Examples of com.ibm.icu.math.MathContext

com.ibm.icu.math.MathContext
The MathContext immutable class encapsulates the settings understood by the operator methods of the {@link BigDecimal}class (and potentially other classes). Operator methods are those that effect an operation on a number or a pair of numbers.
The settings, which are not base-dependent, comprise:
1. digits: the number of digits (precision) to be used for an operation
2. form: the form of any exponent that results from the operation
3. lostDigits: whether checking for lost digits is enabled
4. roundingMode: the algorithm to be used for rounding.
When provided, a MathContext object supplies the settings for an operation directly.
When MathContext.DEFAULT is provided for a MathContext parameter then the default settings are used (9, SCIENTIFIC, false, ROUND_HALF_UP).
In the BigDecimal class, all methods which accept a MathContext object defaults) also have a version of the method which does not accept a MathContext parameter. These versions carry out unlimited precision fixed point arithmetic (as though the settings were (0, PLAIN, false, ROUND_HALF_UP).
The instance variables are shared with default access (so they are directly accessible to the BigDecimal class), but must never be changed.
The rounding mode constants have the same names and values as the constants of the same name in java.math.BigDecimal, to maintain compatibility with earlier versions of BigDecimal. @see BigDecimal @author Mike Cowlishaw @stable ICU 2.0

//#endif


    public void testJB4971()
    {
        DecimalFormat decfmt = new DecimalFormat();
        MathContext resultICU;


        MathContext comp1 = new MathContext(0, MathContext.PLAIN);
        resultICU = decfmt.getMathContextICU();
        if ((comp1.getDigits() != resultICU.getDigits()) ||
            (comp1.getForm() != resultICU.getForm()) ||
            (comp1.getLostDigits() != resultICU.getLostDigits()) ||
            (comp1.getRoundingMode() != resultICU.getRoundingMode()))
        {
            errln("ERROR: Math context 1 not equal - result: " + resultICU.toString() +
                " / expected: " + comp1.toString());
        }


        MathContext comp2 = new MathContext(5, MathContext.ENGINEERING);
        decfmt.setMathContextICU(comp2);
        resultICU = decfmt.getMathContextICU();
        if ((comp2.getDigits() != resultICU.getDigits()) ||
            (comp2.getForm() != resultICU.getForm()) ||
            (comp2.getLostDigits() != resultICU.getLostDigits()) ||
            (comp2.getRoundingMode() != resultICU.getRoundingMode()))
        {
            errln("ERROR: Math context 2 not equal - result: " + resultICU.toString() +
                " / expected: " + comp2.toString());
        }


//#if defined(FOUNDATION10) || defined(J2SE13) || defined(J2SE14)
//#else

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     * @draft ICU 4.2
     * @provisional This API might change or be removed in a future release.
     */
    public void setMathContext(java.math.MathContext newValue)
    {
        mathContext = new MathContext(newValue.getPrecision(),
                                      MathContext.SCIENTIFIC,
                                      false,
                                      (newValue.getRoundingMode()).ordinal()
                                      );
    }

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            MathContext.ROUND_UNNECESSARY, MathContext.ROUND_UP};


        public Object[] getTestObjects()
        {
            int objectCount = forms.length * rounds.length;
            MathContext contexts[] = new MathContext[objectCount];
            int i = 0;
            
            for (int f = 0; f < forms.length; f += 1) {
                for (int r = 0; r < rounds.length; r += 1) {
                    int digits = f * r;
                    boolean lostDigits = (r & 1) != 0;
                    
                    contexts[i++] = new MathContext(digits, forms[f], lostDigits, rounds[r]);
                }
            }
            
            return contexts;
        }

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            return contexts;
        }
        
        public boolean hasSameBehavior(Object a, Object b)
        {
            MathContext mca = (MathContext) a;
            MathContext mcb = (MathContext) b;
            
            return mca.toString().equals(mcb.toString());
        }

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     * @param newValue desired MathContext
     * @see #getMathContext
     * @stable ICU 4.2
     */
    public void setMathContext(java.math.MathContext newValue) {
        mathContext = new MathContext(newValue.getPrecision(), MathContext.SCIENTIFIC, false,
                                      (newValue.getRoundingMode()).ordinal());
    }

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   *            desired MathContext
   * @see #getMathContext
   * @stable ICU 4.2
   */
  public void setMathContext(final java.math.MathContext newValue) {
    mathContext = new MathContext(newValue.getPrecision(), MathContext.SCIENTIFIC, false, (newValue.getRoundingMode()).ordinal());
  }

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Related Classes of com.ibm.icu.math.MathContext

com.ibm.icu.dev.test.format.IntlTestDecimalFormatAPI

com.ibm.icu.dev.test.serializable.SerializableTest$MathContextHandler

com.ibm.icu.text.DecimalFormat

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