Question

我执行了以下代码：

public class TestMain extends Thread{

    public static Runnable getRunnableObject(){
        Runnable r = new Runnable(){
            @Override
            public void run() {
                System.out.println("inside runnable");
            }
        };

        return r;           
    }

    public static void main(String args[]){
        Thread t2 = new Thread(getRunnableObject());
    //  t2.start();
        System.out.println("name "+t2.getName()+" id "+t2.getPriority()+" class "+t2.getClass()
                +" priortity "+t2.getPriority()+" state "+t2.getState()+" alive/dead "+t2.isAlive());

        System.out.println("runtime"+Runtime.getRuntime().availableProcessors());
        t2.setPriority(MAX_PRIORITY);
        System.out.println(t2.getPriority());

        t2.setPriority(MIN_PRIORITY);
        System.out.println(t2.getPriority());

        t2.setPriority(NORM_PRIORITY);
        System.out.println(t2.getPriority());
    }
}

输出：

name Thread-0 id 5 class class java.lang.Thread priortity 5 state NEW alive/dead false
runtime4
10
1
5

现在，我再次运行它，取消第22行的代码注释。

输出2：

inside runnable
name Thread-0 id 5 class class java.lang.Thread priortity 5 state RUNNABLE alive/dead true
runtime4
5
5
5

您能告诉我为什么在线程上调用start（）时不能设置优先级吗？

Answer 1

这是比赛条件。

当您尝试设置private encryptAndDecrypt encryptedFile; ... int[] data = new int[999]; for (int i = 0; i <= 998; i++) { data[i] = 0; } data[index] = 1; encryptedFile.saveData(data);的优先级时，它已经死了。如果您将System.IO.IOException: Sharing violation on path C:\Users\...\AppData\LocalLow\test\...\AnsweredData.dat at System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean anonymous, FileOptions options) [0x00251] in /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.IO/FileStream.cs:320 at System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize) [0x00000] in <filename unknown>:0 at (wrapper remoting-invoke-with-check) System.IO.FileStream:.ctor (string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare,int) at System.IO.File.Create (System.String path, Int32 bufferSize) [0x00000] in /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.IO/File.cs:135 at System.IO.File.Create (System.String path) [0x00000] in /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.IO/File.cs:130 at encryptAndDecrypt.saveData (System.Int32[] value) [0x0001a] in D:\unity\Joon Team\Joon Project\Assets\Joon Asset\Scripts\EncryptedData Scripts\encryptAndDecrypt.cs:31 UnityEngine.Debug:Log(Object) encryptAndDecrypt:saveData(Int32[]) (at Assets/Joon Asset/Scripts/EncryptedData Scripts/encryptAndDecrypt.cs:42) singlePlayerGameManager:saveDatatoFile() (at Assets/Joon Asset/Scripts/Single Player Scene Scripts/singlePlayerGameManager.cs:147) singlePlayerGameManager:option1Selected() (at Assets/Joon Asset/Scripts/Single Player Scene Scripts/singlePlayerGameManager.cs:86) UnityEngine.EventSystems.EventSystem:Update()更改为阻止一段时间，例如：

t2

然后您将获得相同的序列10、1、5。

在线程对象上调用start时，在线程上设置的优先级无效

1 个答案: