JavaNoobPig

package com.pig20;

public class Main {

	public static void main(String[] args) throws InterruptedException {
		InventoryCounter inventoryCounter =new InventoryCounter();
		IncrementingThread incrementingThread=new IncrementingThread(inventoryCounter);
		DecrementingThread decrementingThread=new DecrementingThread(inventoryCounter);
		
		incrementingThread.start();

JavaNoobPig

public class SimpleCountDownLatch {
    private int count;
 
    public SimpleCountDownLatch(int count) {
        this.count = count;
        if (count < 0) {
            throw new IllegalArgumentException("count cannot be negative");
        }
    }
 

JavaNoobPig

package com.pig19;

//這是編碼練習的自己的解答
public class SimpleCountDownLatch_solu {
	private int count;

	public SimpleCountDownLatch_solu(int count) {
		this.count = count;
		if (count < 0) {
			throw new IllegalArgumentException("count cannot be negative");

JavaNoobPig

package com.pig19;
//這是編碼練習的題目
public class SimpleCountDownLatch {
	private int count;

    public SimpleCountDownLatch(int count) {
        this.count = count;
        if (count < 0) {
            throw new IllegalArgumentException("count cannot be negative");
        }

JavaNoobPig

/*
 * MIT License
 *
 * Copyright (c) 2019 Michael Pogrebinsky
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is

JavaNoobPig

/*
 * MIT License
 *
 * Copyright (c) 2019 Michael Pogrebinsky
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is

JavaNoobPig

package com.pig18;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Random;
import java.util.StringJoiner;

/**
 * Objects as Condition Variables - Wait(), Notify() and NotifyAll()

JavaNoobPig

package com.pig18;

import java.util.LinkedList;
import java.util.Queue;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class Main {

JavaNoobPig

package com.pig17;

import java.util.*;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

/**
 * Reentrant Read Write Lock & Database Implementation
 * https://www.udemy.com/java-multithreading-concurrency-performance-optimization

JavaNoobPig

package com.pig17;

import java.util.*;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

/**
 * Reentrant Read Write Lock & Database Implementation
 * https://www.udemy.com/java-multithreading-concurrency-performance-optimization