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Saturday, October 29, 2016

Perform Exception in Employee class through Generics and by using an ArrayList.

Write a program that perform exception by programming the Employee class through Generics and by using an ArrayList.

Program / Input:

myException Class:
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public class myException extends Exception {

    myException(String s) {
        super(s);
    }
}

Generic Class:
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package Generic_or_ExceptionHandling;

import java.util.Comparator;

public class Generic_class<u, v> implements Comparator<Generic_class>, Comparable<Generic_class> {

    private u id;
    private v name;

    public Generic_class() {
    }

    public Generic_class(u id, v num) {
        this.id = id;
        this.name = num;
    }

    public u getId() {
        return id;
    }

    public void setId(u id) {
        this.id = id;
    }

    public v getNum() {
        return name;
    }

    public void setNum(v num) {
        this.name = num;
    }

    @Override
    //implements by Comparator<Generic_class>
    public int compare(Generic_class o1, Generic_class o2) {
        int a1 = (int) o1.id;
        int a2 = (int) o2.id;
        return a1 - a2;
    }

    // implements Comparable<Generic_class>
    @Override
    public int compareTo(Generic_class o) {
        String a1 = this.name.toString();
        String a2 = o.getNum().toString();
        int i = a1.compareTo(a2);
        return i;
    }
    
    public void checkType() throws myException {
    Boolean b = id instanceof Integer;
        if (b) {
            System.out.println("true!!! its string");
        } else {
            throw new myException("Its not String");
        }
    }
}

Test Class:
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package Generic_or_ExceptionHandling;

import java.util.ArrayList;
import java.util.Collections;

public class test {

    public static void main(String[] args) throws myException {
        ArrayList<Generic_class<Integer, String>> arr = new ArrayList<>();
//        Generic_class<Integer, String> gc0 = new Generic_class<>(2, "Ahmed");
//        Generic_class<Integer, String> gc1 = new Generic_class<>(5, "Nida");
//        Generic_class<Integer, String> gc2 = new Generic_class<>(1, "Maria");
//        Generic_class<Integer, String> gc3 = new Generic_class<>(3, "Anaya");
//        Generic_class<Integer, String> gc4 = new Generic_class<>(4, "Ali");

        arr.add(new Generic_class<>(2, "Ahmed"));
        arr.add(new Generic_class<>(5, "Nida"));
        arr.add(new Generic_class<>(1, "Maria"));
        arr.add(new Generic_class<>(3, "Anaya"));
        arr.add(new Generic_class<>(4, "Ali"));

        // compareTo
        Collections.sort(arr);
        System.out.println("Name \t ID");
        for (int i = 0; i < arr.size(); i++) {
            System.out.println(arr.get(i).getNum() + "   " + arr.get(i).getId());
        }
        System.out.println();
        System.out.println();

        // compare()
        Collections.sort(arr, new Generic_class());
        for (int i = 0; i < arr.size(); i++) {
            System.out.println(arr.get(i).getNum() + "   " + arr.get(i).getId());
        }

        System.out.println("Check its generic class or not???");
        Generic_class g = new Generic_class(1, "1");
        g.checkType();

//        Generic_class obj = new Generic_class("sada", 44);
//       // ArrayList<Generic_class<String, Integer>> aw = new ArrayList<>();
//        try {
//            obj.CheckType1();
//        } catch (Exception e) {
//            System.out.println(e.getMessage());
//
//        }
    }
}

Result/Run:
Name   ID
Ahmed   2
Ali   4
Anaya   3
Maria   1
Nida   5


Maria   1
Ahmed   2
Anaya   3
Ali   4
Nida   5
Check its generic class or not???
true!!! its string

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