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JRE 8 rt.jar - java.* Package Source Code
JRE 8 rt.jar is the JAR file for JRE 8 RT (Runtime) libraries. JRE (Java Runtime) 8 is the runtime environment included in JDK 8. JRE 8 rt.jar libraries are divided into 6 packages:
com.* - Internal Oracle and Sun Microsystems libraries java.* - Standard Java API libraries. javax.* - Extended Java API libraries. jdk.* - JDK supporting libraries. org.* - Third party libraries. sun.* - Old libraries developed by Sun Microsystems.
JAR File Information:
Directory of C:\fyicenter\jdk-1.8.0_191\jre\lib 63,596,151 rt.jar
Here is the list of Java classes of the java.* package in JRE 1.8.0_191 rt.jar. Java source codes are also provided.
✍: FYIcenter
⏎ java/math/RoundingMode.java
/* * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. * * * * * * * * * * * * * * * * * * * * */ /* * Portions Copyright IBM Corporation, 2001. All Rights Reserved. */ package java.math; /** * Specifies a <i>rounding behavior</i> for numerical operations * capable of discarding precision. Each rounding mode indicates how * the least significant returned digit of a rounded result is to be * calculated. If fewer digits are returned than the digits needed to * represent the exact numerical result, the discarded digits will be * referred to as the <i>discarded fraction</i> regardless the digits' * contribution to the value of the number. In other words, * considered as a numerical value, the discarded fraction could have * an absolute value greater than one. * * <p>Each rounding mode description includes a table listing how * different two-digit decimal values would round to a one digit * decimal value under the rounding mode in question. The result * column in the tables could be gotten by creating a * {@code BigDecimal} number with the specified value, forming a * {@link MathContext} object with the proper settings * ({@code precision} set to {@code 1}, and the * {@code roundingMode} set to the rounding mode in question), and * calling {@link BigDecimal#round round} on this number with the * proper {@code MathContext}. A summary table showing the results * of these rounding operations for all rounding modes appears below. * *<table border> * <caption><b>Summary of Rounding Operations Under Different Rounding Modes</b></caption> * <tr><th></th><th colspan=8>Result of rounding input to one digit with the given * rounding mode</th> * <tr valign=top> * <th>Input Number</th> <th>{@code UP}</th> * <th>{@code DOWN}</th> * <th>{@code CEILING}</th> * <th>{@code FLOOR}</th> * <th>{@code HALF_UP}</th> * <th>{@code HALF_DOWN}</th> * <th>{@code HALF_EVEN}</th> * <th>{@code UNNECESSARY}</th> * * <tr align=right><td>5.5</td> <td>6</td> <td>5</td> <td>6</td> <td>5</td> <td>6</td> <td>5</td> <td>6</td> <td>throw {@code ArithmeticException}</td> * <tr align=right><td>2.5</td> <td>3</td> <td>2</td> <td>3</td> <td>2</td> <td>3</td> <td>2</td> <td>2</td> <td>throw {@code ArithmeticException}</td> * <tr align=right><td>1.6</td> <td>2</td> <td>1</td> <td>2</td> <td>1</td> <td>2</td> <td>2</td> <td>2</td> <td>throw {@code ArithmeticException}</td> * <tr align=right><td>1.1</td> <td>2</td> <td>1</td> <td>2</td> <td>1</td> <td>1</td> <td>1</td> <td>1</td> <td>throw {@code ArithmeticException}</td> * <tr align=right><td>1.0</td> <td>1</td> <td>1</td> <td>1</td> <td>1</td> <td>1</td> <td>1</td> <td>1</td> <td>1</td> * <tr