Problem using UPDATE command from Java

I am getting an error when I use the following code in my java file and use it in JSP through beans:
sql = " UPDATE SHOPPINGCART SET QUANTITY='"+quant+"' WHERE USERNAME ='"+username"' AND TOYID='"+toyid+"' ";
CM.executeUpdate(sql); //CM is the connection object and I have a method which inturn calls executeUpdate
This is the error
C:\Program Files\Apache Software Foundation\Tomcat 4.1\webapps\DBTest\WEB-INF\cl
asses\user>javac *.java
ToyDBAO.java:124: ';' expected
+"WHERE USERNAME ='"+username"' AND TOYID='"+toyid+"' ";
^
ToyDBAO.java:124: not a statement
+"WHERE USERNAME ='"+username"' AND TOYID='"+toyid+"' ";
^
2 errors
Please reply
Message was edited by:
aniketh_parmar

Now the prob is that its compiling the java file. But when I run the program, an error is caught
sql = " UPDATE SHOPPINGCART SET QUANTITY='"+quant+"' (WHERE USERNAME ='"+username+"' AND TOYID='"+toyid+"')";
This is the error in tomcat window
Message Error:You have an error in your SQL syntax; check the manual that corres
ponds to your MySQL server version for the right syntax to use near '(WHERE USER
NAME ='aniketh_parmar' AND TOYID='3')' at line 1

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--- Code ---
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