Insert Data to database form textfield using java

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Java

Hello .
i am trying to enter information from my texfield1 to MySql database i tried to do this using this code

String str=jTextField1.getText;
Statement s=con.createStatment();
s.execute("insert into School (Id,Name,Address)values(str,'Mark','USA')")

but after compiling complete it give me sql error in the statements .
did i make something wrong ?
thxx in advance