java的ThreadLocal類的使用方法，ThreadLocal是一個支持泛型的類，用在多線程中用于防止并發沖突問題。

比如以下的一個樣例，就是用于線程添加1，可是相互不沖突

package com.test.threadlocal;import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors;class Local {private static ThreadLocal<Integer> num=new ThreadLocal<Integer>(){protected synchronized Integer initialValue(){return 1;}};public static void add(){num.set(num.get()+1);}public static int get(){return num.get();} }class SelfThread extends Thread {public void run(){for(int i=0;i<1000;i++){System.out.println(this.getName()+" "+Local.get());this.yield();Local.add();}} } public class MyThreadLocal {/*** @param args*/public static void main(String[] args) {// TODO Auto-generated method stubExecutorService exec=Executors.newCachedThreadPool();for(int i=0;i<5;i++){exec.execute(new SelfThread());}exec.shutdown();}}

輸出結果

Thread-3 ?973
Thread-1 ?808
Thread-3 ?974
Thread-1 ?809
Thread-3 ?975
Thread-1 ?810
Thread-3 ?976
Thread-1 ?811
Thread-3 ?977
Thread-1 ?812
Thread-3 ?978
Thread-1 ?813
Thread-3 ?979
Thread-1 ?814
Thread-3 ?980
Thread-1 ?815
Thread-3 ?981
Thread-1 ?816
Thread-3 ?982
Thread-1 ?817
Thread-3 ?983
Thread-1 ?818
Thread-3 ?984
Thread-1 ?819
Thread-3 ?985
Thread-1 ?820
Thread-3 ?986
Thread-1 ?821
Thread-3 ?987
Thread-1 ?822
Thread-3 ?988
Thread-1 ?823
Thread-3 ?989
Thread-1 ?824
Thread-3 ?990
Thread-1 ?825
Thread-3 ?991
Thread-1 ?826
Thread-3 ?992
Thread-1 ?827
Thread-3 ?993
Thread-1 ?828
Thread-3 ?994
Thread-1 ?829
Thread-3 ?995
Thread-1 ?830
Thread-3 ?996
Thread-1 ?831
Thread-3 ?997
Thread-1 ?832
Thread-3 ?998
Thread-1 ?833
Thread-3 ?999
Thread-1 ?834
Thread-3 ?1000
Thread-1 ?835
Thread-1 ?836
Thread-1 ?837
Thread-1 ?838
Thread-1 ?839
Thread-1 ?840
Thread-1 ?841
Thread-1 ?842
Thread-1 ?843
Thread-1 ?844
Thread-1 ?845
Thread-1 ?846
Thread-1 ?847
Thread-1 ?848
Thread-1 ?849
Thread-1 ?850
Thread-1 ?851
Thread-1 ?852
Thread-1 ?853
Thread-1 ?854
Thread-1 ?855
Thread-1 ?856
Thread-1 ?857
Thread-1 ?858
Thread-1 ?859
Thread-1 ?860
Thread-1 ?861
Thread-1 ?862
Thread-1 ?863
Thread-1 ?864
Thread-1 ?865
Thread-1 ?866
Thread-1 ?867
Thread-1 ?868
Thread-1 ?869
Thread-1 ?870
Thread-1 ?871
Thread-1 ?872
Thread-1 ?873
Thread-1 ?874

我們發現。線程會相互切換，可是每一個線程都保持了添加1的順序，說明沒有線程之間的相互干擾。

轉載于:https://www.cnblogs.com/lxjshuju/p/7403794.html

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