sdsu.compare
Class Comparer

java.lang.Object
  |
  +--sdsu.compare.Comparer

Direct Known Subclasses:

DoubleComparer, FloatComparer, IntegerComparer, LetterGradeComparer, LinearOrderComparer, LongComparer, MethodComparer, NumericStringComparer, ReverseOrderComparer, StringComparer, StringIgnoreCaseComparer

public abstract class Comparer

extends java.lang.Object

implements java.io.Serializable

This abstract class defines an interface for comparing objects. You only need to override the compare method, as the default implementation of all other methods use compare. However, for effeciency reasons you may wish to override more than compare.

Version:

1.0 4 June 1997

Author:

Roger Whitney (whitney@cs.sdsu.edu)

See Also:

Serialized Form

Constructor Summary

Comparer()

Method Summary

abstract boolean	equals(java.lang.Object leftOperand, java.lang.Object rightOperand) Returns true if the leftOperand is equal to the rightOperand.
abstract boolean	greaterThan(java.lang.Object leftOperand, java.lang.Object rightOperand) Returns true if the leftOperand is greater than the rightOperand.
boolean	greaterThanOrEqual(java.lang.Object leftOperand, java.lang.Object rightOperand) Returns true if the leftOperand is greater than or equal the rightOperand.
abstract boolean	lessThan(java.lang.Object leftOperand, java.lang.Object rightOperand) Returns true if the leftOperand is less than the rightOperand.
boolean	lessThanOrEqual(java.lang.Object leftOperand, java.lang.Object rightOperand) Returns true if the leftOperand is less than or equal to the rightOperand.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Comparer

public Comparer()

Method Detail

lessThan

public abstract boolean lessThan(java.lang.Object leftOperand,
                                 java.lang.Object rightOperand)
                          throws java.lang.ClassCastException

Returns true if the leftOperand is less than the rightOperand.

Throws:

java.lang.ClassCastException - If operand objects are not proper type. ClassCastException is a RuntimeException, so compiler does not force you to catch this exception.

greaterThan

public abstract boolean greaterThan(java.lang.Object leftOperand,
                                    java.lang.Object rightOperand)
                             throws java.lang.ClassCastException

Returns true if the leftOperand is greater than the rightOperand.

Throws:

java.lang.ClassCastException - If operand objects are not proper type. ClassCastException is a RuntimeException, so compiler does not force you to catch this exception.

equals

public abstract boolean equals(java.lang.Object leftOperand,
                               java.lang.Object rightOperand)
                        throws java.lang.ClassCastException

Returns true if the leftOperand is equal to the rightOperand.

Throws:

java.lang.ClassCastException - If operand objects are not proper type. ClassCastException is a RuntimeException, so compiler does not force you to catch this exception.

lessThanOrEqual

public boolean lessThanOrEqual(java.lang.Object leftOperand,
                               java.lang.Object rightOperand)
                        throws java.lang.ClassCastException

Returns true if the leftOperand is less than or equal to the rightOperand.

Throws:

java.lang.ClassCastException - If operand objects are not proper type. ClassCastException is a RuntimeException, so compiler does not force you to catch this exception.

greaterThanOrEqual

public boolean greaterThanOrEqual(java.lang.Object leftOperand,
                                  java.lang.Object rightOperand)
                           throws java.lang.ClassCastException

Returns true if the leftOperand is greater than or equal the rightOperand.

Throws:

java.lang.ClassCastException - If operand objects are not proper type. ClassCastException is a RuntimeException, so compiler does not force you to catch this exception.