biginteger

How to convert BigInteger to String in java

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You want to use BigInteger.toByteArray() String msg = “Hello there!”; BigInteger bi = new BigInteger(msg.getBytes()); System.out.println(new String(bi.toByteArray())); // prints “Hello there!” The way I understand it is that you’re doing the following transformations: String —————–> byte[] ——————> BigInteger String.getBytes() BigInteger(byte[]) And you want the reverse: BigInteger ————————> byte[] ——————> String BigInteger.toByteArray() String(byte[]) Note that you … Read more

java.math.BigInteger cannot be cast to java.lang.Long

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Better option is use SQLQuery#addScalar than casting to Long or BigDecimal. Here is modified query that returns count column as Long Query query = session .createSQLQuery(“SELECT COUNT(*) as count FROM SpyPath WHERE DATE(time)>=DATE_SUB(CURDATE(),INTERVAL 6 DAY) GROUP BY DATE(time) ORDER BY time;”) .addScalar(“count”, LongType.INSTANCE); Then List<Long> result = query.list(); //No ClassCastException here Related link Hibernate javadocs … Read more

Unsigned long in Java

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In Java 8, unsigned long support was introduced. Still, these are typical longs, but the sign doesn’t affect adding and subtracting. For dividing and comparing, you have dedicated methods in Long. Also, you can do the following: long l1 = Long.parseUnsignedLong(“12345678901234567890”); String l1Str = Long.toUnsignedString(l1) BigInteger is a bit different. It can keep huge numbers. … Read more

How to convert strings to bigInt in JavaScript

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BigInt is now a native JavaScript language feature. It’s at Stage 3 in the TC39 process and it’s shipping in V8 v6.7 and Chrome 67. To turn a string containing a valid numeric literal into a BigInt, use the global BigInt function: const string = ‘78099864177253771992779766288266836166272662’; BigInt(string); // 78099864177253771992779766288266836166272662n If you just want to hardcode … Read more

How does BigInteger store its data?

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With an int[] From the source: /** * The magnitude of this BigInteger, in <i>big-endian</i> order: the * zeroth element of this array is the most-significant int of the * magnitude. The magnitude must be “minimal” in that the most-significant * int ({@code mag[0]}) must be non-zero. This is necessary to * ensure that there … Read more