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Java内容重新整理删除过期的东西
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estom
101
Java/JavaDemo/codedemo/java/util/future/Future.ucls
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101
Java/JavaDemo/codedemo/java/util/future/Future.ucls
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<?xml version="1.0" encoding="UTF-8"?>
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<class-diagram version="1.1.6" icons="true" always-add-relationships="false" generalizations="true" realizations="true"
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associations="true" dependencies="false" nesting-relationships="true">
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<interface id="1" language="java" name="java.util.concurrent.Future" project="JavaDemo"
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file="/devdata/java/jdk/jdk1.7.0_60/jre/lib/rt.jar" binary="true" corner="BOTTOM_RIGHT">
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<position height="-1" width="-1" x="334" y="85"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" accessors="true"
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visibility="true">
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<attributes public="false" package="true" protected="false" private="false" static="false"/>
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<operations public="true" package="true" protected="false" private="false" static="false"/>
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</display>
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</interface>
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<class id="2" language="java" name="java.util.concurrent.FutureTask" project="JavaDemo"
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file="/devdata/java/jdk/jdk1.7.0_60/jre/lib/rt.jar" binary="true" corner="BOTTOM_RIGHT">
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<position height="-1" width="-1" x="521" y="477"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" accessors="true"
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visibility="true">
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<attributes public="false" package="true" protected="false" private="false" static="false"/>
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<operations public="true" package="true" protected="false" private="false" static="false"/>
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</display>
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</class>
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<interface id="3" language="java" name="java.util.concurrent.RunnableFuture" project="JavaDemo"
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file="/devdata/java/jdk/jdk1.7.0_60/jre/lib/rt.jar" binary="true" corner="BOTTOM_RIGHT">
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<position height="-1" width="-1" x="521" y="280"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" accessors="true"
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visibility="true">
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<attributes public="false" package="true" protected="false" private="false" static="false"/>
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<operations public="true" package="true" protected="false" private="false" static="false"/>
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</display>
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</interface>
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<interface id="4" language="java" name="java.util.concurrent.RunnableScheduledFuture" project="JavaDemo"
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file="/devdata/java/jdk/jdk1.7.0_60/jre/lib/rt.jar" binary="true" corner="BOTTOM_RIGHT">
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<position height="-1" width="-1" x="130" y="410"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" accessors="true"
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visibility="true">
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<attributes public="false" package="true" protected="false" private="false" static="false"/>
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<operations public="true" package="true" protected="false" private="false" static="false"/>
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</display>
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</interface>
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<interface id="5" language="java" name="java.util.concurrent.ScheduledFuture" project="JavaDemo"
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file="/devdata/java/jdk/jdk1.7.0_60/jre/lib/rt.jar" binary="true" corner="BOTTOM_RIGHT">
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<position height="-1" width="-1" x="131" y="272"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" accessors="true"
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visibility="true">
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<attributes public="false" package="true" protected="false" private="false" static="false"/>
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<operations public="true" package="true" protected="false" private="false" static="false"/>
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</display>
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</interface>
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<interface id="6" language="java" name="java.util.concurrent.Delayed" project="JavaDemo"
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file="/devdata/java/jdk/jdk1.7.0_60/jre/lib/rt.jar" binary="true" corner="BOTTOM_RIGHT">
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<position height="-1" width="-1" x="131" y="119"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" accessors="true"
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visibility="true">
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<attributes public="false" package="true" protected="false" private="false" static="false"/>
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<operations public="true" package="true" protected="false" private="false" static="false"/>
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</display>
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</interface>
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<interface id="7" language="java" name="java.lang.Runnable" project="JavaDemo"
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file="/devdata/java/jdk/jdk1.7.0_60/jre/lib/rt.jar" binary="true" corner="BOTTOM_RIGHT">
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<position height="-1" width="-1" x="521" y="119"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" accessors="true"
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visibility="true">
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<attributes public="false" package="true" protected="false" private="false" static="false"/>
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<operations public="true" package="true" protected="false" private="false" static="false"/>
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</display>
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</interface>
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<generalization id="8">
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<end type="SOURCE" refId="4"/>
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<end type="TARGET" refId="5"/>
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</generalization>
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<generalization id="9">
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<end type="SOURCE" refId="3"/>
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<end type="TARGET" refId="7"/>
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</generalization>
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<generalization id="10">
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<end type="SOURCE" refId="4"/>
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<end type="TARGET" refId="3"/>
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</generalization>
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<generalization id="11">
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<end type="SOURCE" refId="5"/>
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<end type="TARGET" refId="6"/>
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</generalization>
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<generalization id="12">
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<end type="SOURCE" refId="5"/>
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<end type="TARGET" refId="1"/>
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</generalization>
