[英]Pass integer to running thread in java
I have a problem in Java with threads. 我在Java中遇到线程问题。 I am trying to pass an integer from the mainthread to another running thread in Java - but the value is always 0. Is there a way to solve this? 我试图从mainthread传递一个整数到Java中的另一个运行线程 - 但值总是为0.有没有办法解决这个问题? I guess the reason why this happends is that threads have their own lives. 我想这就是为什么线程有自己的生命。
Here is the class that receives the integer - via an accessor-method. 这是接收整数的类 - 通过访问器方法。 Then its supposed to be printed in the print-method - but as I mentioned, the value is ZERO. 然后它应该在打印方法中打印 - 但正如我所提到的,值是零。
class MyThread implements Runnable {
private int val;
public void run() {
printVal();
}
public void setValue(int val) {
this.val = val;
}
private void printVal() {
while (true) {
System.out.println("val: " + this.val);
try {
Thread.sleep(1000);
} catch (InterruptedException ie) {
}
}
}
}
It seems that you got an obstacle made by cached value of variable. 看来你有一个缓存的变量值所造成的障碍。 To solve it, please declare your int
as volatile 要解决它,请将您的int
声明为volatile
private volatile int mainVal;
so that int
will not be cached. 这样int
就不会被缓存了。 Now you can pass it to other threads without cache effect. 现在您可以将其传递给其他没有缓存效果的线程。
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