*/
    public static int toPrimitiveInt(final Object o) {
        return toPrimitiveInt(o, null);
    }

    /**
     * Converts to {@literal int}.
     *
     * @param o
     *            The object to convert
     * @param pattern
     *            The pattern string
     * @return The converted {@literal int}
     */
    public static int toPrimitiveInt(final Object o, final String pattern) {

     */
    public void testToPrimitiveInt() throws Exception {
        assertEquals(1000, IntegerConversionUtil.toPrimitiveInt("1,000"));
    }

    /**
     * @throws Exception
     */
    public void testToPrimitiveIntForEmptyString() throws Exception {
        assertEquals(0, IntegerConversionUtil.toPrimitiveInt(""));
    }

    /**
     * @throws Exception
     */

Boolean flag = BooleanConversionUtil.toBoolean("true");        // Returns true
Date date = DateConversionUtil.toDate("2023-12-25", "yyyy-MM-dd");

// Primitive conversions with default values
int primitiveInt = IntegerConversionUtil.toPrimitiveInt(value, "0");  // Default to 0 if null
```

### Collection Utilities with Java 21 Support
```java
import org.codelibs.core.collection.CollectionsUtil;
import java.util.SequencedCollection;