Package org.zkoss.zel

## Class Expression

- java.lang.Object
- - org.zkoss.zel.Expression

- All Implemented Interfaces:
    `java.io.Serializable`
  Direct Known Subclasses:
    `MethodExpression`, `ValueExpression`

      public abstract class Expression
      extends java.lang.Object
      implements java.io.Serializable

  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `Expression()` |

  - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `abstract boolean` | `equals​(java.lang.Object obj)` |
    `abstract java.lang.String` | `getExpressionString()` |
    `abstract int` | `hashCode()` |
    `abstract boolean` | `isLiteralText()` |

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### Expression

          public Expression()

  - ### Method Detail

    - #### getExpressionString

          public abstract java.lang.String getExpressionString()

    - #### equals

          public abstract boolean equals​(java.lang.Object obj)

      Overrides:
        `equals` in class `java.lang.Object`

    - #### hashCode

          public abstract int hashCode()

      Overrides:
        `hashCode` in class `java.lang.Object`

    - #### isLiteralText

          public abstract boolean isLiteralText()