ackage com.test;importjava.sql.Connection;importjava.sql.SQLException;importjava.sql.Statement;publicclassTestDaoNew{// ①使用ThreadLocal保存Connection变量privatestaticThreadLocal<Connection>connThreadLocal=newThreadLocal<Connection>();publicstaticConnectiongetConnection(){// ②如果connThreadLocal没有本线程对应...
publicclassThreadLocalTest{privatestaticThreadLocal<String>threadLocal=newThreadLocal<>();publicstaticvoidmain(String[]args){Thread thread1=newThread(()->{threadLocal.set("本地变量1");print("thread1");System.out.println("线程1的本地变量的值为:"+threadLocal.get());});Thread thread2=newThrea...
Namespace: Java.Lang Assembly: Mono.Android.dll This class extends ThreadLocal to provide inheritance of values from parent thread to child thread: when a child thread is created, the child receives initial values for all inheritable thread-local variables for which the parent has values....
at com.demo.test.TestThreadLocal.getLong(TestThreadLocal.java:14) at com.demo.test.TestThreadLocal.main(TestThreadLocal.java:25) 但是如果改成下面这段代码,即重写了initialValue方法: package com.demo.test; public class TestThreadLocal { ThreadLocal<Long> longLocal = new ThreadLocal<Long>(){ pr...
* @see #withInitial(java.util.function.Supplier) */publicThreadLocal(){ } 内部啥也没做。 initialValue函数 initialValue函数用来设置ThreadLocal的初始值,函数签名如下: protectedTinitialValue(){returnnull; } 该函数在调用get函数的时候会第一次调用,但是如果一开始就调用了set函数,则该函数不会被调用。通常该...
* outside of the ThreadLocal class. The class is package private to * allow declaration of fields in class Thread. To help deal with * very large and long-lived usages, the hash table entries use * WeakReferences for keys. However, since reference queues are not ...
This class provides thread-local variables.C# 複製 [Android.Runtime.Register("java/lang/ThreadLocal", DoNotGenerateAcw=true)] [Java.Interop.JavaTypeParameters(new System.String[] { "T" })] public class ThreadLocal : Java.Lang.Object
ThreadLocal类是Java中的一个线程局部变量。它的作用是使得每个线程都拥有一个独立的变量副本,每个线程可以对自己的变量副本进行修改,但不会影响到其他线程的变量副本。 也就是说,只有当前线程可以访问,既然只有当前线程可以访问,那就必然是线程安全的。 3、ThreadLocal作用 ...
简介:Java并发编程 - 线程封闭之 ThreadLocal(二) get()方法 /*** Returns the value in the current thread's copy of this* thread-local variable. If the variable has no value for the* current thread, it is first initialized to the value returned* by an invocation of the {@link #initialVa...
Java多线程--InheritableThreadLocal--使用/实例,本文介绍InheritableThreadLocal的用法。ThreadLocal可以将数据绑定当前线程,如果希望当前线程的ThreadLocal的数据被子线程使用,实现方式就会相当困难(需要用户自己在代码中传递)。InheritableThreadLocal可以方便地让