java program to convert decimal to binary using tobinarystring and stack

1public class DecimalToBinaryExample2{    
2public static void toBinary(int decimal){    
3     int binary[] = new int[40];    
4     int index = 0;    
5     while(decimal > 0){    
6       binary[index++] = decimal%2;    
7       decimal = decimal/2;    
8     }    
9     for(int i = index-1;i >= 0;i--){    
10       System.out.print(binary[i]);    
11     }    
12System.out.println();//new line  
13}    
14public static void main(String args[]){      
15System.out.println("Decimal of 10 is: ");  
16toBinary(10);    
17System.out.println("Decimal of 21 is: ");  
18toBinary(21);    
19System.out.println("Decimal of 31 is: ");    
20toBinary(31);  
21}}    

1Convert decimal to binary using toBinaryString() method
2public class DecimalToBinary
3{
4   public static void main(String[] args)
5   {
6      System.out.println("decimal to binary using toBinaryString() 104: ");
7      // to binary string java
8      System.out.println(Integer.toBinaryString(104));
9      System.out.println("\ndecimal to binary using toBinaryString() 554: ");
10      // tobinarystring
11      System.out.println(Integer.toBinaryString(554));
12      System.out.println("\ndecimal to binary using toBinaryString() 644: ");
13      System.out.println(Integer.toBinaryString(644));
14   }
15}

1Convert decimal to binary using stack in java
2import java.util.*;
3public class DecimalBinaryExample
4{
5   public static void main(String[] args)
6   {
7      Scanner sc = new Scanner(System.in);                
8      Stack<Integer> numStack = new Stack<Integer>();     
9      System.out.println("Please enter a decimal number : ");
10      int number = sc.nextInt();
11      while(number != 0)
12      {
13         int a = number % 2;
14         numStack.push(a);
15         number /= 2;
16      }
17      System.out.println("Binary number : ");
18      while(!(numStack.isEmpty()))
19      {
20         System.out.print(numStack.pop());
21      }
22      System.out.println();
23      sc.close();
24   }
25}