diff --git a/Changelog.md b/Changelog.md
index d241177..be5ff27 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,9 +1,11 @@
 # Changelog of versions
 
-###Version 0.4.1
+### Version 0.4.1
 - Changed: ForEach with input now provides input, value instead of value, input, this improves the usage of method references greatly
 - Added: addAll with Array-types in collections.
 - Added: Java Iterator/Iterable support for Stream replacing methods
+- Added: Suppliers.
+- Added: ComputeIfAbsent but value generator is a supplier
 
 ### Version 0.4.0
 - Changed: Iterable specific helper functions were moved out of Iterators and moved into Iterables
diff --git a/README.md b/README.md
index 1832b6f..d07bb37 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,9 @@ But its focus is a different one.
 - SplitIterators
 - Iterators
 - Pairs
+- Unary/Functions
+- Suppliers
+- Bi/Consumers
 
 ## Specialized Functions
 New Specialized functions that were added to increase performance or reduce allocations or Quality Of life.
@@ -43,6 +46,7 @@ To highlight things that may be wanted.
 	- addToAll: Same as addTo but bulkVersion.
 	- removeOrDefault: removes a Element and if not present returns the default value instead of the present value.
 	- mergeAll: BulkVersion of Merge function.
+	- computeIfAbsent: A Supplier based generator that covers a lot more reference method cases
 - Sorted Map:
 	- addAndMoveToFirst/Last (From FastUtil but moved to Interface): Allows to add a element to the first/last position of a sorted Map.
 	- moveToFirst/Last: Moves the desired element at the first/last position of the Map.
diff --git a/src/builder/java/speiger/src/builder/GlobalVariables.java b/src/builder/java/speiger/src/builder/GlobalVariables.java
index f510555..f0adad8 100644
--- a/src/builder/java/speiger/src/builder/GlobalVariables.java
+++ b/src/builder/java/speiger/src/builder/GlobalVariables.java
@@ -147,6 +147,7 @@ public class GlobalVariables
 	{
 		addSimpleMapper("JAVA_PREDICATE", type.isPrimitiveBlocking() ? "" : type.getCustomJDKType().getFileType()+"Predicate");
 		addSimpleMapper("JAVA_CONSUMER", type.isPrimitiveBlocking() ? "" : "java.util.function."+type.getCustomJDKType().getFileType()+"Consumer");
+		addSimpleMapper("JAVA_SUPPLIER", type.isPrimitiveBlocking() ? "" : "java.util.function."+type.getCustomJDKType().getFileType()+"Supplier");
 		addSimpleMapper("JAVA_FUNCTION", type.getFunctionClass(valueType));
 		addSimpleMapper("JAVA_BINARY_OPERATOR", type == ClassType.BOOLEAN ? "" : (type.isObject() ? "java.util.function.BinaryOperator" : "java.util.function."+type.getCustomJDKType().getFileType()+"BinaryOperator"));
 		addSimpleMapper("JAVA_UNARY_OPERATOR", type.isObject() ? "BinaryOperator" : type == ClassType.BOOLEAN ? "" : type.getCustomJDKType().getFileType()+"UnaryOperator");
@@ -225,6 +226,7 @@ public class GlobalVariables
 		addClassMapper("SET", "Set");
 		addClassMapper("STRATEGY", "Strategy");
 		addClassMapper("STACK", "Stack");
+		addClassMapper("SUPPLIER", "Supplier");
 		addBiClassMapper("UNARY_OPERATOR", "UnaryOperator", "");
 		if(type.isObject())
 		{
@@ -275,6 +277,7 @@ public class GlobalVariables
 		addFunctionMapper("GET_KEY", "get");
 		if(type.isObject()) addFunctionValueMapper("GET_VALUE", valueType.isObject() ? "getObject" : "get");
 		else addSimpleMapper("GET_VALUE", "get");
+		addSimpleMapper("GET_JAVA", type.isObject() ? "get" : "getAs"+type.getCustomJDKType().getNonFileType());
 		addFunctionMapper("LAST_KEY", "last");
 		addFunctionValueMapper("MERGE", "merge");
 		addFunctionMapper("NEXT", "next");
diff --git a/src/builder/resources/speiger/assets/collections/templates/functions/Supplier.template b/src/builder/resources/speiger/assets/collections/templates/functions/Supplier.template
new file mode 100644
index 0000000..38856bb
--- /dev/null
+++ b/src/builder/resources/speiger/assets/collections/templates/functions/Supplier.template
@@ -0,0 +1,26 @@
+package speiger.src.collections.PACKAGE.functions;
+
+/**
+ * Type-Specific Supplier interface that reduces (un)boxing and allows to merge other consumer types into this interface
+ * @Type(T)
+ */
+#if TYPE_OBJECT
+public interface SUPPLIER KEY_GENERIC_TYPE extends java.util.function.Supplier<KEY_TYPE>
+#else if JDK_TYPE && !TYPE_BOOLEAN
+public interface SUPPLIER KEY_GENERIC_TYPE extends JAVA_SUPPLIER
+#else
+public interface SUPPLIER KEY_GENERIC_TYPE
+#endif
+{
+	/**
+	 * @return the supplied value
+	 */
+	public KEY_TYPE GET_KEY();
+#if JDK_TYPE && PRIMITIVE
+	
+	@Override
+	public default KEY_TYPE GET_JAVA() {
+		return GET_KEY();
+	}
+#endif
+}
\ No newline at end of file
diff --git a/src/builder/resources/speiger/assets/collections/templates/maps/abstracts/AbstractMap.template b/src/builder/resources/speiger/assets/collections/templates/maps/abstracts/AbstractMap.template
index 897a931..c4bf329 100644
--- a/src/builder/resources/speiger/assets/collections/templates/maps/abstracts/AbstractMap.template
+++ b/src/builder/resources/speiger/assets/collections/templates/maps/abstracts/AbstractMap.template
@@ -18,6 +18,7 @@ import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_COLLECTION;
 import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_ITERATOR;
 import speiger.src.collections.VALUE_PACKAGE.functions.function.VALUE_UNARY_OPERATOR;
 #endif
+import speiger.src.collections.VALUE_PACKAGE.functions.VALUE_SUPPLIER;
 #if !TYPE_OBJECT && !VALUE_OBJECT
 import speiger.src.collections.objects.collections.ObjectIterator;
 #endif
@@ -189,6 +190,20 @@ public abstract class ABSTRACT_MAP KEY_VALUE_GENERIC_TYPE extends AbstractMap<CL
 		return value;
 	}
 	
