Java snippet (simple) if statements and return doesnt work

Why isn’t the following code working as expected in my Java Snippet (simple) node in KNIME? It seems to be completely non-functional, as all the rows in the ‘cat’ variable are empty. Could someone please help identify any potential errors in my approach? I’m using this code in a Java Snippet (simple) node. Here is the database structure I’m working with:

col1 = a,a,b,b,b,c,c,c,a,b,c

col2 = 01,01,02,02,03,03,01,01,02,02,03

cat =

// Define the groups g1 and g2 as arrays
String[] g1 = {"a", "b"};
String[] g2 = {"01", "02"};
// Get the current values of columns col1 and col2
String col1 = $col1$;
String col2 = $col2$;
// Check if col1 is in group g1
boolean col1InG1 = false;
for (String value : g1) {
if (value.equals(col1)) {
col1InG1 = true;
break;
}
}
// Check if col2 is in group g2
boolean col2InG2 = false;
for (String value : g2) {
if (value.equals(col2)) {
col2InG2 = true;
break;
}
}
// Assign values to cat based on conditions
if (col1InG1 && col2InG2) {
return $cat$ = "both";
} else if (col1InG1) {
return $cat$ = "only one";
} else if (col2InG2) {
return $cat$ = "only two";
} else {
return $cat$ = "none";
}