wucao

public class Snowflake {

    /**
     * configured machine id - 10 bits - gives us up to 1024 machines
     */
    private static final int BITS_MACHINE_ID = 10;

    /**
     * sequence number - 12 bits - rolls over every 4096 per machine (with protection to avoid rollover in the same ms)
     */

wucao

public class VolatileTest {

    public static boolean stop = false; // 该变量加上 volatile 后，主线程设置 stop = true 才会对 Reader 线程可见

    private static class Reader extends Thread {

        @Override
        public void run() {
            // 期望：当主线程设置 stop = true 时，Reader 线程输出 stop 并结束
            // 实际：由于共享变量 stop 没有加 volatile，主线程设置 stop = true 对 Reader 线程不可见，所以 Reader 线程永远不会结束

wucao

import org.springframework.boot.context.properties.bind.Binder;
import org.springframework.boot.context.properties.source.ConfigurationPropertySource;
import org.springframework.boot.context.properties.source.ConfigurationPropertySources;
import org.springframework.core.env.PropertiesPropertySource;

import java.util.Map;
import java.util.Properties;

public class PropertiesToNestedMap {

wucao

import okhttp3.OkHttpClient;

import javax.net.ssl.*;
import java.io.IOException;
import java.io.InputStream;
import java.security.*;
import java.security.cert.CertificateException;
import java.util.Arrays;

public class OkHttpMutualTLS {