+	@Override
+	public VALUE_TYPE COMPUTE_IF_ABSENT(KEY_TYPE key, VALUE_SUPPLIER VALUE_GENERIC_TYPE valueProvider) {
+		Objects.requireNonNull(valueProvider);
+		VALUE_TYPE value;
+		if((value = GET_VALUE(key)) == getDefaultReturnValue() || !containsKey(key)) {
+			VALUE_TYPE newValue = valueProvider.VALUE_GET_KEY();
+			if(VALUE_EQUALS_NOT(newValue, getDefaultReturnValue())) {
+				put(key, newValue);
+				return newValue;
+			}
+		}
+		return value;
+	}
+	
 	@Override
 	public VALUE_TYPE COMPUTE_IF_PRESENT(KEY_TYPE key, UNARY_OPERATOR KEY_VALUE_GENERIC_TYPE mappingFunction) {
 		Objects.requireNonNull(mappingFunction);
diff --git a/src/builder/resources/speiger/assets/collections/templates/maps/impl/customHash/OpenCustomHashMap.template b/src/builder/resources/speiger/assets/collections/templates/maps/impl/customHash/OpenCustomHashMap.template
index bb34bd2..6814d51 100644
--- a/src/builder/resources/speiger/assets/collections/templates/maps/impl/customHash/OpenCustomHashMap.template
+++ b/src/builder/resources/speiger/assets/collections/templates/maps/impl/customHash/OpenCustomHashMap.template
@@ -29,6 +29,7 @@ import speiger.src.collections.PACKAGE.sets.SET;
 import speiger.src.collections.PACKAGE.utils.STRATEGY;
 import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_ABSTRACT_COLLECTION;
 import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_COLLECTION;
+import speiger.src.collections.VALUE_PACKAGE.functions.VALUE_SUPPLIER;
 #if !SAME_TYPE
 import speiger.src.collections.VALUE_PACKAGE.functions.function.VALUE_UNARY_OPERATOR;
 #if !VALUE_OBJECT
@@ -495,6 +496,18 @@ public class CUSTOM_HASH_MAP KEY_VALUE_GENERIC_TYPE extends ABSTRACT_MAP KEY_VAL
 		}
 		return values[index];
 	}
+	
+	@Override
+	public VALUE_TYPE COMPUTE_IF_ABSENT(KEY_TYPE key, VALUE_SUPPLIER VALUE_GENERIC_TYPE valueProvider) {
+		int index = findIndex(key);
+		if(index < 0) {
+			VALUE_TYPE newValue = valueProvider.VALUE_GET_KEY();
+			if(VALUE_EQUALS(newValue, getDefaultReturnValue())) return newValue;
+			insert(-index-1, key, newValue);
+			return newValue;
+		}
+		return values[index];
+	}
 
