if flag java_关于JAVA，谁知道这是怎么回事啊，在代码if(ant_flag=="true") flag=true;中，我读出来ant_flag是true...

为什么if(ant_flag=="true")判断不能对flag进行true赋值呢？谢谢啊Stringsql="select*fromRFIDwhereepc='"+epc+"'";try{Class.forName(driverName);conn=DriverManager.getConnection...

为什么if(ant_flag=="true")判断不能对flag进行true赋值呢？谢谢啊

String sql="select * from RFID where epc='"+epc+"'";

try {

Class.forName(driverName);

conn = DriverManager.getConnection(dbURL, userName, userPwd);

System.out.println("Connection Successful!"); //如果连接成功 控制台输出Connection Successful!

java.sql.Statement cmd =conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);

String strSql=sql;

ResultSet rs;

rs=cmd.executeQuery(strSql);

if(rs.next())

{

ant_flag = rs.getString(""+str_flag+"");

}

if(ant_flag=="true")

flag=true;

cmd.close();

conn.close();

}catch (Exception e) {

e.printStackTrace();

System.out.println(e.getMessage());

}

return flag;

展开