align=right><td>-1.0</td> <td>-1</td> <td>-1</td> <td>-1</td> <td>-1</td> <td>-1</td> <td>-1</td> <td>-1</td> <td>-1</td> * <tr align=right><td>-1.1</td> <td>-2</td> <td>-1</td> <td>-1</td> <td>-2</td> <td>-1</td> <td>-1</td> <td>-1</td> <td>throw {@code ArithmeticException}</td> * <tr align=right><td>-1.6</td> <td>-2</td> <td>-1</td> <td>-1</td> <td>-2</td> <td>-2</td> <td>-2</td> <td>-2</td> <td>throw {@code ArithmeticException}</td> * <tr align=right><td>-2.5</td> <td>-3</td> <td>-2</td> <td>-2</td> <td>-3</td> <td>-3</td> <td>-2</td> <td>-2</td> <td>throw {@code ArithmeticException}</td> * <tr align=right><td>-5.5</td> <td>-6</td> <td>-5</td> <td>-5</td> <td>-6</td> <td>-6</td> <td>-5</td> <td>-6</td> <td>throw {@code ArithmeticException}</td> *</table> * * * <p>This {@code enum} is intended to replace the integer-based * enumeration of rounding mode constants in {@link BigDecimal} * ({@link BigDecimal#ROUND_UP}, {@link BigDecimal#ROUND_DOWN}, * etc. ). * * @see BigDecimal * @see MathContext * @author Josh Bloch * @author Mike Cowlishaw * @author Joseph D. Darcy * @since 1.5 */ public enum RoundingMode { /** * Rounding mode to round away from zero. Always increments the * digit prior to a non-zero discarded fraction. Note that this * rounding mode never decreases the magnitude of the calculated * value. * *<p>Example: *<table border> * <caption><b>Rounding mode UP Examples</b></caption> *<tr valign=top><th>Input Number</th> * <th>Input rounded to one digit<br> with {@code UP} rounding *<tr align=right><td>5.5</td> <td>6</td> *<tr align=right><td>2.5</td> <td>3</td> *<tr align=right><td>1.6</td> <td>2</td> *<tr align=right><td>1.1</td> <td>2</td> *<tr align=right><td>1.0</td> <td>1</td> *<tr align=right><td>-1.0</td> <td>-1</td> *<tr align=right><td>-1.1</td> <td>-2</td> *<tr align=right><td>-1.6</td> <td>-2</td> *<tr align=right><td>-2.5</td> <td>-3</td> *<tr align=right><td>-5.5</td> <td>-6</td> *</table> */ UP(BigDecimal.ROUND_UP), /** * Rounding mode to round towards zero. Never increments the digit * prior to a discarded fraction (i.e., truncates). Note that this * rounding mode never increases the magnitude of the calculated value. * *<p>Example: *<table border> * <caption><b>Rounding mode DOWN Examples</b></caption> *<tr valign=top><th>Input Number</th> * <th>Input rounded to one digit<br> with {@code DOWN} rounding *<tr align=right><td>5.5</td> <td>5</td> *<tr align=right><td>2.5</td> <td>2</td> *<tr align=right><td>1.6</td> <td>1</td> *<tr align=right><td>1.1</td> <td>1</td> *<tr align=right><td>1.0</td> <td>1</td> *<tr align=right><td>-1.0</td> <td>-1</td> *<tr align=right><td>-1.1</td> <td>-1</td> *<tr align=right><td>-1.6</td> <td>-1</td> *<tr align=right><td>-2.5</td> <td>-2</td> *<tr align=right><td>-5.5</td> <td>-5</td> *</table> */ DOWN(BigDecimal.ROUND_DOWN), /** * Rounding mode to round towards positive infinity. If the * result is positive, behaves as for {@code RoundingMode.UP}; * if negative, behaves as for {@code RoundingMode.DOWN}. Note * that this rounding mode never decreases the calculated value. * *<p>Example: *<table border> * <caption><b>Rounding mode CEILING Examples</b></caption> *<tr valign=top><th>Input Number</th> * <th>Input rounded to one digit<br> with {@code CEILING} rounding *<tr align=right><td>5.5</td> <td>6</td> *<tr align=right><td>2.5</td> <td>3</td> *<tr align=right><td>1.6</td> <td>2</td> *<tr align=right><td>1.1</td> <td>2</td> *<tr align=right><td>1.0</td> <td>1</td> *<tr align=right><td>-1.0</td> <td>-1</td> *<tr