Java Example program convert Decimal to Binary

Posted by: Instanceofjava Posted date: March 21, 2016 / comment : 0

  • On of the way to convert decimal number to its binary representation using the Integer.toBinaryString() method. This method takes an integer as an argument and returns its binary representation as a string. Here is an example:
public static String decimalToBinary(int decimal) {
    return Integer.toBinaryString(decimal);
}

We can call this method and pass a decimal number as an argument, and it will return the binary representation of that number. For example:

int decimal = 10;
String binary = decimalToBinary(decimal);
System.out.println(binary); // Output: 1010

In the above method will return a string representation of the binary number, if we want to have it as an integer you can use Integer.parseInt(binary, 2) to convert it to an int.

Another way to convert a decimal number to its binary representation is by using bit shifting and bitwise operations. You can repeatedly divide the decimal number by 2 and keep track of the remainder. The remainder represents the least significant bit of the binary representation. You can then reverse the order of the remainders to get the binary representation of the decimal number.

In summary, In Java you can use the Integer.toBinaryString() method to convert a decimal number to its binary representation as a string, and you can use Integer.parseInt(binary, 2) to convert it to an int. Also, you can use bit shifting and bitwise operations to convert a decimal number to its binary representation.

Another way to convert a decimal number to its binary representation is by using bit shifting and bitwise operations. 
This method involves repeatedly dividing the decimal number by 2 and keeping track of the remainders. The remainders represent the least significant bits of the binary representation.


public static String decimalToBinaryUsingBitOperation(int decimal) {
    StringBuilder binary = new StringBuilder();
    while (decimal > 0) {
        binary.append(decimal % 2);
        decimal = decimal >> 1;
    }
    return binary.reverse().toString();
}

the function uses a while loop to divide the decimal number by 2 and keep track of the remainders. The remainders are appended to a StringBuilder object. The while loop continues until the decimal number is 0. At the end of the loop, the binary representation of the decimal number is obtained by reversing the order of the remainders using the reverse() method of the StringBuilder. The binary representation is then returned as a string.

This method will also work for negative decimal numbers, but the result will be the two's complement representation of the negative number, it will have a leading 1 in the most significant bit.

It's worth noting that, the above method will return the binary representation as a string, if you want to have it as an integer you can use Integer.parseInt(binary, 2) to convert it to an int.

In summary, there are different ways to convert a decimal number to its binary representation in Java. One way is to use the Integer.toBinaryString() method, another way is by using bit shifting and bitwise operations, this method uses a while loop to repeatedly divide the decimal number by 2 and keep track of the remainders, which represent the binary representation of the decimal number. The result can be returned as a string or as an integer by using the Integer.parseInt(binary, 2)

  • We can convert binary to decimal in three ways
    1.Using Integer.toBinaryString(int num);
    2.Using Stack
    3.Using Custom logic 


1.Write a Java Program to convert decimal to binary in java using Integer.toBinaryString(int num)

  1. import java.util.Scanner;
  2. public class ConvertDecimalToBinary{
  3.  
  4.     /**
  5.      *www.instanceofjava.com
  6.      */
  7.  
  8.  public static void main(String[] args) {
  9.         
  10.  System.out.println("\nBinary representation of 1: ");
  11.  System.out.println(Integer.toBinaryString(1));
  12.  System.out.println("\nBinary representation of 4: ");
  13.  System.out.println(Integer.toBinaryString(4));
  14.  System.out.println("Binary representation of 10: ");
  15.  System.out.println(Integer.toBinaryString(10));
  16.  System.out.println("\nBinary representation of 12: ");
  17.  System.out.println(Integer.toBinaryString(12));
  18.  System.out.println("\nBinary representation of 120: ");
  19.  System.out.println(Integer.toBinaryString(120));
  20.  System.out.println("\nBinary representation of 500: ");
  21.  System.out.println(Integer.toBinaryString(500));

  23. }
  24.  
  25. }





Output:

  1. Binary representation of 1: 
  2. 1
  3. Binary representation of 4: 
  4. 100
  5. Binary representation of 10: 
  6. 1010
  7. Binary representation of 12: 
  8. 1100
  9. Binary representation of 120: 
  10. 1111000
  11. Binary representation of 500: 
  12. 111110100

