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## org.jfree.data.general
Class DefaultValueDataset

    java.lang.Object
      org.jfree.data.general.AbstractDataset
          org.jfree.data.general.DefaultValueDataset

All Implemented Interfaces:
  java.io.ObjectInputValidation, java.io.Serializable, java.lang.Cloneable, Dataset, ValueDataset, Value, org.jfree.util.PublicCloneable

    public class DefaultValueDataset

extends AbstractDataset
implements ValueDataset, java.lang.Cloneable, org.jfree.util.PublicCloneable, java.io.Serializable

A dataset that stores a single value (that is possibly `null`). This class provides a default implementation of the `ValueDataset` interface.

See Also:
  Serialized Form

Constructor Summary
`DefaultValueDataset()` Constructs a new dataset, initially empty.
`DefaultValueDataset(double value)` Creates a new dataset with the specified value.
`DefaultValueDataset(java.lang.Number value)` Creates a new dataset with the specified value.

Method Summary
`boolean` | `equals(java.lang.Object obj)` Tests this dataset for equality with an arbitrary object.
`java.lang.Number` | `getValue()` Returns the value.
`int` | `hashCode()` Returns a hash code.
`void` | `setValue(java.lang.Number value)` Sets the value and sends a `DatasetChangeEvent` to all registered listeners.

Methods inherited from class org.jfree.data.general.AbstractDataset
`addChangeListener, clone, fireDatasetChanged, getGroup, hasListener, notifyListeners, removeChangeListener, setGroup, validateObject`

Methods inherited from class java.lang.Object
`finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface org.jfree.data.general.Dataset
`addChangeListener, getGroup, removeChangeListener, setGroup`

Methods inherited from interface org.jfree.util.PublicCloneable
`clone`

Constructor Detail

### DefaultValueDataset

    public DefaultValueDataset()

  Constructs a new dataset, initially empty.

### DefaultValueDataset

    public DefaultValueDataset(double value)

  Creates a new dataset with the specified value.

  Parameters:
    `value` - the value.

### DefaultValueDataset

    public DefaultValueDataset(java.lang.Number value)

  Creates a new dataset with the specified value.

  Parameters:
    `value` - the initial value (`null` permitted).

Method Detail

### getValue

    public java.lang.Number getValue()

  Returns the value.

  Specified by:
    `getValue` in interface `Value`
  Returns:
    The value (possibly `null`).

### setValue

    public void setValue(java.lang.Number value)

  Sets the value and sends a `DatasetChangeEvent` to all registered listeners.

  Parameters:
    `value` - the new value (`null` permitted).

### equals

    public boolean equals(java.lang.Object obj)

  Tests this dataset for equality with an arbitrary object.

  Overrides:
    `equals` in class `java.lang.Object`
  Parameters:
    `obj` - the object (`null` permitted).
  Returns:
    A boolean.

### hashCode

    public int hashCode()

  Returns a hash code.

  Overrides:
    `hashCode` in class `java.lang.Object`
  Returns:
    A hash code.

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