100分求教一个简单的问题,各位速来拿分.

你在这个程序中到底想干什么？
你的wait();中没有用synchronized先取得this的lock
而且你只要你wait了，根本就不会运行到notify中。所以你的代码应该是有问题的
(不要以为一个notify就会唤醒所有的线程，它只会唤醒自己而已)

解决方案 »

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是hehe
异常里的输出结果阿.
agree with chdw, but one point I have to clear that notify() is not to wake yourself, it's not sure which thread is waked up when you call notify().
呵呵，诸位不要瞎猜了，一个简单的数组越界居然没人能看得出来。
id==2
turn%3
i<3
就全搞定了，看来这里实在没什么高手可言了。
佩服佩服，看看下面程序有什么问题！
package com.dt.dps.sbgl.codebase;
/**
*
*                -  File Name : [FILE_NAME][FILE_EXTENSION]  -
*
* ==========================================================================
*
* - Description
*
*    This file has no description yet.
*
* - What's new !
*
*    No update valid.
*
* ==========================================================================
*
*
* - File Author       :    Wafer. W.  £¨Îº ·æ£©
*
* - Last Modification :    [DATE_TEXT]
*
* - Current Version   :    Ver 1.0
*
* - Copyright (C)2002 Wafer All rights reserved.
*
* - Licensed under GNU LGPL (www.gnu.org)
*
* ==========================================================================
* The Wafer Software License, Version 1.1
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in
*    the documentation and/or other materials provided with the
*    distribution.
*
* 3. The end-user documentation included with the redistribution,
*    if any, must include the following acknowledgment:
*       "This product includes software developed by wafer (Îº·æ£©."
*    Alternately, this acknowledgment may appear in the software itself,
*    if and wherever such third-party acknowledgments normally appear.
*
*/import com.dt.dps.sbgl.jscs.*;
import com.dt.dps.sbgl.util.*;
import com.dt.dps.sbgl.iterator.*;
import java.sql.*;public class SbVoltageGrade {
  private String voltageBm;
  private String voltageMc;
  private Double sortField;
  private boolean isModfy=false;
  private LogWriter logwriter;
  private static final String INSERT =
        "INSERT INTO sb_user.sb_voltage_grade_table_m VALUES (?,?,?)";
  private static final String UPDATE =
        "UPDATE sb_user.sb_voltage_grade_table_m SET VOLTAGE_MC=? WHERE VOLTAGE_BM=?,SORT_FIELD=?";
  private static final String DELETE =
        "DELETE FROM sb_user.sb_voltage_grade_table_m WHERE VOLTAGE_BM=?";
  private static final String GET_BYKEY =
        "SELECT VOLTAGE_MC,SORT_FIELD FROM sb_user.sb_voltage_grade_table_m WHERE VOLTAGE_BM=? ";

  /** DATABASE QUERIES **/
    private static final String GET_ALL =
        "SELECT VOLTAGE_BM FROM sb_user.sb_voltage_grade_table_m ";

  public SbVoltageGrade(String voltageBm) throws SbNotFoudException {
   this.logwriter=new LogWriter(this);
   PreparedStatement pstmt=null;
    java.sql.Connection conn=null;
    java.sql.ResultSet rs=null;
    try{ conn=this.getConnection();
         pstmt=conn.prepareStatement(GET_BYKEY);
         pstmt.setString(1,voltageBm);
         rs=pstmt.executeQuery();
         if (rs.next()) {
          this.voltageBm=voltageBm;
          this.voltageMc=rs.getString("VOLTAGE_MC");
            this.sortField=new Double(rs.getDouble("SORT_FIELD"));
         }else{
           this.logwriter.log("not find this item:"+voltageBm+":from sb_user.sb_voltage_grade_table_m",
             this.logwriter.INFO);
           throw new SbNotFoudException("ÔÚµçÑ¹µÈ¼¶±àÂë±íÃ»ÓÐÕÒµ½¸ÃÏî£º"+voltageBm);
         }
    }catch(SQLException e){
       this.logwriter.log("error when select by voltageBm from sb_user.sb_voltage_grade_table_m"+e.getMessage(),
         this.logwriter.ERROR);
    }finally{
       rs=null;
       //ÊÍ·ÅÊý¾Ý¿âÁ¬½Ó
       this.freeConnection(pstmt,conn);
    }

