/**
     * The default rejected execution handler.
     */
    private static final RejectedExecutionHandler defaultHandler =
        new AbortPolicy();

    /**
     * Sets a new handler for unexecutable tasks.
     *
     * @param handler the new handler
     * @throws NullPointerException if handler is null
     * @see #getRejectedExecutionHandler
     */
    public void setRejectedExecutionHandler(RejectedExecutionHandler handler) {
        if (handler == null)
            throw new NullPointerException();
        this.handler = handler;
    }

    /**
     * Returns the current handler for unexecutable tasks.
     *
     * @return the current handler
     * @see #setRejectedExecutionHandler(RejectedExecutionHandler)
     */
    public RejectedExecutionHandler getRejectedExecutionHandler() {
        return handler;
    }

public interface RejectedExecutionHandler{
    //被線程池丟棄的線程處理機制
    public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) ;
}

public static class AbortPolicy implements RejectedExecutionHandler{

    public AbortPolicy(){}
    
    //直接拋出異常
    public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
        throw new RejectedExecutionException("Task"+r.toString()+"rejected from"+executor.toString());
    }
    
}

package com.test;

import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadPoolExecutor;

public class RejectedExecutionHandlerDemo implements RejectedExecutionHandler{

    @Override
    public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
        // TODO Auto-generated method stub
        System.out.println("線程信息"+r.toString()+"被遺棄的線程池："+executor.toString());
    }
    
}