Thread:
CPU scheduling and distribution of basic unit, the basic need of system resources, has only a little in the operation of essential resources
Four ways to create a thread
1. implement Runnable, override run method
specific methods:
class RunnableDemo implements Runnable{
public void run() {
for (int i = 0, j=10;i<j;i++){
System.out.println(i);
}
}
}
transfer:
RunnableDemo runnableDemo = new RunnableDemo();
new Thread(runnableDemo).start();
2. Thread class inheritance, override the run method
specific methods:
class ThreadDemo extends Thread{
@Override
public void run() {
for (int i = 0, j=10;i<j;i++){
System.out.println(i);
}
}
}
transfer:
new ThreadDemo().start();
3. To achieve callable interface rewrite method call
class CallableDemo implements Callable<Integer>{
public Integer call() {
int sum = 0;
for (int i = 0, j=10;i<j;i++){
System.out.println(i);
sum+=i ;
}
return sum;
}
}
transfer:
CallableDemo callableDemo = new CallableDemo();
FutureTask<Integer> futureTask = new FutureTask<Integer>(callableDemo);
new Thread(futureTask).start();
System.out.println(futureTask.get());
Description :
a FutureTask, inherited from RunnableFuture, RunnableFuture inherited from Runnable so you can create a thread (polymorphism)
use futureTask.get (), you will get the return value,But the thread is not enabled
Lack of study time, too shallow knowledge, that's wrong, please forgive me.
There are 10 kinds of people in the world, one is to understand binary, one is do not understand binary.