  }
  public SbVoltageGrade(String voltageBm, String voltageMc, Double sortField) throws
    SbAlreadyExistException {
    this.voltageBm = voltageBm;
    this.voltageMc = voltageMc;
    this.sortField = sortField;
    insert();
  }
/*
  public SbVoltageGrade(String voltageBm,String voltageMc) {
    SbVoltageGrade(voltageBm,voltageMc, null);
  }
  */
  public String getVoltageBm() {
    return voltageBm;
  }
  public String getVoltageMc() {
    return voltageMc;
  }
  public void setVoltageMc(String voltageMc) {
    this.voltageMc = voltageMc;
    this.isModfy=true;
  }
  public Double getSortField() {
    return sortField;
  }
  public void setSortField(Double sortField) {
    this.sortField = sortField;
    this.isModfy=true;
  }
  public static EMIterator findAll() {
    return new SbVoltageGradeIterator(GET_ALL);
  }

  public void commit() {
   if (this.isModfy) {
     PreparedStatement pstmt=null;
      java.sql.Connection conn=null;
      try{
          conn=this.getConnection();          pstmt=conn.prepareStatement(UPDATE);
          pstmt.setString(1,this.voltageMc);
          pstmt.setDouble(2,this.sortField.doubleValue());
          pstmt.setString(3,this.voltageBm);
          pstmt.executeUpdate();
      }catch(Exception e){
        this.logwriter.log("error when update data of sb_user.sb_voltage_grade_table_m:"+e.getMessage(),
          this.logwriter.ERROR);
      }finally{
        //ÊÍ·ÅÊý¾Ý¿âÁ¬½Ó
        this.freeConnection(pstmt,conn);
      }
   }
  }

  public void delete() {
    PreparedStatement pstmt=null;
    java.sql.Connection conn=null;
    try{ conn=this.getConnection();
         pstmt=conn.prepareStatement(DELETE);
         pstmt.setString(1,this.voltageBm);
         pstmt.executeUpdate();
    }catch(Exception e){
       logwriter.log("error when insert data into sb_user.sb_voltage_grade_table_m",
         logwriter.ERROR);
    }finally{
       //ÊÍ·ÅÊý¾Ý¿âÁ¬½Ó
       this.freeConnection(pstmt,conn);
    }
  }

  private void insert() throws SbAlreadyExistException {
    PreparedStatement pstmt=null;
    java.sql.Connection conn=null;
    try{ conn=this.getConnection();
         pstmt=conn.prepareStatement(INSERT);
         pstmt.setString(1,this.voltageBm);
         pstmt.setString(2,this.voltageMc);
         pstmt.setDouble(3,this.sortField.doubleValue());
         pstmt.executeUpdate();
    }catch(Exception e){
       this.logwriter.log("error when insert data into sb_user.sb_voltage_grade_table_m:"+e.getMessage(),
         this.logwriter.ERROR);
    }finally{
       //ÊÍ·ÅÊý¾Ý¿âÁ¬½Ó
       this.freeConnection(pstmt,conn);
    }
  }

  private Connection getConnection() {
    try {
      ConnectionDataBase connectionDataBase=new ConnectionDataBase();
      return connectionDataBase.getConnection();
    }catch (Exception e){
      logwriter.log("this error happen when get the connect from ConnectionDataBase:"+e.getMessage(),
        logwriter.ERROR);
    }
    return null;
  }

  private void freeConnection(PreparedStatement pstmt,java.sql.Connection conn)
  {
   try{
         pstmt.close();
        }
     catch(Exception e){
       logwriter.log("error happen when close the pstmt",
        logwriter.ERROR);
     }
     try
        {
         conn.close();
        }
     catch(Exception e) {
      logwriter.log("error happen when close the dbconnection",
        logwriter.ERROR);
      }
  }
}
呵呵，wafer_w，这两天我没上网，你至于得意成这样吗？DBC！