 	@Override
 	public VALUE_TYPE COMPUTE_IF_PRESENT(KEY_TYPE key, UNARY_OPERATOR KEY_VALUE_GENERIC_TYPE mappingFunction) {
diff --git a/src/builder/resources/speiger/assets/collections/templates/maps/impl/hash/OpenHashMap.template b/src/builder/resources/speiger/assets/collections/templates/maps/impl/hash/OpenHashMap.template
index c8bf1ea..77fd7be 100644
--- a/src/builder/resources/speiger/assets/collections/templates/maps/impl/hash/OpenHashMap.template
+++ b/src/builder/resources/speiger/assets/collections/templates/maps/impl/hash/OpenHashMap.template
@@ -28,6 +28,7 @@ import speiger.src.collections.PACKAGE.sets.SET;
 #endif
 import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_ABSTRACT_COLLECTION;
 import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_COLLECTION;
+import speiger.src.collections.VALUE_PACKAGE.functions.VALUE_SUPPLIER;
 #if !SAME_TYPE
 import speiger.src.collections.VALUE_PACKAGE.functions.function.VALUE_UNARY_OPERATOR;
 
@@ -456,7 +457,19 @@ public class HASH_MAP KEY_VALUE_GENERIC_TYPE extends ABSTRACT_MAP KEY_VALUE_GENE
 		}
 		return values[index];
 	}
-
+	
+	@Override
+	public VALUE_TYPE COMPUTE_IF_ABSENT(KEY_TYPE key, VALUE_SUPPLIER VALUE_GENERIC_TYPE valueProvider) {
+		int index = findIndex(key);
+		if(index < 0) {
+			VALUE_TYPE newValue = valueProvider.VALUE_GET_KEY();
+			if(VALUE_EQUALS(newValue, getDefaultReturnValue())) return newValue;
+			insert(-index-1, key, newValue);
+			return newValue;
+		}
+		return values[index];
+	}
+	
 	@Override
 	public VALUE_TYPE COMPUTE_IF_PRESENT(KEY_TYPE key, UNARY_OPERATOR KEY_VALUE_GENERIC_TYPE mappingFunction) {
 		int index = findIndex(key);
diff --git a/src/builder/resources/speiger/assets/collections/templates/maps/impl/immutable/ImmutableOpenHashMap.template b/src/builder/resources/speiger/assets/collections/templates/maps/impl/immutable/ImmutableOpenHashMap.template
index d4dda4f..00272a7 100644
--- a/src/builder/resources/speiger/assets/collections/templates/maps/impl/immutable/ImmutableOpenHashMap.template
+++ b/src/builder/resources/speiger/assets/collections/templates/maps/impl/immutable/ImmutableOpenHashMap.template
@@ -49,6 +49,7 @@ import speiger.src.collections.PACKAGE.sets.SET;
 import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_ABSTRACT_COLLECTION;
 import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_COLLECTION;
 import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_ITERATOR;
+import speiger.src.collections.VALUE_PACKAGE.functions.VALUE_SUPPLIER;
 #if !SAME_TYPE
 import speiger.src.collections.VALUE_PACKAGE.functions.function.VALUE_UNARY_OPERATOR;
 #if !VALUE_OBJECT
@@ -440,7 +441,10 @@ public class IMMUTABLE_HASH_MAP KEY_VALUE_GENERIC_TYPE extends ABSTRACT_MAP KEY_
 	
