Package java.lang
Class Integer
static String toBinaryString(int i)
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Description:
Creates a string representation of the integer argument as an unsigned integer in base 2. The unsigned integer value is the argument plus 232 if the argument is negative; otherwise it is equal to the argument. This value is converted to a string of ASCII digits in binary (base 2) with no extra leading 0s. If the unsigned magnitude is zero, it is represented by a single zero character '0' ('\u0030'); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The characters '0' ('\u0030') and '1' ('\u0031') are used as binary digits.
Example
String toSt = Integer.toBinaryString(10);
The toBinaryString() method returns the binary String representation of the decimal value 10.