Java Byte Code when getting from array

gistfile1.java

class HashBasedMutexProvider {
  private static final int DEFAULT_DISPERSION = 1000;
  private List<Object> mutexes = new ArrayList<Object>();
  private int dispersion;

  HashBasedMutexProvider() {
    this(DEFAULT_DISPERSION);
  }

  HashBasedMutexProvider(int dispersion) {
    this.dispersion = dispersion;
    for (int i = 0; i < dispersion; i++) {
      mutexes.add(new Object());
    }
  }

  Object get(Object key) {
    return mutexes.get(Math.abs(key.hashCode() % dispersion));
  }
}

java.lang.Object get(java.lang.Object key);
   0  aload_0 [this]
   Stack [this] Array [this, key value]
   
   1  getfield com.github.brighttp.HashBasedMutexProvider.mutexes : java.util.List [29]
   Stack [mutexes ref] Array [this, key value]
   
   4  aload_1 [key]
   Stack [key value, mutexes ref] Array [this, key value]
   
   5  invokevirtual java.lang.Object.hashCode() : int [42]
   Stack [hashcode value, mutexes ref] Array [this, key value]
   
   8  aload_0 [this]
   Stack [this, hashcode value, mutexes ref] Array [this, key value]
   
   9  getfield com.github.brighttp.HashBasedMutexProvider.dispersion : int [31]
   Stack [dispersion value, hashcode value, mutexes] Array [this, key value]
   
   12  irem
   Stack ["dispersion % hashcode" value, mutexes] Array [this, key value]
   
   13  invokestatic java.lang.Math.abs(int) : int [46]
   Stack [abs(v) value, mutexes] Array [this, key value]
   
  16  invokeinterface java.util.List.get(int) : java.lang.Object [52] [nargs: 2]
  Stack [one item on list] Array [this, key value]
  
  21  areturn