 	@Override
 	public VALUE_TYPE COMPUTE_IF_ABSENT(KEY_TYPE key, FUNCTION KEY_VALUE_GENERIC_TYPE mappingFunction) { throw new UnsupportedOperationException(); }
-
+	
+	@Override
+	public VALUE_TYPE COMPUTE_IF_ABSENT(KEY_TYPE key, VALUE_SUPPLIER VALUE_GENERIC_TYPE valueProvider) { throw new UnsupportedOperationException(); }
+	
 	@Override
 	public VALUE_TYPE COMPUTE_IF_PRESENT(KEY_TYPE key, UNARY_OPERATOR KEY_VALUE_GENERIC_TYPE mappingFunction) { throw new UnsupportedOperationException(); }
 	
diff --git a/src/builder/resources/speiger/assets/collections/templates/maps/impl/misc/ArrayMap.template b/src/builder/resources/speiger/assets/collections/templates/maps/impl/misc/ArrayMap.template
index 7ace144..843f885 100644
--- a/src/builder/resources/speiger/assets/collections/templates/maps/impl/misc/ArrayMap.template
+++ b/src/builder/resources/speiger/assets/collections/templates/maps/impl/misc/ArrayMap.template
@@ -30,6 +30,7 @@ import speiger.src.collections.PACKAGE.utils.maps.MAPS;
 import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_ABSTRACT_COLLECTION;
 import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_COLLECTION;
 import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_ITERATOR;
+import speiger.src.collections.VALUE_PACKAGE.functions.VALUE_SUPPLIER;
 #if !SAME_TYPE
 import speiger.src.collections.VALUE_PACKAGE.functions.function.VALUE_UNARY_OPERATOR;
 #if !VALUE_OBJECT
@@ -486,7 +487,19 @@ public class ARRAY_MAP KEY_VALUE_GENERIC_TYPE extends ABSTRACT_MAP KEY_VALUE_GEN
 		}
 		return values[index];
 	}
-
+	
+	@Override
+	public VALUE_TYPE COMPUTE_IF_ABSENT(KEY_TYPE key, VALUE_SUPPLIER VALUE_GENERIC_TYPE valueProvider) {
+		int index = findIndex(key);
+		if(index == -1) {
+			VALUE_TYPE newValue = valueProvider.VALUE_GET_KEY();
+			if(VALUE_EQUALS(newValue, getDefaultReturnValue())) return newValue;
+			insertIndex(size++, key, newValue);
+			return newValue;
+		}
+		return values[index];
+	}
+	
 	@Override
 	public VALUE_TYPE COMPUTE_IF_PRESENT(KEY_TYPE key, UNARY_OPERATOR KEY_VALUE_GENERIC_TYPE mappingFunction) {
 		int index = findIndex(key);
diff --git a/src/builder/resources/speiger/assets/collections/templates/maps/impl/tree/AVLTreeMap.template b/src/builder/resources/speiger/assets/collections/templates/maps/impl/tree/AVLTreeMap.template
index 289fbc4..de23311 100644
--- a/src/builder/resources/speiger/assets/collections/templates/maps/impl/tree/AVLTreeMap.template
+++ b/src/builder/resources/speiger/assets/collections/templates/maps/impl/tree/AVLTreeMap.template
@@ -33,6 +33,7 @@ import speiger.src.collections.PACKAGE.utils.maps.MAPS;
 import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_ABSTRACT_COLLECTION;
 import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_COLLECTION;
 import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_ITERATOR;
+import speiger.src.collections.VALUE_PACKAGE.functions.VALUE_SUPPLIER;
 #if !SAME_TYPE
 import speiger.src.collections.VALUE_PACKAGE.functions.function.VALUE_UNARY_OPERATOR;
 import speiger.src.collections.VALUE_PACKAGE.lists.VALUE_LIST_ITERATOR;
@@ -529,6 +530,18 @@ public class AVL_TREE_MAP KEY_VALUE_GENERIC_TYPE extends ABSTRACT_MAP KEY_VALUE_
 		return entry.value;
 	}
 	
