标签：catch new t highlight ada adl initial get return rac
InheritableThreadLocal可以在子线程中取得父线程继承下来的值，即可以让子线程从父进程中取得值。
package org.github.lujiango;
public class Test04 {
static InheritableThreadLocal<String> itl = new InheritableThreadLocal<String>();
static class ThreadA extends Thread {
@Override
public void run() {
try {
System.out.println("ThreadA get: " + itl.get());
} catch (Exception e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
try {
itl.set("Main");
Thread.sleep(1000);
ThreadA a = new ThreadA();
a.start();
} catch (Exception e) {
e.printStackTrace();
}
}
}
InheritableThreadLocal即可以设置默认值，也可以在继承父线程值的同时修改。
package org.github.lujiango;
class InheritableThreadLocalExt extends InheritableThreadLocal<String> {
@Override
protected String initialValue() {
return "defalut";
}
@Override
protected String childValue(String parentValue) {
return parentValue + " child";
}
}
public class Test04 {
static InheritableThreadLocalExt itl = new InheritableThreadLocalExt();
static class ThreadA extends Thread {
@Override
public void run() {
try {
Thread.sleep(1000);
System.out.println("ThreadA get: " + itl.get());
} catch (Exception e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
try {
System.out.println(itl.get());
itl.set("Main1");
Thread.sleep(1000);
ThreadA a = new ThreadA();
a.start();
itl.set("Main2");
System.out.println(itl.get());
} catch (Exception e) {
e.printStackTrace();
}
}
}
注：如果子线程在取得值得同时，主线程将InheritableThreadLocal中的值进行更改，那么子线程取到的值还是旧值。
标签：catch new t highlight ada adl initial get return rac
原文地址：http://www.cnblogs.com/lujiango/p/7580796.html
