Java多線程問題--線程運行時出現異常的解決辦法

本文內容部分引自《Java多線程編程核心技術》，感謝作者！！！

代碼地址：https://github.com/xianzhixianzhixian/thread.git

線程運行時出現問題的幾種解決辦法

1、爲特定線程指定一個異常處理器

thread.setUncaughtException(new UncaughtExceptionHandler(){
    @Override
    public void uncaughtException(Thread t, Threowable e) {
        //這裏是對特定線程異常的處理
    }

})

2、爲所有線程指定默認的異常處理器

Thread.setDefaultUncaughtExceptionHandler(new UncaughtExceptionHandler(){
    @override
    public void uncaughtException(Thread t, Throwable e) {
        //此處處理所有線程的異常
    }
});

代碼示例

MyThread.java

/**
 * 異常在線程之間的傳遞
 * @author: xianzhixianzhixian
 * @date: 2019-02-28 22:38
 */
public class MyThread extends Thread {
    private String num = "a";

    public MyThread() {
        super();
    }

    public MyThread(ThreadGroup group, String name) {
        super(group, name);
    }

    @Override
    public void run() {
        int numInt = Integer.parseInt(num);
        System.out.println("在線程中打印："+ (numInt+1));
    }
}

爲特定線程指定異常處理器

ObjectUncaughtExceptionHandler.java

/**
 * @author: xianzhixianzhixian
 * @date: 2019-02-28 22:42
 */
public class ObjectUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler {
    @Override
    public void uncaughtException(Thread t, Throwable e) {
        System.out.println("對象的異常處理");
        e.printStackTrace();
    }
}

Run.java

public class Run0 {
    public static void main(String[] args) {
        MyThread myThread = new MyThread();
        myThread.setUncaughtExceptionHandler(new ObjectUncaughtExceptionHandler());
        myThread.start();
    }
}

運行結果：線程運行出現拋異常時，被指定的異常捕獲器捕獲

 

爲所有線程指定默認的異常處理器

StateUncaughtExceptionHandler.java

/**
 * @author: xianzhixianzhixian
 * @date: 2019-02-28 22:43
 */
public class StateUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler {
    @Override
    public void uncaughtException(Thread t, Throwable e) {
        System.out.println("靜態的異常處理");
        e.printStackTrace();
    }
}

Run.java

/**
 * @author: xianzhixianzhixian
 * @date: 2019-02-28 22:43
 */
public class Run1 {
    public static void main(String[] args) {
        MyThread myThread = new MyThread();
        MyThread.setDefaultUncaughtExceptionHandler(new StateUncaughtExceptionHandler());
        myThread.start();
    }
}

運行結果：線程運行出現異常時被默認的異常處理器捕獲