align=right><td>-1.1</td> <td>-1</td> *<tr align=right><td>-1.6</td> <td>-1</td> *<tr align=right><td>-2.5</td> <td>-2</td> *<tr align=right><td>-5.5</td> <td>-5</td> *</table> */ CEILING(BigDecimal.ROUND_CEILING), /** * Rounding mode to round towards negative infinity. If the * result is positive, behave as for {@code RoundingMode.DOWN}; * if negative, behave as for {@code RoundingMode.UP}. Note that * this rounding mode never increases the calculated value. * *<p>Example: *<table border> * <caption><b>Rounding mode FLOOR Examples</b></caption> *<tr valign=top><th>Input Number</th> * <th>Input rounded to one digit<br> with {@code FLOOR} rounding *<tr align=right><td>5.5</td> <td>5</td> *<tr align=right><td>2.5</td> <td>2</td> *<tr align=right><td>1.6</td> <td>1</td> *<tr align=right><td>1.1</td> <td>1</td> *<tr align=right><td>1.0</td> <td>1</td> *<tr align=right><td>-1.0</td> <td>-1</td> *<tr align=right><td>-1.1</td> <td>-2</td> *<tr align=right><td>-1.6</td> <td>-2</td> *<tr align=right><td>-2.5</td> <td>-3</td> *<tr align=right><td>-5.5</td> <td>-6</td> *</table> */ FLOOR(BigDecimal.ROUND_FLOOR), /** * Rounding mode to round towards {@literal "nearest neighbor"} * unless both neighbors are equidistant, in which case round up. * Behaves as for {@code RoundingMode.UP} if the discarded * fraction is ≥ 0.5; otherwise, behaves as for * {@code RoundingMode.DOWN}. Note that this is the rounding * mode commonly taught at school. * *<p>Example: *<table border> * <caption><b>Rounding mode HALF_UP Examples</b></caption> *<tr valign=top><th>Input Number</th> * <th>Input rounded to one digit<br> with {@code HALF_UP} rounding *<tr align=right><td>5.5</td> <td>6</td> *<tr align=right><td>2.5</td> <td>3</td> *<tr align=right><td>1.6</td> <td>2</td> *<tr align=right><td>1.1</td> <td>1</td> *<tr align=right><td>1.0</td> <td>1</td> *<tr align=right><td>-1.0</td> <td>-1</td> *<tr align=right><td>-1.1</td> <td>-1</td> *<tr align=right><td>-1.6</td> <td>-2</td> *<tr align=right><td>-2.5</td> <td>-3</td> *<tr align=right><td>-5.5</td> <td>-6</td> *</table> */ HALF_UP(BigDecimal.ROUND_HALF_UP), /** * Rounding mode to round towards {@literal "nearest neighbor"} * unless both neighbors are equidistant, in which case round * down. Behaves as for {@code RoundingMode.UP} if the discarded * fraction is > 0.5; otherwise, behaves as for * {@code RoundingMode.DOWN}. * *<p>Example: *<table border> * <caption><b>Rounding mode HALF_DOWN Examples</b></caption> *<tr valign=top><th>Input Number</th> * <th>Input rounded to one digit<br> with {@code HALF_DOWN} rounding *<tr align=right><td>5.5</td> <td>5</td> *<tr align=right><td>2.5</td> <td>2</td> *<tr align=right><td>1.6</td> <td>2</td> *<tr align=right><td>1.1</td> <td>1</td> *<tr align=right><td>1.0</td> <td>1</td> *<tr align=right><td>-1.0</td> <td>-1</td> *<tr align=right><td>-1.1</td> <td>-1</td> *<tr align=right><td>-1.6</td> <td>-2</td> *<tr align=right><td>-2.5</td> <td>-2</td> *<tr align=right><td>-5.5</td> <td>-5</td> *</table> */ HALF_DOWN(BigDecimal.ROUND_HALF_DOWN), /** * Rounding mode to round towards the {@literal "nearest neighbor"} * unless both neighbors are equidistant, in which case, round * towards the even neighbor. Behaves as for * {@code RoundingMode.HALF_UP} if the digit to the left of the * discarded fraction is odd; behaves as for * {@code RoundingMode.HALF_DOWN} if it's even. Note that this * is the rounding mode that statistically minimizes cumulative * error when applied repeatedly over a sequence of calculations. * It is sometimes known as {@literal "Banker's rounding,"} and is * chiefly used in the USA. This rounding mode is analogous to * the rounding policy used for {@code float} and {@code double} * arithmetic in Java. * *<p>Example: *<table border> * <caption><b>Rounding mode HALF_EVEN Examples</b></caption> *<tr valign=top><th>Input Number</th> * <th>Input rounded to one digit<br> with {@code HALF_EVEN} rounding *<tr align=right><td>5.5</td> <td>6</td> *<tr align=right><td>2.5</td> <td>2</td> *<tr align=right><td>1.6</td> <td>2</td> *<tr align=right><td>1.1</td> <td>1</td> *<tr align=right><td>1.0</td> <td>1</td> *<tr align=right><td>-1.0</td> <td>-1</td> *<tr align=right><td>-1.1</td> <td>-1</td> *<tr align=right><td>-1.6</td> <td>-2</td> *<tr align=right><td>-2.5</td> <td>-2</td> *<tr align=right><td>-5.5</td> <td>-6</td> *</table> */ HALF_EVEN(BigDecimal.ROUND_HALF_EVEN), /** * Rounding mode to assert that the requested operation has an exact * result, hence no rounding is necessary. If this rounding mode is * specified on an operation that yields an inexact result, an * {@code ArithmeticException} is thrown. *<p>Example: *<table border> * <caption><b>Rounding mode UNNECESSARY Examples</b></caption> *<tr valign=top><th>Input Number</th> * <th>Input rounded to one digit<br> with {@code UNNECESSARY} rounding *<tr align=right><td>5.5</td> <td>throw {@code ArithmeticException}</td> *<tr align=right><td>2.5</td> <td>throw {@code ArithmeticException}</td> *<tr align=right><td>1.6</td> <td>throw {@code ArithmeticException}</td> *<tr align=right><td>1.1</td> <td>throw {@code ArithmeticException}</td> *<tr align=right><td>1.0</td> <td>1</td> *<tr align=right><td>-1.0</td> <td>-1</td> *<tr align=right><td>-1.1</td> <td>throw {@code ArithmeticException}</td> *<tr align=right><td>-1.6</td> <td>throw {@code ArithmeticException}</td> *<tr align=right><td>-2.5</td> <td>throw {@code ArithmeticException}</td> *<tr align=right><td>-5.5</td> <td>throw {@code ArithmeticException}</td> *</table> */ UNNECESSARY(BigDecimal.ROUND_UNNECESSARY); // Corresponding BigDecimal rounding constant final int oldMode; /** * Constructor * * @param oldMode The {@code BigDecimal} constant corresponding to * this mode */ private RoundingMode(int oldMode) { this.oldMode = oldMode; } /** * Returns the {@code RoundingMode} object corresponding to a * legacy integer rounding mode constant in {@link BigDecimal}. * * @param rm legacy integer rounding mode to convert * @return {@code RoundingMode} corresponding to the given integer. * @throws IllegalArgumentException integer is out of range */ public static RoundingMode valueOf(int rm) { switch(rm) { case BigDecimal.ROUND_UP: return UP; case BigDecimal.ROUND_DOWN: return DOWN; case BigDecimal.ROUND_CEILING: return CEILING; case BigDecimal.ROUND_FLOOR: return FLOOR; case BigDecimal.ROUND_HALF_UP: return HALF_UP; case BigDecimal.ROUND_HALF_DOWN: return HALF_DOWN; case BigDecimal.ROUND_HALF_EVEN: return HALF_EVEN; case BigDecimal.ROUND_UNNECESSARY: return UNNECESSARY; default: throw new IllegalArgumentException("argument out of range"); } } }
⏎ java/math/RoundingMode.java
Or download all of them as a single archive file:
File name: jre-rt-java-1.8.0_191-src.zip File size: 6664831 bytes Release date: 2018-10-28 Download
⇒ JRE 8 rt.jar - javax.* Package Source Code
2023-08-23, 247657👍, 4💬
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