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来自 , 2019-12-12, 写在 Java, 查看 130 次.
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/**
* Daemon(守护)线程 Daemon线程区别一般线程之处是:
* 只有虚拟机中的用户线程(非Daimon线程)全部结束,Daemon线程就会立即结束,并且也不会调用finally里的语句。
* daemon线程所产生的所有线程都是daemon的
*/
public
class
Daemon
{
static
class
MainThread
extends
Thread
{
public
void
run
(
)
{
System
.
out
.
println
(
"MainThread is daemon? "
+
this
.
isDaemon
(
)
)
;
System
.
out
.
println
(
"MainThread begin!"
)
;
// 启动子线程
Thread
sub1
=
new
SubThread
(
)
;
// sub1线程为守护线程
sub1.
setDaemon
(
true
)
;
sub1.
start
(
)
;
try
{
Thread
.
sleep
(
1000
)
;
}
catch
(
InterruptedException
e
)
{
e.
printStackTrace
(
)
;
}
finally
{
System
.
out
.
println
(
"MainThread"
+
" finally"
)
;
}
System
.
out
.
println
(
"MainThread end!"
)
;
}
}
static
class
SubThread
extends
Thread
{
public
void
run
(
)
{
System
.
out
.
println
(
"SubThread is daemon? "
+
this
.
isDaemon
(
)
)
;
System
.
out
.
println
(
"SubThread begin!"
)
;
int
i
=
0
;
try
{
while
(
i
<
10
)
{
System
.
out
.
println
(
"SubThread "
+
i
++
)
;
Thread
.
sleep
(
200
)
;
}
}
catch
(
InterruptedException
e
)
{
e.
printStackTrace
(
)
;
}
finally
{
System
.
out
.
println
(
"SubThread finally"
)
;
}
System
.
out
.
println
(
"SubThread end!"
)
;
}
}
public
static
void
main
(
String
[
]
args
)
{
System
.
out
.
println
(
"Main begin!"
)
;
// 默认情况下mainThread是普通线程
Thread
mainThread
=
new
MainThread
(
)
;
// 启动mainThread线程
mainThread.
start
(
)
;
try
{
Thread
.
sleep
(
500
)
;
}
catch
(
InterruptedException
e1
)
{
e1.
printStackTrace
(
)
;
}
System
.
out
.
println
(
"Main end!"
)
;
}
}
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/** * Daemon(守护)线程 Daemon线程区别一般线程之处是: * 只有虚拟机中的用户线程(非Daimon线程)全部结束,Daemon线程就会立即结束,并且也不会调用finally里的语句。 * daemon线程所产生的所有线程都是daemon的 */ public class Daemon { static class MainThread extends Thread { public void run() { System.out.println("MainThread is daemon? " + this.isDaemon()); System.out.println("MainThread begin!"); // 启动子线程 Thread sub1 = new SubThread(); // sub1线程为守护线程 sub1.setDaemon(true); sub1.start(); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } finally { System.out.println("MainThread" + " finally"); } System.out.println("MainThread end!"); } } static class SubThread extends Thread { public void run() { System.out.println("SubThread is daemon? " + this.isDaemon()); System.out.println("SubThread begin!"); int i = 0; try { while (i < 10) { System.out.println("SubThread " + i++); Thread.sleep(200); } } catch (InterruptedException e) { e.printStackTrace(); } finally { System.out.println("SubThread finally"); } System.out.println("SubThread end!"); } } public static void main(String[] args) { System.out.println("Main begin!"); // 默认情况下mainThread是普通线程 Thread mainThread = new MainThread(); // 启动mainThread线程 mainThread.start(); try { Thread.sleep(500); } catch (InterruptedException e1) { e1.printStackTrace(); } System.out.println("Main end!"); } }
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