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JDK 1.1 Source Code Directory
JDK 1.1 source code directory contains Java source code for JDK 1.1 core classes:
"C:\fyicenter\jdk-1.1.8\src".
Here is the list of Java classes of the JDK 1.1 source code:
✍: FYIcenter
⏎ java/lang/Integer.java
/* * @(#)Integer.java 1.44 01/12/10 * * Copyright 2002 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package java.lang; /** * The Integer class wraps a value of the primitive type <code>int</code> * in an object. An object of type <code>Integer</code> contains a * single field whose type is <code>int</code>. * <p> * In addition, this class provides several methods for converting * an <code>int</code> to a <code>String</code> and a * <code>String</code> to an <code>int</code>, as well as other * constants and methods useful when dealing with an * <code>int</code>. * * @author Lee Boynton * @author Arthur van Hoff * @version 1.44, 12/10/01 * @since JDK1.0 */ public final class Integer extends Number { /** * The smallest value of type <code>int</code>. * * @since JDK1.0 */ public static final int MIN_VALUE = 0x80000000; /** * The largest value of type <code>int</code>. * * @since JDK1.0 */ public static final int MAX_VALUE = 0x7fffffff; /** * The Class object representing the primitive type int. * * @since JDK1.1 */ public static final Class TYPE = Class.getPrimitiveClass("int"); /** * All possible chars for representing a number as a String */ final static char[] digits = { '0' , '1' , '2' , '3' , '4' , '5' , '6' , '7' , '8' , '9' , 'a' , 'b' , 'c' , 'd' , 'e' , 'f' , 'g' , 'h' , 'i' , 'j' , 'k' , 'l' , 'm' , 'n' , 'o' , 'p' , 'q' , 'r' , 's' , 't' , 'u' , 'v' , 'w' , 'x' , 'y' , 'z' }; /** * Array of chars to lookup the char for the digit in the tenth's * place for a two digit, base ten number. The char can be got by * using the number as the index. */ private final static char[] radixTenTenths = { '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '1', '1', '1', '1', '1', '1', '1', '1', '1', '1', '2', '2', '2', '2', '2', '2', '2', '2', '2', '2', '3', '3', '3', '3', '3', '3', '3', '3', '3', '3', '4', '4', '4', '4', '4', '4', '4', '4', '4', '4', '5', '5', '5', '5', '5', '5', '5', '5', '5', '5', '6', '6', '6', '6', '6', '6', '6', '6', '6', '6', '7', '7', '7', '7', '7', '7', '7', '7', '7', '7', '8', '8', '8', '8', '8', '8', '8', '8', '8', '8', '9', '9', '9', '9', '9', '9', '9', '9', '9', '9' }; /** * Array of chars to lookup the char for the digit in the unit's * place for a two digit, base ten number. The char can be got by * using the number as the index. */ private final static char[] radixTenUnits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' }; /** * Creates a string representation of the first argument in the * radix specified by the second argument. * <p> * If the radix is smaller than <code>Character.MIN_RADIX</code> or * larger than <code>Character.MAX_RADIX</code>, then the radix * <code>10</code> is used instead. * <p> * If the first argument is negative, the first element of the * result is the ASCII minus character <code>'-'</code>. If the first * argument is not negative, no sign character appears in the result. * The following ASCII characters are used as digits: * <ul><code> * 0123456789abcdefghijklmnopqrstuvwxyz * </code></ul> * * @param i an integer. * @param radix the radix. * @return a string representation of the argument in the specified radix. * @see java.lang.Character#MAX_RADIX * @see java.lang.Character#MIN_RADIX * @since JDK1.0 */ public static String toString(int i, int radix) { if (radix < Character.MIN_RADIX || radix > Character.MAX_RADIX) radix = 10; /* Use the faster version */ if (radix == 10) { return toString(i); } char buf[] = new char[33]; boolean negative = (i < 0); int charPos = 32; if (!negative) { i = -i; } while (i <= -radix) { buf[charPos--] = digits[-(i % radix)]; i = i / radix; } buf[charPos] = digits[-i]; if (negative) { buf[--charPos] = '-'; } return new String(buf, charPos, (33 - charPos)); } /** * Creates a string representation of the integer argument as an * unsigned integer in base 16. * <p> * The unsigned integer value is the argument plus 2<sup>32</sup> if * the argument is negative; otherwise, it is equal to the argument. * This value is converted to a string of ASCII digits in hexadecimal * (base 16) with no extra leading <code>0</code>s. * * @param i an integer. * @return the string representation of the unsigned integer value * represented by the argument in hexadecimal (base 16). * @since JDK1.0.2 */ public static String toHexString(int i) { return toUnsignedString(i, 4); } /** * Creates a string representation of the integer argument as an * unsigned integer in base 8. * <p> * The unsigned integer value is the argument plus 