+	@Override
+	public VALUE_TYPE COMPUTE_IF_ABSENT(KEY_TYPE key, VALUE_SUPPLIER VALUE_GENERIC_TYPE valueProvider) {
+		Entry KEY_VALUE_GENERIC_TYPE entry = findNode(key);
+		if(entry == null) {
+			VALUE_TYPE newValue = valueProvider.VALUE_GET_KEY();
+			if(VALUE_EQUALS(newValue, getDefaultReturnValue())) return newValue;
+			put(key, newValue);
+			return newValue;
+		}
+		return entry.value;
+	}
+	
 	@Override
 	public VALUE_TYPE COMPUTE_IF_PRESENT(KEY_TYPE key, UNARY_OPERATOR KEY_VALUE_GENERIC_TYPE mappingFunction) {
 		Entry KEY_VALUE_GENERIC_TYPE entry = findNode(key);
diff --git a/src/builder/resources/speiger/assets/collections/templates/maps/impl/tree/RBTreeMap.template b/src/builder/resources/speiger/assets/collections/templates/maps/impl/tree/RBTreeMap.template
index 6ea0e7a..3cb1c8f 100644
--- a/src/builder/resources/speiger/assets/collections/templates/maps/impl/tree/RBTreeMap.template
+++ b/src/builder/resources/speiger/assets/collections/templates/maps/impl/tree/RBTreeMap.template
@@ -33,6 +33,7 @@ import speiger.src.collections.PACKAGE.utils.maps.MAPS;
 import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_ABSTRACT_COLLECTION;
 import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_COLLECTION;
 import speiger.src.collections.VALUE_PACKAGE.collections.VALUE_ITERATOR;
+import speiger.src.collections.VALUE_PACKAGE.functions.VALUE_SUPPLIER;
 #if !SAME_TYPE
 import speiger.src.collections.VALUE_PACKAGE.functions.function.VALUE_UNARY_OPERATOR;
 import speiger.src.collections.VALUE_PACKAGE.lists.VALUE_LIST_ITERATOR;
@@ -528,6 +529,18 @@ public class RB_TREE_MAP KEY_VALUE_GENERIC_TYPE extends ABSTRACT_MAP KEY_VALUE_G
 		return entry.value;
 	}
 	
+	@Override
+	public VALUE_TYPE COMPUTE_IF_ABSENT(KEY_TYPE key, VALUE_SUPPLIER VALUE_GENERIC_TYPE valueProvider) {
+		Entry KEY_VALUE_GENERIC_TYPE entry = findNode(key);
+		if(entry == null) {
+			VALUE_TYPE newValue = valueProvider.VALUE_GET_KEY();
+			if(VALUE_EQUALS(newValue, getDefaultReturnValue())) return newValue;
+			put(key, newValue);
+			return newValue;
+		}
+		return entry.value;
+	}
+	
 	@Override
 	public VALUE_TYPE COMPUTE_IF_PRESENT(KEY_TYPE key, UNARY_OPERATOR KEY_VALUE_GENERIC_TYPE mappingFunction) {
 		Entry KEY_VALUE_GENERIC_TYPE entry = findNode(key);
diff --git a/src/builder/resources/speiger/assets/collections/templates/maps/interfaces/Map.template b/src/builder/resources/speiger/assets/collections/templates/maps/interfaces/Map.template
index 1735312..c175dd0 100644
--- a/src/builder/resources/speiger/assets/collections/templates/maps/interfaces/Map.template
+++ b/src/builder/resources/speiger/assets/collections/templates/maps/interfaces/Map.template
@@ -33,6 +33,7 @@ import speiger.src.collections.PACKAGE.sets.SET;
 #if !SAME_TYPE
 import speiger.src.collections.VALUE_PACKAGE.functions.function.VALUE_UNARY_OPERATOR;
 #endif
+import speiger.src.collections.VALUE_PACKAGE.functions.VALUE_SUPPLIER;
 import speiger.src.collections.objects.collections.ObjectIterator;
 #if !TYPE_OBJECT
 import speiger.src.collections.objects.sets.ObjectSet;
@@ -267,6 +268,14 @@ public interface MAP KEY_VALUE_GENERIC_TYPE extends Map<CLASS_TYPE, CLASS_VALUE_
 	 * @return the result of the computed value or present value
 	 */
 	public VALUE_TYPE COMPUTE_IF_ABSENT(KEY_TYPE key, FUNCTION KEY_VALUE_GENERIC_TYPE mappingFunction);
+	
+	/**
+	 * A Supplier based computeIfAbsent function to fill the most used usecase of this function
+	 * @param key the key that should be computed
+	 * @param valueProvider the value if not present
+	 * @return the result of the computed value or present value
+	 */	
+	public VALUE_TYPE COMPUTE_IF_ABSENT(KEY_TYPE key, VALUE_SUPPLIER VALUE_GENERIC_TYPE valueProvider);
 	/**
 	 * A Type Specific compute method to reduce boxing/unboxing
 	 * @param key the key that should be computed