integer.java

专业汽车级嵌入式操作系统OSEK的源代码

package java.lang;

/**
 * Minimal Integer implementation that supports converting an int to a String.
 *
 */

  public final class Integer {
    /**
     * The smallest value of type <code>int</code>. The constant 
     * value of this field is <tt>-2147483648</tt>.
     */
    public static final int   MIN_VALUE = 0x80000000;

    /**
     * The largest value of type <code>int</code>. The constant 
     * value of this field is <tt>2147483647</tt>.
     */
    public static final int   MAX_VALUE = 0x7fffffff;

    /**
     * The value of the Integer.
     *
     * @serial
     */
    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>.
     */
    public Integer(int value) {
	this.value = value;
    }

    static char buf [] = new char [12] ; 

    /**
     * Returns a new String object representing the specified integer. The 
     * argument is converted to signed decimal representation and returned 
     * as a string, exactly as if the argument and radix <tt>10</tt> were 
     * given as arguments to the toString(int, int) method.
     *
     * @param   i   an integer to be converted.
     * @return  a string representation of the argument in base&nbsp;10.
     */
    public static synchronized String toString(int i) {
       int q, r, charPos = 12; 
       char sign = 0 ; 

       if (i == Integer.MIN_VALUE) return "-2147483648";

       if (i < 0) { 
          sign = '-' ; 
          i = -i ; 
       }

       for (;;) { 
          q = i/10; ; 
          r = i-(q*10) ;
          buf [--charPos] = (char) ((int) '0' + r) ; 
          i = q ; 
          if (i == 0) break ; 
       }

       if (sign != 0) {
         buf [--charPos] = sign ; 
       }

       return new String ( buf, charPos, 12 - charPos) ; 
   }

   /**
    * Returns a String object representing this Integer's value. The 
    * value is converted to signed decimal representation and returned 
    * as a string.
    *
    * @return  a string representation of the value of this object in
    *          base&nbsp;10.
    */
    public String toString() {
	return toString(value);
    }
}