ThreadLocalRandom api详解

今天时间学习ThreadLocalRandom api，该类是JUC原子包中的类，通过单元测试代码把所有public api方法跑了一遍，大致了解了底层实现，初学乍练，有很多一知半解的地方，待后续有了深入理解再来补充

package test.java.util.concurrent;import java.util.concurrent.ThreadLocalRandom;
import org.junit.Test;/*** ThreadLocalRandom的测试类** @date 2020-07-28 22:14:27*/
public class ThreadLocalRandomTest {/*** 获取当前线程对应的ThreadLocalRandom* @Param*/@Testpublic void testCurrent()throws Exception{System.out.println(ThreadLocalRandom.current().doubles().count());}/*** 设置随机数生成器的种子* @Param*/@Testpublic void testSetSeed()throws Exception{ThreadLocalRandom.current().setSeed(333);}/***获取下一个随机整数* @Param*/@Testpublic void testNextInt()throws Exception{System.out.println(ThreadLocalRandom.current().nextInt());}/***获取下一个随机整数,指定上限* @Param*/@Testpublic void testNextInt1()throws Exception{System.out.println(ThreadLocalRandom.current().nextInt(3));}/*** 获取下一个随机整数,指定下限和上限* @Param*/@Testpublic void testNextInt2()throws Exception{System.out.println(ThreadLocalRandom.current().nextInt(3, 4));}/***获取下一个随机长整数* @Param*/@Testpublic void testNextLong()throws Exception{System.out.println(ThreadLocalRandom.current().nextLong());}/***获取下一个随机长整数,指定上限* @Param*/@Testpublic void testNextLong1()throws Exception{System.out.println(ThreadLocalRandom.current().nextLong(3));}/***获取下一个随机整数,指定下限和上限* @Param*/@Testpublic void testNextLong2()throws Exception{System.out.println(ThreadLocalRandom.current().nextLong(3, 4));}/***获取下一个随机double* @Param*/@Testpublic void testNextDouble()throws Exception{System.out.println(ThreadLocalRandom.current().nextDouble());}/***获取下一个随机double,指定上限* @Param*/@Testpublic void testNextDouble1()throws Exception{System.out.println(ThreadLocalRandom.current().nextDouble(3));}/***获取下一个随机double,指定下限和上限* @Param*/@Testpublic void testNextDouble2()throws Exception{System.out.println(ThreadLocalRandom.current().nextDouble(3, 4));}/*** 获取随机boolean值* @Param*/@Testpublic void testNextBoolean()throws Exception{System.out.println(ThreadLocalRandom.current().nextBoolean());}/***获取随机boolean值* @Param*/@Testpublic void testNextFloat()throws Exception{System.out.println(ThreadLocalRandom.current().nextFloat());}/***返回下一个伪随机数* @Param*/@Testpublic void testNextGaussian()throws Exception{System.out.println(ThreadLocalRandom.current().nextGaussian());}/*** 获取指定大小的int处理流* @Param*/@Testpublic void testInts()throws Exception{System.out.println(ThreadLocalRandom.current().ints(3L).count());}/*** 获取int处理流* @Param*/@Testpublic void testInts1()throws Exception{System.out.println(ThreadLocalRandom.current().ints().count());}/***获取指定大小的int处理流,指定最低和最高值* @Param*/@Testpublic void testInts2()throws Exception{System.out.println(ThreadLocalRandom.current().ints(3,3,3).count());}/***获取int处理流,指定最低和最高值* @Param*/@Testpublic void testInts3()throws Exception{System.out.println(ThreadLocalRandom.current().ints(3,3).count());}/***获取指定大小的long处理流* @Param*/@Testpublic void testLongs()throws Exception{System.out.println(ThreadLocalRandom.current().longs(3L).count());}/***获取long处理流* @Param*/@Testpublic void testLongs1()throws Exception{System.out.println(ThreadLocalRandom.current().longs().count());}/***获取指定大小的long处理流,指定最低和最高值* @Param*/@Testpublic void testLongs2()throws Exception{System.out.println(ThreadLocalRandom.current().longs(3,3,3).count());}/***获取long处理流,指定最低和最高值* @Param*/@Testpublic void testLongs3()throws Exception{System.out.println(ThreadLocalRandom.current().longs(3,3).count());}/***获取指定大小的double处理流* @Param*/@Testpublic void testDoubles()throws Exception{System.out.println(ThreadLocalRandom.current().doubles(3L).count());}/***获取double处理流* @Param*/@Testpublic void testDoubles1()throws Exception{System.out.println(ThreadLocalRandom.current().doubles().count());}/***获取指定大小的double处理流,指定最低和最高值* @Param*/@Testpublic void testDoubles2()throws Exception{System.out.println(ThreadLocalRandom.current().doubles(3,3,3).count());}/***获取double处理流,指定最低和最高值* @Param*/@Testpublic void testDoubles3()throws Exception{System.out.println(ThreadLocalRandom.current().doubles(3,3).count());}
}