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class GuardedObject<T> {
  // 受保护的对象
  T obj;
  final Lock lock = new ReentrantLock();
  final Condition done = lock.newCondition();
  final int timeout = 1;
  
  T get(Predicate<T> p) {
    lock.lock();
    try{

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/**
 * @author luxz
 * @date 2020/6/27-3:31 AM
 * 如果执行乐观读操作期间，存在写操作，会把乐观读升级为悲观读锁
 */
public class Point {
    private int x, y;
    final StampedLock sl = new StampedLock();

    int distanceFromOrigin() {

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class CacheData {
  Object data;
  volatile boolean isCacheValid;
  final ReadWriteLock rwl = new ReentrantReadWriteLock();
  // 读锁
  final Lock r = rwl.readLock();
  // 写锁
  final Lock w = rwl.writeLock();
  
  void processCacheData() {

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class VolatileExample {
  int x = 0;
  volatile boolean v = false;
  
  void writer() {
    x = 42;
    v = true;
  }
  
  void reader() {

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public class LinkedStack<T> {
  private static class Node<U> {
    U item;
    Node<U> next;
    Node(){
      item = null;
      next = null;
    }
    Node(U item, Node<U> next){
      this.item = item;

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package soundsystem;

import java.util.HashMap;
import java.util.Map;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;

@Aspect
public class TrackCounter{

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package com.searover.hctest;

import org.apache.commons.lang.time.StopWatch;
import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;

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package com.anchnet.ddos.report.utils;

import com.anchnet.ddos.report.beans.MessagePack;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;

import java.io.IOException;

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/**
 * Container for an array of values that were retrieved with
 * {@link Resources.Theme#obtainStyledAttributes(AttributeSet, int[], int, int)}
 * or {@link Resources#obtainAttributes}.  Be
 * sure to call {@link #recycle} when done with them.
 *
 * The indices used to retrieve values from this structure correspond to
 * the positions of the attributes given to obtainStyledAttributes.
 */
public class TypedArray {

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public TypedArray obtainStyledAttributes(AttributeSet set,
                int[] attrs, int defStyleAttr, int defStyleRes) {
    final int len = attrs.length;
    final TypedArray array = TypedArray.obtain(Resources.this, len);
    // other code .....
    return array;
}