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Answer to Question #4606 in Java | JSP | JSF for bob

Question #4606
Design and implement a class called DecToBinArray and write a test program called DecToBinArrayTest.

DecToBinArray is utility class that converts a nonnegative decimal number between 0 and 255 into an array of 0's and 1's. For example, you should be able to do the following:
DecToBinArray arr = new DecToBinArray(120);

DecToBinArrayTest should also implement toString() method properly so that the above code snippet print out the standard output 01111000.
NOTE: that the length of the array used in DecToBinArray is always 8 since integers from 0 to 255 can be represented with 8 bits.

DecToBinArrayTest reads a string of digits representing a nonnegative integer from 0 to 255. you may read a line of text from the standard in using the following:

BufferedReader in = new BufferedReader(new InputStreamReader(System.in))
Expert's answer

public class DecToBinArray {

private int n;

public DecToBinArray(int n){

if ((n<0) || (n>255)) throw new IllegalArgumentException("Number shold be [0;255]");

this.n = n;


public char[] convert(){

int size = 8;

char [] res = new char[size];

String tmp = Integer.toBinaryString(n);

int i = 0;

for(; i < tmp.length(); i++){

res[size-1-i] = tmp.charAt(tmp.length()-1-i);


while(i < size){

res[size-1-i] = '0';



return res;



public String toString(){

String tmp = Integer.toBinaryString(n);

while(tmp.length() != 8){

tmp = '0' + tmp;


return Integer.toBinaryString(n);



public class NewEmptyJUnitTest {

public void test() {

Scanner keyboard = new Scanner(System.in);

System.out.print("Input value: ");

int c = keyboard.nextInt();

DecToBinArray ar = new DecToBinArray(c);


System.out.print("Test passed");

} else {

System.out.print("Test failed");




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