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Java - convert binary String to int

1 contributors

2 contributions

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5 points

Created by:

TheDalot

390

Short solution:

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String binaryString = "101";
int number = Integer.parseInt(binaryString, 2);
​
System.out.println(number); // 5

The best way to convert binary String to int in java is to use Integer.parseInt() method.

Syntax:

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Integer.parseInt(String binaryString, int radix)

1. Simple example

Edit

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public class Example1 {
​
    public static void main(String[] args) {
​
        String binaryString = "101";
        int number = Integer.parseInt(binaryString, 2);
        System.out.println(number); // 5
    }
}

Output:

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5

2. Convert couple of different binary strings to int

Edit

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public class Example2 {
​
    public static void main(String[] args) {
​
        System.out.println( Integer.parseInt("00000000", 2) ); // 0
        System.out.println( Integer.parseInt("00000101", 2) ); // 5
        System.out.println( Integer.parseInt("00001000", 2) ); // 8
        System.out.println( Integer.parseInt("00001100", 2) ); // 12
        System.out.println( Integer.parseInt("00010000", 2) ); // 16
        System.out.println( Integer.parseInt("11111111", 2) ); // 255
    }
}

Output:

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0
5
8
12
16
255

3. Convert binary string to int in loop - from 0 to 16

Edit

In this example we convert binary string to int in loop from 0 to 16 and then we print both binary and decimal representations of given number.

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public class Example3 {
​
    public static void main(String[] args) {
​
        for (int number = 0; number <= 16; number++) {
​
            String binaryString = Integer.toBinaryString(number);
​
            String format = String.format("%8s", binaryString);
            String withLeadingZeros = format.replace(' ', '0');
​
            int backToNumber = Integer.parseInt(binaryString, 2);
​
            System.out.println(withLeadingZeros + " - " + backToNumber);
        }
    }
}

Output:

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00000000 - 0
00000001 - 1
00000010 - 2
00000011 - 3
00000100 - 4
00000101 - 5
00000110 - 6
00000111 - 7
00001000 - 8
00001001 - 9
00001010 - 10
00001011 - 11
00001100 - 12
00001101 - 13
00001110 - 14
00001111 - 15
00010000 - 16

Show discussions ...

Java - convert binary String to int

1. Simple example

2. Convert couple of different binary strings to int

3. Convert binary string to int in loop - from 0 to 16

Java conversion

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