comparable interfacee
class Student implements Comparable<Student>{
int rollno;
String name;
int age;
Student(int rollno,String name,int age){
this.rollno=rollno;
this.name=name;
this.age=age;
}
public int compareTo(Student st){
if(age==st.age)
return 0;
else if(age>st.age)
return 1;
else
return -1;
}
}comparable
+------------------------------------------------------------------------------------+
¦ Comparable ¦ Comparator ¦
¦-----------------------------------------+------------------------------------------¦
¦ java.lang.Comparable ¦ java.util.Comparator ¦
¦-----------------------------------------+------------------------------------------¦
¦ int objOne.compareTo(objTwo) ¦ int compare(objOne, objTwo) ¦
¦-----------------------------------------+------------------------------------------¦
¦ Negative, if objOne < objTwo ¦ Same as Comparable ¦
¦ Zero, if objOne == objTwo ¦ ¦
¦ Positive, if objOne > objTwo ¦ ¦
¦-----------------------------------------+------------------------------------------¦
¦ You must modify the class whose ¦ You build a class separate from to sort. ¦
¦ instances you want to sort. ¦ the class whose instances you want ¦
¦-----------------------------------------+------------------------------------------¦
¦ Only one sort sequence can be created ¦ Many sort sequences can be created ¦
¦-----------------------------------------+------------------------------------------¦
¦ Implemented frequently in the API by: ¦ Meant to be implemented to sort ¦
¦ String, Wrapper classes, Date, Calendar ¦ instances of third-party classes. ¦
+------------------------------------------------------------------------------------+Copyright © 2021 Codeinu
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