diff --git a/src/main/java/PasswordValidator.java b/src/main/java/PasswordValidator.java
new file mode 100644
index 0000000..9cb4f03
--- /dev/null
+++ b/src/main/java/PasswordValidator.java
@@ -0,0 +1,57 @@
+import java.util.regex.Pattern;
+
+public class PasswordValidator {
+    int minLength = 6;
+    boolean requireUppercase = true;
+    boolean requireLowercase = true;
+    boolean requireDigit = true;
+
+    private final Pattern uppercasePattern = Pattern.compile("^(?=.*[A-Z]).+$");
+    private final Pattern lowercasePattern = Pattern.compile("^(?=.*[a-z]).+$");
+    private final Pattern digitPattern = Pattern.compile("^(?=.*\\d).+$");
+
+    public boolean validate(String password) {
+        if (password.length() < minLength) {
+            return false;
+        } else if (requireUppercase && !uppercasePattern.matcher(password).matches()) {
+            return false;
+        } else if (requireLowercase && !lowercasePattern.matcher(password).matches()) {
+            return false;
+        } else if (requireDigit && !digitPattern.matcher(password).matches()) {
+            return false;
+        }
+        return true;
+    }
+
+    public int getMinLength() {
+        return minLength;
+    }
+
+    public void setMinLength(int minLength) {
+        this.minLength = minLength;
+    }
+
+    public boolean isRequireUppercase() {
+        return requireUppercase;
+    }
+
+    public void setRequireUppercase(boolean requireUppercase) {
+        this.requireUppercase = requireUppercase;
+    }
+
+    public boolean isRequireLowercase() {
+        return requireLowercase;
+    }
+
+    public void setRequireLowercase(boolean requireLowercase) {
+        this.requireLowercase = requireLowercase;
+    }
+
+    public boolean isRequireDigit() {
+        return requireDigit;
+    }
+
+    public void setRequireDigit(boolean requireDigit) {
+        this.requireDigit = requireDigit;
+    }
+}
diff --git a/src/test/java/PasswordValidatorTest.java b/src/test/java/PasswordValidatorTest.java
new file mode 100644
index 0000000..78d9335
--- /dev/null
+++ b/src/test/java/PasswordValidatorTest.java
@@ -0,0 +1,50 @@
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class PasswordValidatorTest {
+
+    @Test
+    void validate() {
+        PasswordValidator passwordValidator = new PasswordValidator();
+        assertFalse(passwordValidator.validate(""));
+
+        // test minimum password length
+        passwordValidator.setMinLength(6);
+        passwordValidator.setRequireUppercase(false);
+        passwordValidator.setRequireLowercase(false);
+        passwordValidator.setRequireDigit(false);
+        assertFalse(passwordValidator.validate("abcde"));
+        assertTrue(passwordValidator.validate("abcdef"));
+        assertTrue(passwordValidator.validate("abcdefg"));
+
+        // test uppercase requirement
+        passwordValidator.setRequireUppercase(true);
+        passwordValidator.setRequireLowercase(false);
+        passwordValidator.setRequireDigit(false);
+        assertFalse(passwordValidator.validate("abcdef"));
+        assertTrue(passwordValidator.validate("abCdef"));
+        assertTrue(passwordValidator.validate("ABCDEF"));
+
+        // test lowercase requirement
+        passwordValidator.setRequireUppercase(true);
+        passwordValidator.setRequireLowercase(true);
+        passwordValidator.setRequireDigit(false);
+        assertFalse(passwordValidator.validate("abcdef"));
+        assertTrue(passwordValidator.validate("abCdef"));
+        assertFalse(passwordValidator.validate("ABCDEF"));
+
+        // test digits requirement
+        passwordValidator.setRequireUppercase(true);
+        passwordValidator.setRequireLowercase(true);
+        passwordValidator.setRequireDigit(true);
+        assertFalse(passwordValidator.validate("8"));
+        assertFalse(passwordValidator.validate("12345678"));
+        assertFalse(passwordValidator.validate("abcdef"));
+        assertFalse(passwordValidator.validate("abcdef8"));
+        assertFalse(passwordValidator.validate("abCdef"));
+        assertFalse(passwordValidator.validate("ABCDEF"));
+        assertFalse(passwordValidator.validate("ABCDEF8"));
+        assertTrue(passwordValidator.validate("abCDE8F"));
+    }
+}