public class Test {
public static void main(String args[]){
    try{
        Class.forName("com.mysql.jdbc.Driver");
        Connection con=(Connection) DriverManager.getConnection(
        "jdbc:mysql://localhost:3306/example??useUnicode=yes&characterEncoding=UTF-8","root","");
         String sql = "insert into test testname=?";
         PreparedStatement pstmt = (PreparedStatement) con.prepareStatement(sql);
         pstmt.setString(1, "~!@#$%^&*()_+|=-,.[}<>?{]".toString());
         pstmt.executeUpdate();
         con.close();
    }catch(Exception e){
        System.out.println(e);
        e.printStackTrace();
    }
}

java.sql.SQLException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'testname='~!@#$%^&*()_+|=-,.[}<>?{]'' at line 1
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2847)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1531)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1622)
at com.mysql.jdbc.Connection.execSQL(Connection.java:2376)
at com.mysql.jdbc.Connection.execSQL(Connection.java:2297)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1860)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1957)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1880)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1741)
at me.cs.java.test.Test.main(Test.java:16)
java.sql.SQLException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'testname='~!@#$%^&*()_+|=-,.[}<>?{]'' at line 1