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# Java - convert hex to long

1 points
Created by:
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Short solution:

``````String hex = "4a817c8f600";
long number = Long.parseLong(hex, 16);

System.out.println(number); // 5120000062976``````

The best way to convert hex String to long in java is to use Long.parseLong() method.

Syntax:

``Long.parseLong(String hexString, int radix)``

## 1. Convert couple of different hex to long

``````public class Example1 {

public static void main(String[] args) {

System.out.println( Long.parseLong("5", 16) );  // 5
System.out.println( Long.parseLong("a", 16) );  // 10
System.out.println( Long.parseLong("b", 16) );  // 11
System.out.println( Long.parseLong("f", 16) );  // 15
System.out.println( Long.parseLong("10", 16) ); // 16
System.out.println( Long.parseLong("1f", 16) ); // 31
System.out.println( Long.parseLong("20", 16) ); // 32
System.out.println( Long.parseLong("21", 16) ); // 33

// 3002399751580330
System.out.println( Long.parseLong("aaaaaaaaaaaaa", 16) );
}
}``````

Output:

``````5
10
11
15
16
31
32
33
3002399751580330``````

## 2. Convert hex to long in for loop

``````public class Example2 {

public static void main(String[] args) {

System.out.println("           Hex -  Dec");

long number = 10_000_000_123L;
for (int i = 0; i < 10; i++) {

String hex = Long.toHexString(number);
long backToLong = Long.parseLong(hex, 16);

System.out.println(String.format("%14s", hex) + " - "
+ String.format("%14s", backToLong));

number *= 2;
}
}
}``````

Output:

``````         Hex -  Dec
2540be47b -  10000000123
4a817c8f6 -  20000000246
9502f91ec -  40000000492
12a05f23d8 -  80000000984
2540be47b0 - 160000001968
4a817c8f60 - 320000003936
9502f91ec0 - 640000007872
12a05f23d80 - 1280000015744
2540be47b00 - 2560000031488
4a817c8f600 - 5120000062976``````

## Java conversion

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