Question

How to convert converts a base 10 integer to base 2 String in Java

Answer 1

package javaapplication1;

public class JavaApplication1 {
  
    public static void main(String[] args) {
         
        for (int i = -3; i < 11; i++) 
               System.out.println(i + ": " + toBinary(i));
    }

    public static String toBinary(int n) {
        boolean negative = n < 0;
        n = Math.abs(n);        
        String binary = "";

        while(n > 1) {
            binary = (n % 2) + binary;
            n /= 2;
        }
        binary = n + binary;
        if (negative)
            binary = "-" + binary;
        
        return binary;
    }
}
    
/*
run:
   
-3: -11
-2: -10
-1: -1
0: 0
1: 1
2: 10
3: 11
4: 100
5: 101
6: 110
7: 111
8: 1000
9: 1001
10: 1010
    
*/

 

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Answer 2

package javaapplication1;

public class JavaApplication1 {
  
    public static void main(String[] args) {
         
        for (int i = -3; i < 11; i++) 
              System.out.println(i + ": " + Integer.toBinaryString(i));
    }
}
    
/*
run:
   
-3: 11111111111111111111111111111101
-2: 11111111111111111111111111111110
-1: 11111111111111111111111111111111
0: 0
1: 1
2: 10
3: 11
4: 100
5: 101
6: 110
7: 111
8: 1000
9: 1001
10: 1010
    
*/

 

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