CoderResult (Java Platform SE 8 )

java.lang.Object
- java.nio.charset.CoderResult

```
public class CoderResult
extends Object
```
A description of the result state of a coder.
A charset coder, that is, either a decoder or an encoder, consumes bytes (or characters) from an input buffer, translates them, and writes the resulting characters (or bytes) to an output buffer. A coding process terminates for one of four categories of reasons, which are described by instances of this class:
- Underflow is reported when there is no more input to be processed, or there is insufficient input and additional input is required. This condition is represented by the unique result object UNDERFLOW, whose isUnderflow method returns true.
- Overflow is reported when there is insufficient room remaining in the output buffer. This condition is represented by the unique result object OVERFLOW, whose isOverflow method returns true.
- A malformed-input error is reported when a sequence of input units is not well-formed. Such errors are described by instances of this class whose isMalformed method returns true and whose length method returns the length of the malformed sequence. There is one unique instance of this class for all malformed-input errors of a given length.
- An unmappable-character error is reported when a sequence of input units denotes a character that cannot be represented in the output charset. Such errors are described by instances of this class whose isUnmappable method returns true and whose length method returns the length of the input sequence denoting the unmappable character. There is one unique instance of this class for all unmappable-character errors of a given length.
For convenience, the isError method returns true for result objects that describe malformed-input and unmappable-character errors but false for those that describe underflow or overflow conditions.
Since:

1.4

Field Summary

Fields
Modifier and Type	Field	Description
`static CoderResult`	`OVERFLOW`	Result object indicating overflow, meaning that there is insufficient room in the output buffer.
`static CoderResult`	`UNDERFLOW`	Result object indicating underflow, meaning that either the input buffer has been completely consumed or, if the input buffer is not yet empty, that additional input is required.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`isError()`	Tells whether or not this object describes an error condition.
`boolean`	`isMalformed()`	Tells whether or not this object describes a malformed-input error.
`boolean`	`isOverflow()`	Tells whether or not this object describes an overflow condition.
`boolean`	`isUnderflow()`	Tells whether or not this object describes an underflow condition.
`boolean`	`isUnmappable()`	Tells whether or not this object describes an unmappable-character error.
`int`	`length()`	Returns the length of the erroneous input described by this object (optional operation).
`static CoderResult`	`malformedForLength(int length)`	Static factory method that returns the unique object describing a malformed-input error of the given length.
`void`	`throwException()`	Throws an exception appropriate to the result described by this object.
`String`	`toString()`	Returns a string describing this coder result.
`static CoderResult`	`unmappableForLength(int length)`	Static factory method that returns the unique result object describing an unmappable-character error of the given length.

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

- Field Detail
  - UNDERFLOW
```
public static final CoderResult UNDERFLOW
```
    Result object indicating underflow, meaning that either the input buffer has been completely consumed or, if the input buffer is not yet empty, that additional input is required.
  - OVERFLOW
```
public static final CoderResult OVERFLOW
```
    Result object indicating overflow, meaning that there is insufficient room in the output buffer.
- Method Detail
  - toString
```
public String toString()
```
    Returns a string describing this coder result.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    A descriptive string
  - isUnderflow
```
public boolean isUnderflow()
```
    Tells whether or not this object describes an underflow condition.
    
    Returns:
    
    true if, and only if, this object denotes underflow
  - isOverflow
```
public boolean isOverflow()
```
    Tells whether or not this object describes an overflow condition.
    
    Returns:
    
    true if, and only if, this object denotes overflow
  - isError
```
public boolean isError()
```
    Tells whether or not this object describes an error condition.
    
    Returns:
    
    true if, and only if, this object denotes either a malformed-input error or an unmappable-character error
  - isMalformed
```
public boolean isMalformed()
```
    Tells whether or not this object describes a malformed-input error.
    
    Returns:
    
    true if, and only if, this object denotes a malformed-input error
  - isUnmappable
```
public boolean isUnmappable()
```
    Tells whether or not this object describes an unmappable-character error.
    
    Returns:
    
    true if, and only if, this object denotes an unmappable-character error
  - length
```
public int length()
```
    Returns the length of the erroneous input described by this object (optional operation).
    
    Returns:
    
    The length of the erroneous input, a positive integer
    
    Throws:
    
    UnsupportedOperationException - If this object does not describe an error condition, that is, if the isError does not return true
  - malformedForLength
```
public static CoderResult malformedForLength(int length)
```
    Static factory method that returns the unique object describing a malformed-input error of the given length.
    
    Parameters:
    
    length - The given length
    
    Returns:
    
    The requested coder-result object
  - unmappableForLength
```
public static CoderResult unmappableForLength(int length)
```
    Static factory method that returns the unique result object describing an unmappable-character error of the given length.
    
    Parameters:
    
    length - The given length
    
    Returns:
    
    The requested coder-result object
  - throwException
```
public void throwException()
                    throws CharacterCodingException
```
    Throws an exception appropriate to the result described by this object.
    
    Throws:
    
    BufferUnderflowException - If this object is UNDERFLOW
    
    BufferOverflowException - If this object is OVERFLOW
    
    MalformedInputException - If this object represents a malformed-input error; the exception's length value will be that of this object
    
    UnmappableCharacterException - If this object represents an unmappable-character error; the exceptions length value will be that of this object
    
    CharacterCodingException

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2025, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.

Class CoderResult

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

UNDERFLOW

OVERFLOW

Method Detail

toString

isUnderflow

isOverflow

isError

isMalformed

isUnmappable

length

malformedForLength

unmappableForLength

throwException