Thread parent = currentThread(); this.daemon = parent.isDaemon(); public final void setDaemon(boolean on) {
checkAccess(); if (isAlive()) {
throw new IllegalThreadStateException(); } daemon = on; } 例1：thread是用户线程，主线程结束后，thread会继续运行
public static void main(String[] args) throws Exception {
Thread thread = new Thread(new Runnable() {
@Override public void run() {
while (true) {
try {
Thread.sleep(1000L); System.out.println("still running."); } catch (InterruptedException e) {
e.printStackTrace(); } } } }); //设置线程为用户线程 thread.setDaemon(false); thread.start(); Thread.sleep(3000L); System.out.println("主线程退出"); } //输出 still running. still running. 主线程退出 still running. still running. still running. still running. 例2：thread是守护线程，主线程结束后，thread会随即停止
public static void main(String[] args) throws Exception {
Thread thread = new Thread(new Runnable() {
@Override public void run() {
while (true) {
try {
Thread.sleep(1000L); System.out.println("still running."); } catch (InterruptedException e) {
e.printStackTrace(); } } } }); //设置线程为守护线程 thread.setDaemon(true); thread.start(); Thread.sleep(3000L); System.out.println("主线程退出"); } //输出 still running. still running. 主线程退出 版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请联系我们举报，一经查实，本站将立刻删除。
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