missing return statement

Void Load_group(){
int i=0,Length;
try{
Class.forName("com.mysql.jdbc.Driver"); }
catch(ClassNotFoundException e)
{ System.out.println(e.getMessage());}
try{
con=DriverManager.getConnection(url,"root","");
stmt=con.createStatement();
rs=stmt.executeQuery("SELECT COUNT(1) FROM "+aa3.Table_name);
rs.next();
i=rs.getInt(1);
} catch(SQLException e1) {}
try{
String Length1;
con1=DriverManager.getConnection(url,"root","");
stmt1=con1.createStatement();
rs1=stmt1.executeQuery("SELECT * FROM length_info where Table_name='" +aa3.Table_name+"'");
rs1.next();
Length1=rs1.getString("Length");
Length=Integer.parseInt(Length1);
} catch(SQLException e1) {}
int j=0;
JCheckBox JCheckBox1[];
JCheckBox1= new JCheckBox[100];

missing@@@@@@@@@@@@@@@@@@ return back 还是return return policy in return return意思 return含义 return checkNick() return 0 return 语句 关于return