Question

在我看来，一旦线程开始通过System.console().readLine()或System.in.read()读取输入，宇宙中绝对没有办法在功能上中断读取，除了System.exit()或提供输入

interrupt()阅读线程什么也没做。即使stop()它也什么都不做。在close()期间System.in System.in.read() {{1}}在读取完成后通过提供输入做任何事情。 read方法不会使用任何超时参数，也不会自行超时。

根本没有办法“解锁”等待永远不会出现的控制台输入的线程吗？

Answer 1

我基于此article

创建了一个变体

//TOUCH LISTENER
theCanvas.addEventListener("touchstart", startT, false);
theCanvas.addEventListener("touchend", endT, false);
theCanvas.addEventListener("touchmove", moveT, false);

//MOUSE LISTENER
theCanvas.addEventListener("mousedown", start);
theCanvas.addEventListener("mouseup", end);
theCanvas.addEventListener("mousemove", move, false);

//MOUSE EVENTS
function start(event) {
  if (event.button === MAIN_MOUSE_BUTTON) {
    shouldDraw = true;

        setLineProperties(theContext);

        theContext.beginPath();

    let elementRect = event.target.getBoundingClientRect();
        theContext.moveTo(event.clientX - elementRect.left, event.clientY - elementRect.top);

        console.log(PenType(mode));
  }
}

function end(event) {
  if (event.button === MAIN_MOUSE_BUTTON) {
    shouldDraw = false;
  }
}

function move(event) {
  if (shouldDraw) {
    let elementRect = event.target.getBoundingClientRect();
    theContext.lineTo(event.clientX - elementRect.left, event.clientY - elementRect.top);
        theContext.stroke()

  }
}

//TOUCH EVENTS
function startT(event) {
    event.preventDefault();
    shouldDraw = true;

    setLineProperties(theContext);

    theContext.beginPath();

    let elementRect = event.target.getBoundingClientRect();
    theContext.moveTo(event.clientX - elementRect.left, event.clientY - elementRect.top);

    console.log(PenType(mode));
}

function endT(event) {
  if (event.touches.length == 1) {
        event.preventDefault();
    shouldDraw = false;
  }
}

function moveT(event) {
  if (shouldDraw) {
        event.preventDefault();
    let elementRect = event.target.getBoundingClientRect();
    theContext.lineTo(event.clientX - elementRect.left, event.clientY - elementRect.top);
        theContext.stroke()
  }
}

主程序的一部分

let myDate = getDateSomewhere();
Date.parse(myDate);

您可以通过在另一个线程中调用import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.concurrent.Callable; public class ConsoleInputReadTask implements Callable<String> { private boolean cont = true; public void stop() { cont = false; } public String call() throws IOException { BufferedReader br = new BufferedReader( new InputStreamReader(System.in)); System.out.println("ConsoleInputReadTask run() called."); String input; try { // wait until we have data to complete a readLine() while (!br.ready()) { Thread.sleep(200); if (!cont) { System.out.println("ConsoleInputReadTask() stopped"); return null; } } input = br.readLine(); } catch (InterruptedException e) { System.out.println("ConsoleInputReadTask() cancelled"); return null; } return input; } }来停止private ConsoleInputReadTask consoleInputReadTask; public String readLine() throws InterruptedException { ExecutorService ex = Executors.newSingleThreadExecutor(); String input = null; try { Future<String> result = ex.submit(consoleInputReadTask); try { input = result.get(); } catch (ExecutionException e) { e.getCause().printStackTrace(); } } finally { ex.shutdownNow(); } return input; } public void test() { consoleInputReadTask = new ConsoleInputReadTask(); while ((line = readLine()) != null) { // ... }

中断System.console（）。readLine（）？

1 个答案: