BufferedReader - Long - JAVA

 import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class BuffReadLong {

    public static void main(String[] args)throws IOException {

        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

        System.out.println("Enter an long value");

        String s=br.readLine();

        long n=Long.parseLong(s);

        System.out.println(n);

    }

}

BufferedReader - Interger - JAVA

 import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class BuffReadInt {

    public static void main(String[] args)throws IOException {

        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

        System.out.println("Enter an integer value");

        String s=br.readLine();

        int n=Integer.parseInt(s);

        System.out.println(n);

    }

}

BufferedReader-Float-JAVA

 import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class BuffReadFloat {

    public static void main(String[] args)throws IOException {

        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

        System.out.println("Enter an float value");

        String s=br.readLine();

        float n=Float.parseFloat(s);

        System.out.println(n);

    }

}

BufferedReader-Double-JAVA

 import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class BuffReadDouble {

    public static void main(String[] args)throws IOException {

        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

        System.out.println("Enter an double value");

        String s=br.readLine();

        double n=Double.parseDouble(s);

        System.out.println(n);

    }

}

BufferedReader - Character - JAVA

 

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class BuffReadChar {

    public static void main(String[] args)throws IOException {

        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

        System.out.println("Enter an character value");

        char ch=(char)br.read();

        System.out.println(ch);

    }

}

Binary to Decimal - JAVA

 

import java.util.Scanner;

public class BinaryToDecimal {

    public static void main(String[] args) {

        int i=1,rev=0,r;

        int m,n;

        Scanner sc=new Scanner(System.in);

        System.out.println("Enter n: ");

        n=sc.nextInt();

        m=n;

        while (m>0)

        {

            r=m%2;

            rev=rev+i*r;

            m=m/2;

            i=i*10;

        }

        System.out.println("Binary = "+rev);

    }

}

Area Calculation Using Function Overloading in java

 

class ShapesArea

{

    void area(double r)

    {

        System.out.println(Math.PI*Math.pow(r, 2));//circle

    }

    void area(int a)

    {

        System.out.println(Math.pow(a, 2));//square

    }

    void area(int x,int y)

    {

        System.out.println(x*y);//rectangle

    }

    void area(int p,int q,int r)

    {

        double s = (p+q+r)/2;

        System.out.println(Math.sqrt(s*(s-p)*(s-q)*(s-r)));

    }

}

public class AreaCalculate {

    public static void main(String[] args) {

        ShapesArea ob=new ShapesArea();

        ob.area(9.5);

        ob.area(6);

        ob.area(3, 4);

        ob.area(7, 8, 9);

    }

}