2<sup>32</sup> if * the argument is negative; otherwise, it is equal to the argument. * This value is converted to a string of ASCII digits in octal * (base 8) with no extra leading <code>0</code>s. * * @param i an integer * @return the string representation of the unsigned integer value * represented by the argument in octal (base&mnsp;8). * @since JDK1.0.2 */ public static String toOctalString(int i) { return toUnsignedString(i, 3); } /** * Creates a string representation of the integer argument as an * unsigned integer in base 2. * <p> * The unsigned integer value is the argument plus 2<sup>32</sup>if * the argument is negative; otherwise it is equal to the argument. * This value is converted to a string of ASCII digits in binary * (base 2) with no extra leading <code>0</code>s. * * @param i an integer. * @return the string representation of the unsigned integer value * represented by the argument in binary (base 2). * @since JDK1.0.2 */ public static String toBinaryString(int i) { return toUnsignedString(i, 1); } /** * Convert the integer to an unsigned number. */ private static String toUnsignedString(int i, int shift) { char[] buf = new char[32]; int charPos = 32; int radix = 1 << shift; int mask = radix - 1; do { buf[--charPos] = digits[i & mask]; i >>>= shift; } while (i != 0); return new String(buf, charPos, (32 - charPos)); } /** * Returns a new String object representing the specified integer. The radix * is assumed to be 10. * * @param i an integer to be converted. * @return a string representation of the argument in base 10. * @since JDK1.0 */ public static String toString(int i) { /** * Performance improvements - * * 1) Avoid a method call and radix checks by inlining the code for * radix = 10 in this method. * 2) Use char arrays instead of StringBuffer and avoid calls to * Character.forDigit. * 3) Do computations in positive space to avoid negation each time * around the loop. * 4) Unroll loop by half and use a static array of chars to look- * up chars for a digit. * The other option for 4) was to use a switch statement and assign * the char for the current digit. That was a little slower than 4) * with most jits. * Speed-up = (approximately) 4x on both Solaris and Win32. */ char[] buf = new char[12]; boolean negative = (i < 0); int charPos = 12; if (i == Integer.MIN_VALUE) { return "-2147483648"; } if (negative) { i = -i; } do { int digit = i%100; buf[--charPos] = radixTenUnits[digit]; buf[--charPos] = radixTenTenths[digit]; i = i / 100; } while(i != 0); if (buf[charPos] == '0') { charPos++; } if (negative) { buf[--charPos] = '-'; } return new String(buf , charPos , (12 - charPos)); } /** * Parses the string argument as a signed integer in the radix * specified by the second argument. The characters in the string * must all be digits of the specified radix (as determined by * whether <code>Character.digit</code> returns a * nonnegative value), except that the first character may be an * ASCII minus sign <code>'-'</code> to indicate a negative value. * The resulting integer value is returned. * * @param s the <code>String</code> containing the integer. * @param radix the radix to be used. * @return the integer represented by the string argument in the * specified radix. * @exception NumberFormatException if the string does not contain a * parsable integer. * @since JDK1.0 */ public static int parseInt(String s, int radix) throws NumberFormatException { if (s == null) { throw new NumberFormatException("null"); } if (radix < Character.MIN_RADIX) { throw new NumberFormatException("radix " + radix + " less than Character.MIN_RADIX"); } if (radix > Character.MAX_RADIX) { throw new NumberFormatException("radix " + radix + " greater than Character.MAX_RADIX"); } int result = 0; boolean negative = false; int i = 0, max = s.length(); int limit; int multmin; int digit; if (max > 0) { if (s.charAt(0) == '-') { negative = true; limit = Integer.MIN_VALUE; i++; } else { limit = -Integer.MAX_VALUE; } multmin = limit / radix; if (i < max) { digit = Character.digit(s.charAt(i++),radix); if (digit < 0) { throw new NumberFormatException(s); } else { result = -digit; } } while (i < max) { // Accumulating negatively avoids surprises near MAX_VALUE digit = Character.digit(s.charAt(i++),radix); if (digit < 0) { throw new NumberFormatException(s); } if (result < multmin) { throw new NumberFormatException(s); } result *= radix; if (result < limit + digit) { throw new NumberFormatException(s); } result -= digit; } } else { throw new NumberFormatException(s); } if (negative) { if (i > 1) { return result; } else { /* Only got "-" */ throw new NumberFormatException(s); } } else { return -result; } } /** * Parses the string argument as a signed decimal integer. The * characters in the string must all be decimal