1 files changed, 63 insertions, 0 deletions
diff --git a/javalib/src/main/scala/java/util/concurrent/atomic/AtomicInteger.scala b/javalib/src/main/scala/java/util/concurrent/atomic/AtomicInteger.scala
new file mode 100644
index 0000000..1f24b7b
--- /dev/null
+++ b/javalib/src/main/scala/java/util/concurrent/atomic/AtomicInteger.scala
@@ -0,0 +1,63 @@
+package java.util.concurrent.atomic
+
+class AtomicInteger(private[this] var value: Int)
+    extends Number with Serializable {
+
+  def this() = this(0)
+
+  final def get(): Int = value
+
+  final def set(newValue: Int): Unit =
+    value = newValue
+
+  final def lazySet(newValue: Int): Unit =
+    set(newValue)
+
+  final def getAndSet(newValue: Int): Int = {
+    val old = value
+    value = newValue
+    old
+  }
+
+  final def compareAndSet(expect: Int, update: Int): Boolean = {
+    if (expect != value) false else {
+      value = update
+      true
+    }
+  }
+
+  final def weakCompareAndSet(expect: Int, update: Int): Boolean =
+    compareAndSet(expect, update)
+
+  final def getAndIncrement(): Int =
+    getAndAdd(1)
+
+  final def getAndDecrement(): Int =
+    getAndAdd(-1)
+
+  @inline final def getAndAdd(delta: Int): Int = {
+    val old = value
+    value = old + delta
+    old
+  }
+
+  final def incrementAndGet(): Int =
+    addAndGet(1)
+
+  final def decrementAndGet(): Int =
+    addAndGet(-1)
+
+  @inline final def addAndGet(delta: Int): Int = {
+    val newValue = value + delta
+    value = newValue
+    newValue
+  }
+
+  override def toString(): String =
+    value.toString()
+
+  def intValue(): Int = value
+  def longValue(): Long = value.toLong
+  def floatValue(): Float = value.toFloat
+  def doubleValue(): Double = value.toDouble
+}