2.Write a Java Program to convert decimal to binary in java


  1. import java.util.Scanner;
  2. import java.util.Stack;
  3. public class ConvertDecimalToBinary{
  4.  
  5.     /**
  6.      *www.instanceofjava.com
  7.      */
  8.  
  9.  
  10.  public static void main(String[] args) {
  11.         
  12. Scanner in = new Scanner(System.in);
  13.          
  14. // Create Stack object
  15. Stack<Integer> stack = new Stack<Integer>();
  16.      
  17. //Take  User input from keyboard
  18.  System.out.println("Enter decimal number: ");
  19.  int num = in.nextInt();
  20.     
  21. while (num != 0)
  22. {
  23.    int d = num % 2;
  24.    stack.push(d);
  25.    num /= 2;
  26.  
  27.  } 
  28.      
  29.  System.out.print("\nBinary representation is:");
  30.  
  31. while (!(stack.isEmpty() ))
  32.  {
  33.    System.out.print(stack.pop());
  34.  }
  35.         
  36.  
  37. System.out.println();
  38.  
  39. }
  40.  
  41. }
  42.  
  43. }


Output:

  1. Enter decimal number: 
  2. 12
  3.  
  4. Binary representation is:1100

java program convert decimal to binary


3.Write a Java Program to convert decimal to binary in java


  1. import java.util.Scanner;
  2. public class ConvertDecimalToBinary{
  3.  
  4.     /**
  5.      *www.instanceofjava.com
  6.      */
  7.  
  8. public static void convertDeciamlToBinary(int num){
  9.  
  10.   int binary[] = new int[40];
  11.          int index = 0;
  12.  while(num > 0){
  13.            binary[index++] = num%2;
  14.            num = num/2;
  15.  }

  17. for(int i = index-1;i >= 0;i--){
  18.            System.out.print(binary[i]);
  19. }
  20.  
  21. }
  22.  
  23.  public static void main(String[] args) {
  24.         
  25. System.out.println("Binary representation of 1: ");
  26. convertDeciamlToBinary(1);
  27.  
  28. System.out.println("\nBinary representation of 4: ");
  29. convertDeciamlToBinary(4);
  30.  
  31. System.out.println("\nBinary representation of 10: ");
  32. convertDeciamlToBinary(10);
  33.  
  34. System.out.println("\nBinary representation of 12: ");
  35.  convertDeciamlToBinary(12);
  36.  
  37. }
  38.  
  39. }


Output:

  1. Binary representation of 1: 
  2. 1
  3. Binary representation of 4: 
  4. 100
  5. Binary representation of 10: 
  6. 1010
  7. Binary representation of 12: 
  8. 1100

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Java Example Program to convert binary to decimal

Posted by: Instanceofjava Posted date: March 21, 2016 / comment : 2


  • Famous interview java question on conversions . 
  • We can convert binary to decimal in two ways
    1.Using Integer.parseInt() method
    2.Using custom logic



1.Write a Java Program to convert binary to decimal number in java without using Integer.parseInt() method.

  1. import java.util.Scanner;
  2. public class DecimalFromBinary {
  3.  
  4.     /**
  5.      *www.instanceofjava.com
  6.      */
  7.  
  8.  public static void main(String[] args) {
  9.         
  10.  Scanner in = new Scanner( System.in );
  11.  System.out.println("Enter a binary number: ");
  12.  
  13.   int  binarynum =in.nextInt();
  14.   int binary=binarynum;
  15.         
  16. int decimal = 0;
  17. int power = 0;
  18.  
  19. while(true){
  20.  
  21.  if(binary == 0){
  22.  
  23.         break;
  24.  
  25.  } else {
  26.  
  27.    int tmp = binary%10;
  28.    decimal += tmp*Math.pow(2, power);
  29.    binary = binary/10;
  30.    power++;
  31.  
  32.  }
  33. }
  34.         System.out.println("Binary="+binary+" Decimal="+decimal); ;
  35. }
  36.  
  37. }

Output:


  1. Enter a binary number: 
  2. 101
  3. Binary=101 Decimal=5




2.Write a Java Program to convert binary to decimal number in java using Integer.parseInt() method.



