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分享看看这个程序，到底是为什么？？在同一个类中不能调用方法
import java.io.*;
import java.net.*;
import java.sql.*;
public class simplesqlserver
{
boolean check(String num) {
int i,j;
String strTemp;
strTemp="0123456789+'_'";
if (num.length()== 0)
return false;
for (i=1;i<num.length();i++)
{
j=strTemp.indexOf(num.charAt(i));
if (j==-1)
{
return false;
}
}
return true;
}
public static void main(String args[])
{
Socket clientSocket;
ServerSocket serverSocket;
PrintStream ps;
BufferedReader br;
String inString="";
Connection con;
Statement bb;
ResultSet rs;
BufferedWriter bw;
try{
serverSocket=new ServerSocket(8888);
clientSocket=serverSocket.accept();
br=new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
bw=new BufferedWriter(new OutputStreamWriter(clinetSocket.getOutputStream()));
inString=br.readLine();
if(check(inString))
{ ps.println(inString); }
else
{ System.out.println("此表名无效，请重新输入！"); }
Class.forName("oracle.jdbc.driver.OracleDriver");
con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:oracle","scott","tiger");
bb=con.createStatement();
bb.executeUpdate("drop table "+inString+"");
System.out.println("Table"+inString+" droped");
("create table "+inString+"(empid integer,name varchar(20),dept number(4))");
System.out.println("Table"+inString+" created");
bb.executeUpdate("insert into "+inString+" values(1,'myboy',1423)");
System.out.println("Number of rows inserted=1");
bb.executeUpdate("delete "+inString+" where empid=1");
System.out.println("Number of rows deleted=1");
bb.close();
con.close();
br.close(); }
catch(IOException es) {}
catch(ClassNotFoundException ed) {}
catch(SQLException e)
{
System.out.println(e.getErrorCode());
if(e.getErrorCode()==903 ||e.getErrorCode()==911 ||e.getErrorCode()==922 ||e.getErrorCode()==942 )
{
try{
Class.forName("oracle.jdbc.driver.OracleDriver");
con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:oracle","scott","tiger");
bb=con.createStatement();
System.out.println("Table"+inString.toString()+" has been a table!");
System.out.println("create table "+inString.toString()+"(empid integer,name varchar(20),dept number(4))");
bb.executeUpdate("create table "+inString+" (empid integer,name varchar(20),dept number(4))");
System.out.println("Table"+inString.toString()+" created");
bb.executeUpdate("insert into "+inString.toString()+" values(1,'myboy',1423)");
System.out.println("Number of rows inserted=1");
bb.executeUpdate("delete "+inString.toString()+" where empid=1");
System.out.println("Number of rows deleted=1"); }
catch(SQLException ex){ System.out.println(ex); }
catch(Exception ea) { System.out.println(ea); }
}
}
}
}
调用if(check(inString))时出错，说找不到check，请指点！！
import java.net.*;
import java.sql.*;
public class simplesqlserver
{
boolean check(String num) {
int i,j;
String strTemp;
strTemp="0123456789+'_'";
if (num.length()== 0)
return false;
for (i=1;i<num.length();i++)
{
j=strTemp.indexOf(num.charAt(i));
if (j==-1)
{
return false;
}
}
return true;
}
public static void main(String args[])
{
Socket clientSocket;
ServerSocket serverSocket;
PrintStream ps;
BufferedReader br;
String inString="";
Connection con;
Statement bb;
ResultSet rs;
BufferedWriter bw;
try{
serverSocket=new ServerSocket(8888);
clientSocket=serverSocket.accept();
br=new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
bw=new BufferedWriter(new OutputStreamWriter(clinetSocket.getOutputStream()));
inString=br.readLine();
if(check(inString))
{ ps.println(inString); }
else
{ System.out.println("此表名无效，请重新输入！"); }
Class.forName("oracle.jdbc.driver.OracleDriver");
con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:oracle","scott","tiger");
bb=con.createStatement();
bb.executeUpdate("drop table "+inString+"");
System.out.println("Table"+inString+" droped");
("create table "+inString+"(empid integer,name varchar(20),dept number(4))");
System.out.println("Table"+inString+" created");
bb.executeUpdate("insert into "+inString+" values(1,'myboy',1423)");
System.out.println("Number of rows inserted=1");
bb.executeUpdate("delete "+inString+" where empid=1");
System.out.println("Number of rows deleted=1");
bb.close();
con.close();
br.close(); }
catch(IOException es) {}
catch(ClassNotFoundException ed) {}
catch(SQLException e)
{
System.out.println(e.getErrorCode());
if(e.getErrorCode()==903 ||e.getErrorCode()==911 ||e.getErrorCode()==922 ||e.getErrorCode()==942 )
{
try{
Class.forName("oracle.jdbc.driver.OracleDriver");
con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:oracle","scott","tiger");
bb=con.createStatement();
System.out.println("Table"+inString.toString()+" has been a table!");
System.out.println("create table "+inString.toString()+"(empid integer,name varchar(20),dept number(4))");
bb.executeUpdate("create table "+inString+" (empid integer,name varchar(20),dept number(4))");
System.out.println("Table"+inString.toString()+" created");
bb.executeUpdate("insert into "+inString.toString()+" values(1,'myboy',1423)");
System.out.println("Number of rows inserted=1");
bb.executeUpdate("delete "+inString.toString()+" where empid=1");
System.out.println("Number of rows deleted=1"); }
catch(SQLException ex){ System.out.println(ex); }
catch(Exception ea) { System.out.println(ea); }
}
}
}
}
调用if(check(inString))时出错，说找不到check，请指点！！
...全文
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imagex 2003-10-17
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static boolean check（）
LuZhou 2003-10-17
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static boolean check（）
wellsoon 2003-10-17
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要么如楼上所说，要么:
public static void main(String args[])
{
simplesqlserver newclass= new simplesqlserver();
newclass.check();
.......
}
public static void main(String args[])
{
simplesqlserver newclass= new simplesqlserver();
newclass.check();
.......
}
LoveRose 2003-10-17
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用static声明的函数只能调用static声明的函数和变量
你的程序中public static void main（） 不能调用boolean check（）
必须把check（）声明为 static boolean check（）
你的程序中public static void main（） 不能调用boolean check（）
必须把check（）声明为 static boolean check（）
