comparable

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showing results for - "comparable"

1class Student implements Comparable<Student>{  
2int rollno;  
3String name;  
4int age;  
5Student(int rollno,String name,int age){  
6this.rollno=rollno;  
7this.name=name;  
8this.age=age;  
9}  
10  
11public int compareTo(Student st){  
12if(age==st.age)  
13return 0;  
14else if(age>st.age)  
15return 1;  
16else  
17return -1;  
18}  
19}

1+------------------------------------------------------------------------------------+
2¦               Comparable                ¦                Comparator                ¦
3¦-----------------------------------------+------------------------------------------¦
4¦ java.lang.Comparable                    ¦ java.util.Comparator                     ¦
5¦-----------------------------------------+------------------------------------------¦
6¦ int objOne.compareTo(objTwo)            ¦ int compare(objOne, objTwo)              ¦
7¦-----------------------------------------+------------------------------------------¦
8¦ Negative, if objOne < objTwo            ¦ Same as Comparable                       ¦
9¦ Zero,  if objOne == objTwo              ¦                                          ¦
10¦ Positive,  if objOne > objTwo           ¦                                          ¦
11¦-----------------------------------------+------------------------------------------¦
12¦ You must modify the class whose         ¦ You build a class separate from to sort. ¦
13¦ instances you want to sort.             ¦ the class whose instances you want       ¦
14¦-----------------------------------------+------------------------------------------¦
15¦ Only one sort sequence can be created   ¦ Many sort sequences can be created       ¦
16¦-----------------------------------------+------------------------------------------¦
17¦ Implemented frequently in the API by:   ¦ Meant to be implemented to sort          ¦
18¦ String, Wrapper classes, Date, Calendar ¦ instances of third-party classes.        ¦
19+------------------------------------------------------------------------------------+
20

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