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<generalization id="13">
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<end type="SOURCE" refId="3"/>
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<end type="TARGET" refId="1"/>
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</generalization>
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<realization id="14">
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<end type="SOURCE" refId="2"/>
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<end type="TARGET" refId="3"/>
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</realization>
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<classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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accessors="true" visibility="true">
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<attributes public="false" package="true" protected="false" private="false" static="false"/>
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<operations public="true" package="true" protected="false" private="false" static="false"/>
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</classifier-display>
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<association-display labels="true" multiplicity="true"/>
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</class-diagram>
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106
Java/JavaDemo/codedemo/java/util/future/HelloFuture.java
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106
Java/JavaDemo/codedemo/java/util/future/HelloFuture.java
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package cn.aofeng.demo.java.util.future;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.Callable;
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import java.util.concurrent.CancellationException;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.concurrent.Future;
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import java.util.concurrent.TimeUnit;
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import org.apache.log4j.Logger;
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/**
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* Future、Callable练习。
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*
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* @author <a href="mailto:aofengblog@163.com">聂勇</a>
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*/
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public class HelloFuture {
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private static Logger _logger = Logger.getLogger(HelloFuture.class);
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/**
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* @param args
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* @throws InterruptedException
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*/
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public static void main(String[] args) throws InterruptedException {
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executeSingleTask();
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executeBatchTask();
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}
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/**
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* 执行单个异步任务：<br>
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* 1、用submit方法向线程池提交一个任务。<br>
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* 2、获取结果时，指定了超时时间。<br><br>
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* 结果：超时后，调用者收到TimeoutException，但实际上任务还在继续执行。
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* @throws InterruptedException
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*/
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private static void executeSingleTask() throws InterruptedException {
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ExecutorService threadpool = Executors.newFixedThreadPool(6);
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try {
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Future<Integer> f = threadpool.submit(createCallable(5 * 1000));
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Object result = f.get(3, TimeUnit.SECONDS);
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System.out.println("单个任务的执行结果："+result);
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} catch (Exception e) {
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_logger.error("线程执行任务时出错", e);
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} finally {
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threadpool.shutdown();
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threadpool.awaitTermination(10, TimeUnit.SECONDS);
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}
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}
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/**
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* 执行多个异步任务：<br>
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* 1、用invokeAll方法向线程池提交多个任务，并指定了执行的超时时间。<br><br>
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* 结果：超时后，未执行完成的任务被取消，在调用Future的get方法时，取消的任务会抛出CancellationException，执行完成的任务可获得结果。
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* @throws InterruptedException
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*/
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private static void executeBatchTask() throws InterruptedException {
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ExecutorService threadpool = Executors.newFixedThreadPool(6);
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List<Callable<Integer>> tasks = new ArrayList<Callable<Integer>>();
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tasks.add(createCallable(2000));
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tasks.add(createCallable(5000));
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tasks.add(createCallable(2500));
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long startTime = System.currentTimeMillis();
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try {
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List<Future<Integer>> fs = threadpool.invokeAll(tasks, 3, TimeUnit.SECONDS);
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int result = 0;
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for (Future<Integer> f : fs) {
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try{
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result += f.get();
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} catch(CancellationException ce) {
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// nothing
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}
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}
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System.out.println("执行三个任务共耗时：" + (System.currentTimeMillis() - startTime) + "毫秒");
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System.out.println("三个任务的执行结果汇总："+result);
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} catch (Exception e) {
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_logger.error("线程执行任务时出错", e);
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} finally {
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threadpool.shutdown();
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threadpool.awaitTermination(10, TimeUnit.SECONDS);
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}
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}
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/**
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* 创建需要长时间执行的任务模拟对象。
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* @param sleepTimes 线程休眠时间（单位：毫秒）
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* @return {@link Callable}对象
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*/
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private static Callable<Integer> createCallable(final int sleepTimes) {
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Callable<Integer> c = new Callable<Integer>() {
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@Override
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public Integer call() throws Exception {
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Thread.sleep(sleepTimes);
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System.out.println(Thread.currentThread().getName() + ": I'm working");
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return 9;
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}
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};
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return c;
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}
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}
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