  1. import java.util.Scanner;
  2. public class ConvertBinaryToDecimal{
  3.  
  4.     /**
  5.      *www.instanceofjava.com
  6.      */
  7.  
  8.  public static void main(String[] args) {
  9.         
  10.  Scanner in = new Scanner( System.in );
  11.  
  12.  System.out.println("Enter a binary number: ");
  13.  String binaryString =input.nextLine();
  14.  
  15.  System.out.println("Result: "+Integer.parseInt(binaryString,2));

  17.  
  18. }
  19.  
  20. }


Output:


  1. Enter a binary number:
  2. 001
  3. Result: 1

java program to convert binary to decimal


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Get collection values from hashtable example

Posted by: Instanceofjava Posted date: March 17, 2016 / comment : 0 ,

1.Basic java collection framework example program to get Value collection from hashtable

  •   Collection values()   This method used to get collection of values
  •  Important note is that if any value is removed from set the original hashtable key also removed
  1. package com.setviewHashtable;
  2.  
  3. import java.util.Hashtable;

  5. import java.util.Enumeration;
  6. import java.util.Iterator;
  7. import java.util.Set;
  8.  
  9. public class HashtableExample{
  10.  
  11. public static void main(String[] args) {
  12.   
  13.  //create Hashtable object
  14.        Hashtable<String,String> hashtable = new Hashtable<String,String>();
  15.        
  16. //add key value pairs to Hashtable
  17. hashtable.put("1","Java Interview Questions");
  18. hashtable.put("2","Java Interview Programs");
  19. hashtable.put("3","Concept and example program");
  20. hashtable.put("4","Concept and interview Questions");
  21. hashtable.put("5","Java Quiz");
  22. hashtable.put("6","Real time examples");
  23.  
  24.  
  25.  Collection c = hashtable.values();
  26.  System.out.println("Values of Collection created from Hashtable are :");
  27. //iterate through the Set of keys
  28.  
  29.  Iterator itr = c.iterator();
  30.  while(itr.hasNext())
  31.  System.out.println(itr.next());
  32.            
  33.  c.remove("Java Quiz");
  34.            
  35. System.out.println("Elements in hash table");
  36. Enumeration e=hashtable.elements();
  37.         
  38.  
  39.  while (e.hasMoreElements()) {
  40.         System.out.println(e.nextElement());
  41. }    

  43. }
  44.  
  45. }
     



Output:

  1. Values of Collection created from Hashtable are :
  2. Real time examples
  3. Java Quiz
  4. Concept and interview Questions
  5. Concept and example program
  6. Java Interview Programs
  7. Java Interview Questions
  8. Elements in hash table
  9. Real time examples
  10. Concept and interview Questions
  11. Concept and example program
  12. Java Interview Programs
  13. Java Interview Questions


Java Collections example program Get Set view of Keys from Hashtable example

Posted by: Instanceofjava Posted date: March 17, 2016 / comment : 0 ,

1.Basic java collection framework example program to get set view from hashtable

  • Set keySet()   This method used to get set view of the keys of hashtable
  •  Important note is that if any key is removed from set the original hashtable key also removed
  1. package com.setviewHashtable;
  2.  
  3. import java.util.Hashtable;

  5. import java.util.Enumeration;
  6. import java.util.Iterator;
  7. import java.util.Set;
  8.  
  9. public class HashtableExample{
  10.  
  11. public static void main(String[] args) {
  12.   
  13.  //create Hashtable object
  14.        Hashtable<String,String> hashtable = new Hashtable<String,String>();
  15.        
  16. //add key value pairs to Hashtable
  17. hashtable.put("1","Java Interview Questions");
  18. hashtable.put("2","Java Interview Programs");
  19. hashtable.put("3","Concept and example program");
  20. hashtable.put("4","Concept and interview Questions");
  21. hashtable.put("5","Java Quiz");
  22. hashtable.put("6","Real time examples");
  23.  
  24.  
  25.  Set st = hashtable.keySet();       
  26.  System.out.println("Set created from Hashtable Keys contains :");
  27. //iterate through the Set of keys
  28.  
  29.  Iterator itr = st.iterator();
  30.  while(itr.hasNext())
  31.  System.out.println(itr.next());
  32.            
  33.  st.remove("1");
  34.            
  35. System.out.println("Elements in hash table");
  36. Enumeration e=hashtable.keys();
  37.         
  38.  
  39.  while (e.hasMoreElements()) {
  40.         System.out.println(e.nextElement());
  41. }    

