.treeset;
import java.util.Comparator;
import java.util.TreeSet;
public class MyCompUserDefine
{
public static void main(String a[])
{
TreeSet
nameComp = new TreeSet(new MyNameComp());
nameComp.add(new
Empl("Ram",3000));
nameComp.add(new
Empl("John",6000));
nameComp.add(new
Empl("Crish",2000));
nameComp.add(new
Empl("Tom",2400));
for(Empl
e:nameComp)
{
System.out.println(e);
}
System.out.println("===========================");
TreeSet
salComp = new TreeSet(new MySalaryComp());
salComp.add(new
Empl("Ram",3000));
salComp.add(new
Empl("John",6000));
salComp.add(new
Empl("Crish",2000));
salComp.add(new
Empl("Tom",2400));
for(Empl
e:salComp)
{
System.out.println(e);
}
}
}
class MyNameComp implements
Comparator
{
public int compare(Empl e1, Empl e2)
{
return
e1.getName().compareTo(e2.getName());
}
}
class MySalaryComp implements
Comparator
{
public int
compare(Empl e1, Empl e2)
{
if(e1.getSalary()
> e2.getSalary())
{
return
1;
}
else
{
return
-1;
}
}
}
class Empl
{
private String name;
private int salary;
public Empl(String n, int s)
{
this.name
= n;
this.salary
= s;
}
public String getName()
{
return
name;
}
public void
setName(String name)
{
this.name
= name;
}
public int getSalary()
{
return
salary;
}
public void setSalary(int salary)
{
this.salary
= salary;
}
public String toString()
{
return
"Name: "+this.name+"-- Salary: "+this.salary;
}
}
How to get subset from sorted set
package com.java2novice.treeset;
import java.util.Comparator;
import java.util.Set;
import java.util.TreeSet;
public class MySetSublist
{
public static void main(String a[])
{
TreeSet
ts = new TreeSet(new MyStrComp());
ts.add("Red");
ts.add("Orange");
ts.add("Blue");
ts.add("Green");
ts.add("White");
ts.add("Brown");
ts.add("Yellow");
ts.add("Black");
System.out.println(ts);
Set
subSet = ts.subSet("Green", "White");
System.out.println("sub
set: "+subSet);
subSet
= ts.subSet("Green", true, "White", true);
System.out.println("sub
set: "+subSet);
subSet
= ts.subSet("Green", false, "White", true);
System.out.println("sub
set: "+subSet);
}
}
class MyStrComp implements Comparator
{
public int compare(String str1,
String str2)
{
return str1.compareTo(str2);
}
}
How to get least value element
from a set
package com.java2novice.treeset;
import java.util.Comparator;
import java.util.TreeSet;
public class MyLeastElementInSet
{
public static void main(String a[])
{
TreeSet
salComp = new TreeSet(new MySalCompr());
salComp.add(new
Empl1("Ram",3000));
salComp.add(new
Empl1("John",6000));
salComp.add(new
Empl1("Crish",2000));
salComp.add(new
Empl1("Tom",2400));
System.out.println("Least
salary emp: "+salComp.first());
}
}
class MySalCompr
implements Comparator
{
public int compare(Empl1 e1, Empl1 e2)
{
if(e1.getSalary()
> e2.getSalary())
{
return
1;
}
else
{
return
-1;
}
}
}
class Empl1
{
private String name;
private int
salary;
public Empl1(String n, int s)
{
this.name
= n;
this.salary
= s;
}
public String getName()
{
return
name;
}
public void setName(String name)
{
this.name
= name;
}
public int getSalary()
{
return
salary;
}
public void setSalary(int
salary)
{
this.salary
= salary;
}
public String toString()
{
return
"Name: "+this.name+"-- Salary: "+this.salary;
}
}
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