EN
Java - convert long to binary String with leading zeros
11 points
Short solution:
xxxxxxxxxx1
long number = 10_000_000_000L;2
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String binaryString = Long.toBinaryString(number);4
String withLeadingZeros = String.format("%64s", binaryString).replace(' ', '0');5
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// 10010101000000101111100100000000007
System.out.println(binaryString);8
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// 000000000000000000000000000000100101010000001011111001000000000010
System.out.println(withLeadingZeros);In java simples way to convert long to binary String with leading zeros is to use Long.toBinaryString(number) and String.format() method.
Note that as first param in String format we pass number of leading spaces and we replace all spaces with 0. Usually we use 32 or 64 padding zeros.
xxxxxxxxxx1
public class Example1 {2
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public static void main(String[] args) {4
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long number = 8;6
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String binary = Long.toBinaryString(number);8
String padding = String.format("%8s", binary).replace(' ', '0');9
String numberPadding = String.format("%4s", number);10
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System.out.println("long | binary");12
System.out.println(numberPadding + " - " + padding);13
}14
}Output:
xxxxxxxxxx1
long | binary2
8 - 00001000xxxxxxxxxx1
public class Example2 {2
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public static void main(String[] args) {4
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long number = 31L * Integer.MAX_VALUE;6
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String binary = Long.toBinaryString(number);8
String padding = String.format("%64s", binary).replace(' ', '0');9
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System.out.println("long:");11
System.out.println(number);12
System.out.println("binary (64 length padding):");13
System.out.println(padding);14
}15
}Output:
xxxxxxxxxx1
long:2
665719930573
binary (64 length padding):4
0000000000000000000000000000111101111111111111111111111111100001xxxxxxxxxx1
public class Example3 {2
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public static void main(String[] args) {4
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System.out.println("long | binary");6
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for (long i = 0; i <= 8; i++) {8
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String binary = Long.toBinaryString(i);10
String padding = String.format("%8s", binary).replace(' ', '0');11
String intPadding = String.format("%4s", i);12
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System.out.println(intPadding + " - " + padding);14
}15
}16
}Output:
xxxxxxxxxx1
long | binary2
0 - 000000003
1 - 000000014
2 - 000000105
3 - 000000116
4 - 000001007
5 - 000001018
6 - 000001109
7 - 0000011110
8 - 00001000