緩存類：

package com.zit.test;

import java.util.concurrent.BlockingDeque;
import java.util.concurrent.LinkedBlockingDeque;

public enum Cache {

	INSTANCE;
	
	public BlockingDeque<String> list = new LinkedBlockingDeque<String>();
	
	
	public void put(String str) {
		try {
			list.put(str);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}
	
	public String take(){
 		String str = null;
		try {
			str = list.take();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		return str;
	}
	
	public boolean isEmpty(){
		return list.isEmpty();
	}
}

線程1：存數據

package com.zit.test;

import javax.annotation.PostConstruct;

import org.springframework.stereotype.Component;

@Component
public class TestCache1 {

    @PostConstruct
    public void method1() {
        
        new Thread(new Runnable() {
            @Override
            public void
 
 run() {
                int i = 0; 
                while(true) {

                    Cache.INSTANCE.put("g" + i);
                    i++;
                    try {
                         Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
            
        },
 
"ThreadPut").start();
    }

}

線程2：取數據

package com.zit.test;

import javax.annotation.PostConstruct;

import org.springframework.stereotype.Component;

@Component
public class TestCache2 {

    @PostConstruct
    public void method2() {
        
        new Thread(new Runnable() {
            @Override
            public void run() {
                while(true) {
                    if(Cache.INSTANCE.isEmpty()) {
                        try {
                            Thread.sleep(200);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        continue;
                    }
                    
                    String str = Cache.INSTANCE.take();
                    System.out.println(str);
                }
            }
            
        },"ThreadTake").start();
        
        
    }

}

啟動Web工程，可見效果

奇怪的是，如果不在Web工程裏，只是運行Java類，沒有效果

Java 實現緩存，一個線程存，一個線程取