digits, except that * the first character may be an ASCII minus sign <code>'-'</code> to * indicate a negative value. * * @param s a string. * @return the integer represented by the argument in decimal. * @exception NumberFormatException if the string does not contain a * parsable integer. * @since JDK1.0 */ public static int parseInt(String s) throws NumberFormatException { return parseInt(s,10); } /** * Returns a new Integer object initialized to the value of the * specified String. Throws an exception if the String cannot be * parsed as an int. * * @param s the string to be parsed. * @return a newly constructed <code>Integer</code> initialized to the * value represented by the string argument in the specified * radix. * @exception NumberFormatException if the <code>String</code> does not * contain a parsable integer. * @since JDK1.0 */ public static Integer valueOf(String s, int radix) throws NumberFormatException { return new Integer(parseInt(s,radix)); } /** * Returns a new Integer object initialized to the value of the * specified String. Throws an exception if the String cannot be * parsed as an int. The radix is assumed to be 10. * * @param s the string to be parsed. * @return a newly constructed <code>Integer</code> initialized to the * value represented by the string argument. * @exception NumberFormatException if the string does not contain a * parsable integer. * @since JDK1.0 */ public static Integer valueOf(String s) throws NumberFormatException { return new Integer(parseInt(s, 10)); } /** * The value of the Integer. */ private int value; /** * Constructs a newly allocated <code>Integer</code> object that * represents the primitive <code>int</code> argument. * * @param value the value to be represented by the <code>Integer</code>. * @since JDK1.0 */ public Integer(int value) { this.value = value; } /** * Constructs a newly allocated <code>Integer</code> object that * represents the value represented by the string. The string is * converted to an int value as if by the <code>valueOf</code> method. * * @param s the <code>String</code> to be converted to an * <code>Integer</code>. * @exception NumberFormatException if the <code>String</code> does not * contain a parsable integer. * @see java.lang.Integer#valueOf(java.lang.String, int) * @since JDK1.0 */ public Integer(String s) throws NumberFormatException { this.value = parseInt(s, 10); } /** * Returns the value of this Integer as a byte. * * @since JDK1.1 */ public byte byteValue() { return (byte)value; } /** * Returns the value of this Integer as a short. * * @since JDK1.1 */ public short shortValue() { return (short)value; } /** * Returns the value of this Integer as an int. * * @return the <code>int</code> value represented by this object. * @since JDK1.0 */ public int intValue() { return value; } /** * Returns the value of this Integer as a long. * * @return the <code>int</code> value represented by this object that is * converted to type <code>long</code> and the result of the * conversion is returned. * @since JDK1.0 */ public long longValue() { return (long)value; } /** * Returns the value of this Integer as a float. * * @return the <code>int</code> value represented by this object is * converted to type <code>float</code> and the result of the * conversion is returned. * @since JDK1.0 */ public float floatValue() { return (float)value; } /** * Returns the value of this Integer as a double. * * @return the <code>int</code> value represented by this object is * converted to type <code>double</code> and the result of the * conversion is returned. * @since JDK1.0 */ public double doubleValue() { return (double)value; } /** * Returns a String object representing this Integer's value. * * @return a string representation of the value of this object in * base 10. * @since JDK1.0 */ public String toString() { return String.valueOf(value); } /** * Returns a hashcode for this Integer. * * @return a hash code value for this object. * @since JDK1.0 */ public int hashCode() { return value; } /** * Compares this object to the specified object. * The result is <code>true</code> if and only if the argument is not * <code>null</code> and is an <code>Integer</code> object that contains * the same <code>int</code> value as this object. * * @param obj the object to compare with. * @return <code>true</code> if the objects are the same; * <code>false</code> otherwise. * @since JDK1.0 */ public boolean equals(Object obj) { if ((obj != null) && (obj instanceof Integer)) { return value == ((Integer)obj).intValue(); } return false; } /** * Determines the integer value of the system property with the * specified name. * <p> * The first argument is treated as the name of a system property. * System properties are accessible through <code>getProperty</code> * and , a method defined by the <code>System</code> class. The * string value of this property is then interpreted as an integer * value and an <code>Integer</code> object representing this value is * returned. Details of possible numeric formats can be found with * the definition of <code>getProperty</code>. * <p> * If there is no property with the specified name, or if the * property does not have the correct numeric format, then * <code>null</code> is returned. * * @param nm property name. * @return the <code>Integer</code> value of the property. * @see java.lang.System#getProperty(java.lang.String) * @see java.lang.System#getProperty(java.lang.String, java.lang.String) * @since JDK1.0 */ public static Integer getInteger(String nm) { SecurityManager sm = System.getSecurityManager(); if (sm != null) sm.checkPropertyAccess(nm); return getInteger(nm, null); } /** * Determines the integer value of the system property with the * specified name. * <p> * The first argument is treated as the name of a system property. * System properties are accessible through <code>getProperty</code> * and , a method defined by the <code>System</code> class. The * string value of this property is then interpreted as an integer * value and an <code>Integer</code> object representing this value is * returned. Details of possible numeric formats can be found with * the definition of <code>getProperty</code>. * <p> * If there is no property with the specified name, or if the * property does not have the correct numeric format, then an * <code>Integer</code> object that represents the value of the * second argument is returned. * * @param nm property name. * @param val default value. * @return the <code>Integer</code> value of the property. * @see java.lang.System#getProperty(java.lang.String) * @see java.lang.System#getProperty(java.lang.String, java.lang.String) * @since JDK1.0 */ public static Integer getInteger(String nm, int val) { SecurityManager sm = System.getSecurityManager(); if (sm != null) sm.checkPropertyAccess(nm); Integer result = getInteger(nm, null); return (result == null) ? new Integer(val) : result; } /** * Determines the integer value of the system property with the * specified name. * <p> * The first argument is treated as the name of a system property. * System properties are accessible through <code>getProperty</code> * and , a method defined by the <code>System</code> class. The * string value of this property is then interpreted as an integer * value and an <code>Integer</code> object representing this value is * returned. * <p> * If the property value begins with "<code>0x</code>" or * "<code>#</code>", not followed by a minus sign, the rest * of it is parsed as a hexadecimal integer exactly as for the method * <code>Integer.valueOf</code> with radix 16. * <p> * If the property value begins with "<code>0</code>" then * it is parsed as an octal integer exactly as for the method * <code>Integer.valueOf</code> with radix 8. * <p> * Otherwise the property value is parsed as a decimal integer * exactly as for the method <code>Integer.valueOf</code> with radix 10. * <p> * The second argument is the default value. If there is no property * of the specified name, or if the property does not have the * correct numeric format, then the second argument is returned. * * @param nm property name. * @param val default value. * @return the <code>Integer</code> value of the property. * @see java.lang.System#getProperty(java.lang.String) * @see java.lang.System#getProperty(java.lang.String, java.lang.String) * @since JDK1.0 */ public static Integer getInteger(String nm, Integer val) { SecurityManager sm = System.getSecurityManager(); if (sm != null) sm.checkPropertyAccess(nm); String v = System.getProperty(nm); if (v != null) { try { return Integer.decode(v); } catch (NumberFormatException e) { } } return val; } /** * Decodes a string into an Integer. Deals with decimal, hexadecimal, * and octal numbers. * @param nm the string to decode * @since JDK1.1 */ public static Integer decode(String nm) throws NumberFormatException { if (nm.startsWith("0x")) { return Integer.valueOf(nm.substring(2), 16); } if (nm.startsWith("#")) { return Integer.valueOf(nm.substring(1), 16); } if (nm.startsWith("0") && nm.length() > 1) { return Integer.valueOf(nm.substring(1), 8); } return Integer.valueOf(nm); } /** use serialVersionUID from JDK 1.0.2 for interoperability */ private static final long serialVersionUID = 1360826667806852920L; }
⏎ java/lang/Integer.java
Or download all of them as a single archive file:
File name: jdk-1.1.8-src.zip File size: 1574187 bytes Release date: 2018-11-16 Download
⇒ Backup JDK 1.1 Installation Directory
2018-11-17, 175273👍, 0💬
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