  43. }
  44.  
  45. }
     



Output:

  1. Set created from Hashtable Keys contains :
  2. 6
  3. 5
  4. 4
  5. 3
  6. 2
  7. 1
  8. Elements in hash table
  9. 6
  10. 5
  11. 4
  12. 3
  13. 2

Java collections interview programming questions

Posted by: Instanceofjava Posted date: March 16, 2016 / comment : 0

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Remove all elements from hashtable java example

Posted by: Instanceofjava Posted date: March 16, 2016 / comment : 0 ,

1.Basic java example program to remove all elements from hashtable
  • Object remove(Object key)    This method used to remove value pair from hashtable
  • void clear() this method removes all elements from hashtable
  •  
  1. package com.removevalueHashtable;
  2.  
  3. import java.util.Hashtable;

  5. import java.util.Enumeration;
  6.  
  7. public class HashtableExample{
  8.  
  9. public static void main(String[] args) {
  10.   
  11.  //create Hashtable object
  12.        Hashtable<String,String> hashtable = new Hashtable<String,String>();
  13.        
  14. //add key value pairs to Hashtable
  15. hashtable.put("1","Java Interview Questions");
  16. hashtable.put("2","Java Interview Programs");
  17. hashtable.put("3","Concept and example program");
  18. hashtable.put("4","Concept and interview Questions");
  19. hashtable.put("5","Java Quiz");
  20. hashtable.put("6","Real time examples");
  21.  
  22. Object obj = ht.remove("2");
  23. System.out.println(obj + " Removed from Hashtable");
  24.  
  25. Enumeration e=hashtable.elements();
  26.           
  27.  
  28.  while (e.hasMoreElements()) {
  29.         System.out.println(e.nextElement());
  30. }    
  31. hashtable.clear();
  32.  
  33.  System.out.println("Total key value pairs in Hashtable are : " + hashtable.size());

  35. }
  36.  
  37. }
     



Output:

  1. Java Interview Programs Removed from Hashtable
  2. Real time examples
  3. Java Quiz
  4. Concept and interview Questions
  5. Concept and exampe program
  6. Java Interview Questions
  7. Total key value pairs in Hashtable are : 0

Remove key value pair from hashtable java example

Posted by: Instanceofjava Posted date: March 16, 2016 / comment : 0 ,

1.Basic java example program to iterate keys of hashtable
  • Object remove(Object key)    This method used to remove value pair from hashtable
  1. package com.removevalueHashtable;
  2.  
  3. import java.util.Hashtable;

  5. import java.util.Enumeration;
  6.  
  7. public class HashtableExample{
  8.  
  9. public static void main(String[] args) {
  10.   
  11.  //create Hashtable object
  12.        Hashtable<String,String> hashtable = new Hashtable<String,String>();
  13.        
  14. //add key value pairs to Hashtable
  15. hashtable.put("1","Java Interview Questions");
  16. hashtable.put("2","Java Interview Programs");
  17. hashtable.put("3","Concept and example program");
  18. hashtable.put("4","Concept and interview Questions");
  19. hashtable.put("5","Java Quiz");
  20. hashtable.put("6","Real time examples");
  21.  
  22. Object obj = ht.remove("2");
  23. System.out.println(obj + " Removed from Hashtable");
  24.  
  25. Enumeration e=hashtable.elements();
  26.           
  27.  
  28.            
  29. // display search result
  30.  while (e.hasMoreElements()) {
  31.         System.out.println(e.nextElement());
  32. }    

  34. }
  35.  
  36. }
     



Output:

  1. Java Interview Programs Removed from Hashtable
  2. Real time examples
  3. Java Quiz
  4. Concept and interview Questions
  5. Concept and exampe program
  6. Java Interview Questions
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