Java Language
- Getting started with Java Language
- Top 10 Java Errors with Solutions
- Awesome Book
- Awesome Community
- Awesome Course
- Awesome Tutorial
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- 2D Graphics in Java
- Alternative Collections
- Annotations
- Apache Commons Lang
- AppDynamics and TIBCO BusinessWorks Instrumentation for Easy Integration
- Applets
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- Asserting
- Atomic Types
- Audio
- Autoboxing
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- Class - Java Reflection
- Classes and Objects
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- Date Class
- Dates and Time (java.time.*)
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- Enum starting with number
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- EnumSet class
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- FileUpload to AWS
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- Java Pitfalls - Exception usage
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- Java Pitfalls - Nulls and NullPointerException
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- Logging (java.util.logging)
- Maps
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- Nashorn JavaScript engine
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- Object Cloning
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- Optional
- Oracle Official Code Standard
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- Properties Class
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- Random Number Generation
- Generating cryptographically secure pseudorandom numbers
- Generating Random number using apache-common lang3
- Generating Random Numbers with a Specified Seed
- Pseudo Random Numbers
- Pseudo Random Numbers in Specific Range
- Select random numbers without duplicates
- Readers and Writers
- Recursion
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- Reflection API
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- Security & Cryptography
- Security & Cryptography
- SecurityManager
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- Strings
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- super keyword
- The Classpath
- The Java Command - 'java' and 'javaw'
- The java.util.Objects Class
- ThreadLocal
- TreeMap and TreeSet
- Type Conversion
- Unit Testing
- Using Other Scripting Languages in Java
- Using the static keyword
- Using ThreadPoolExecutor in MultiThreaded applications.
- Varargs (Variable Argument)
- Visibility (controlling access to members of a class)
- WeakHashMap
- XJC
- XML Parsing using the JAXP APIs
- XML XPath Evaluation
- XOM - XML Object Model
Java Language Random Number Generation Generating Random Numbers with a Specified Seed
Example
//Creates a Random instance with a seed of 12345.
Random random = new Random(12345L);
//Gets a ThreadLocalRandom instance
ThreadLocalRandom tlr = ThreadLocalRandom.current();
//Set the instance's seed.
tlr.setSeed(12345L);
Using the same seed to generate random numbers will return the same numbers every time, so setting a different seed for every Random instance is a good idea if you don't want to end up with duplicate numbers.
A good method to get a Long that is different for every call is System.currentTimeMillis():
Random random = new Random(System.currentTimeMillis());
ThreadLocalRandom.current().setSeed(System.currentTimeMillis());
