java.lang.Object
- com.blackrook.expression.ExpressionStack

```
public class ExpressionStack
extends Object
```
A calculation stack for expression calculation.

Author:

Matthew Tropiano

Field Summary

Fields
Modifier and Type Field Description

static int DEFAULT_CAPACITY
Default capacity.

Constructor Summary

Constructors
Constructor Description

ExpressionStack()
Creates a stack with a default size.

ExpressionStack(int capacity)
Creates a context with a default size.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`clear()`	Clears the context.
`boolean`	`isEmpty()`
`ExpressionValue`	`peek()`	Peeks at a value on the top of the stack.
`ExpressionValue`	`pop()`	Pops a value off the stack.
`void`	`push(boolean value)`	Pushes a value onto the stack.
`void`	`push(double value)`	Pushes a value onto the stack.
`void`	`push(long value)`	Pushes a value onto the stack.
`void`	`push(ExpressionValue value)`	Pushes a value onto the stack.
`int`	`size()`
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - DEFAULT_CAPACITY
```
public static final int DEFAULT_CAPACITY
```
    Default capacity.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - ExpressionStack
```
public ExpressionStack()
```
    Creates a stack with a default size.
    
    See Also:
    
    DEFAULT_CAPACITY
  - ExpressionStack
```
public ExpressionStack(int capacity)
```
    Creates a context with a default size.
    
    Parameters:
    
    capacity - the initial capacity.
- Method Detail
  - push
```
public void push(boolean value)
```
    Pushes a value onto the stack.
    
    Parameters:
    
    value - the value to push.
  - push
```
public void push(long value)
```
    Pushes a value onto the stack.
    
    Parameters:
    
    value - the value to push.
  - push
```
public void push(double value)
```
    Pushes a value onto the stack.
    
    Parameters:
    
    value - the value to push.
  - push
```
public void push(ExpressionValue value)
```
    Pushes a value onto the stack.
    
    Parameters:
    
    value - the value to push.
  - pop
```
public ExpressionValue pop()
```
    Pops a value off the stack.
    
    Returns:
    
    the value at the top of the stack, or null if none left.
  - peek
```
public ExpressionValue peek()
```
    Peeks at a value on the top of the stack.
    
    Returns:
    
    the value at the top of the stack, or null if none left.
  - clear
```
public void clear()
```
    Clears the context.
  - size
```
public int size()
```
    Returns:
    
    the stack size.
  - isEmpty
```
public boolean isEmpty()
```
    Returns:
    
    true if the stack is empty, false if not.
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object

Constructor	Description
`ExpressionStack()`	Creates a stack with a default size.
`ExpressionStack(int capacity)`	Creates a context with a default size.

Class ExpressionStack

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT_CAPACITY

Constructor Detail

ExpressionStack

ExpressionStack

Method Detail

push

push

push

push

pop

peek

clear

size

isEmpty

toString