diff --git a/src/main/java/xyz/zhouxy/plusone/commons/util/BigDecimals.java b/src/main/java/xyz/zhouxy/plusone/commons/util/BigDecimals.java
index bc1b623..3b6bf78 100644
--- a/src/main/java/xyz/zhouxy/plusone/commons/util/BigDecimals.java
+++ b/src/main/java/xyz/zhouxy/plusone/commons/util/BigDecimals.java
@@ -2,12 +2,40 @@ package xyz.zhouxy.plusone.commons.util;
 
 import java.math.BigDecimal;
 
+import javax.annotation.Nullable;
+
+import org.apache.commons.lang3.StringUtils;
+
+import com.google.common.annotations.Beta;
+import com.google.common.base.Preconditions;
+
 public class BigDecimals {
 
-    public static boolean equals(BigDecimal a, BigDecimal b) {
+    public static final BigDecimal ZERO = new BigDecimal("0.00");
+
+    public static boolean equals(@Nullable BigDecimal a, @Nullable BigDecimal b) {
         return (a == b) || (a != null && a.compareTo(b) == 0);
     }
 
+    @Beta
+    public static boolean greaterThan(BigDecimal a, BigDecimal b) {
+        Preconditions.checkNotNull(a, "Parameter could not be null.");
+        Preconditions.checkNotNull(b, "Parameter could not be null.");
+        return (a != b) && (a.compareTo(b) > 0);
+    }
+
+    @Beta
+    public static boolean lessThan(BigDecimal a, BigDecimal b) {
+        Preconditions.checkNotNull(a, "Parameter could not be null.");
+        Preconditions.checkNotNull(b, "Parameter could not be null.");
+        return (a != b) && (a.compareTo(b) < 0);
+    }
+
+    @Beta
+    public static BigDecimal of(final String val) {
+        return (StringUtils.isBlank(val)) ? ZERO : new BigDecimal(val);
+    }
+
     private BigDecimals() {
         throw new IllegalStateException("Utility class");
     }