对于第二种,jvm首先会在内部维护的strings pool中通过String的 equels 方法查找是对象池中是否存放有该String对象,如果有,则返回已有的String对象给用户,而不会在heap中重新创建一个新的String对象;如果对象池中没有该String对象,jvm则在heap中创建新的String对象,将其引用返回给用户,同时将该引用添加至strings pool中...
@Test public void givenUsingPlainJava_whenGeneratingRandomStringUnbounded_thenCorrect() { byte[] array = new byte[7]; // length is bounded by 7 new Random().nextBytes(array); String generatedString = new String(array, Charset.forName("UTF-8")); System.out.println(generatedString); } Keep...
importjava.security.MessageDigest;importjava.security.NoSuchAlgorithmException;publicclassRandomCodeGenerator{publicstaticStringgenerateRandomCode(){StringrandomString=RandomStringGenerator.generateRandomString(16);try{MessageDigestmd=MessageDigest.getInstance("MD5");byte[]digest=md.digest(randomString.getBytes());St...
System.out.println("RandomStringUtils.random4-->"+ RandomStringUtils.random(6,0,chars.length,false,false, chars)); String str ="123abc"; System.out.println("RandomStringUtils.random5-->"+ RandomStringUtils.random(6, str)); System.out.println("RandomStringUtils.random6-->"+ RandomStringUtils....
使用Random类生成随机字符序列 import java.util.Random; public class RandomStringGenerator { private static final String CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; public static String generateRandomString(int length) { StringBuilder sb = new StringBuilder(); Random rando...
public static String randomString(int strLength) { Random rnd = ThreadLocalRandom.current(); StringBuilder ret = new StringBuilder(); for (int i = 0;
import java.util.Random; public class RandomStringGenerator { public static void main(String[] args) { String randomString = generateRandomString(10); System.out.println("Random String: " + randomString); } public static String generateRandomString(int length) { // 定义允许的字符集 String cha...
虽然 ThreadLocalRandom 不支持手动设置随机种子的方法，但并不代表 ThreadLocalRandom 就是完美的，当我们查看 ThreadLocalRandom 初始化随机种子的方法 initialSeed() 源码时发现，默认情况下它的随机种子也是以当前时间有关，源码如下：privatestaticlonginitialSeed() {// 尝试获取 JVM 的启动参数 String sec = ...
String generatedString = random.ints(leftLimit, rightLimit +1) .limit(targetStringLength) .collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append) .toString(); System.out.println(generatedString); } 2. 使用 Java 8+ 版本创建随机字母数字 [0–9a-Z] 字符串,我们可以使用...