Java程序代码检查工具PMD

===================================================================== Found a 121 line (629 tokens) duplication in the following files: Starting at line 265 of /usr/local/java/src/java/nio/DirectCharBufferU.java Starting at line 265 of /usr/local/java/src/java/nio/DirectCharBufferS.java DirectCharBufferS sb = (DirectCharBufferS)src; int spos = sb.position(); int slim = sb.limit(); assert (spos <= slim); int srem = (spos <= slim ? slim - spos : 0); int pos = position(); int lim = limit(); assert (pos <= lim); int rem = (pos <= lim ? lim - pos : 0); if (srem > rem) throw new BufferOverflowException(); unsafe.copyMemory(sb.ix(spos), ix(pos), srem << 1); sb.position(spos + srem); position(pos + srem); } else if (!src.isDirect()) { int spos = src.position(); int slim = src.limit(); assert (spos <= slim); int srem = (spos <= slim ? slim - spos : 0); put(src.hb, src.offset + spos, srem); src.position(spos + srem); } else { super.put(src); } return this; } public CharBuffer put(char[] src, int offset, int length) { if ((length << 1) > Bits.JNI_COPY_FROM_ARRAY_THRESHOLD) { checkBounds(offset, length, src.length); int pos = position(); int lim = limit(); assert (pos <= lim); int rem = (pos <= lim ? lim - pos : 0); if (length > rem) throw new BufferOverflowException(); if (order() != ByteOrder.nativeOrder()) Bits.copyFromCharArray(src, offset << 1, ix(pos), length << 1); else Bits.copyFromByteArray(src, offset << 1, ix(pos), length << 1); position(pos + length); } else { super.put(src, offset, length); } return this; } public CharBuffer compact() { int pos = position(); int lim = limit(); assert (pos <= lim); int rem = (pos <= lim ? lim - pos : 0); unsafe.copyMemory(ix(pos), ix(0), rem << 1); position(rem); limit(capacity()); return this; } public boolean isDirect() { return true; } public boolean isReadOnly() { return false; }  public String toString(int start, int end) { if ((end > limit()) || (start > end)) throw new IndexOutOfBoundsException(); try { int len = end - start; char[] ca = new char[len]; CharBuffer cb = CharBuffer.wrap(ca); CharBuffer db = this.duplicate(); db.position(start); db.limit(end); cb.put(db); return new String(ca); } catch (StringIndexOutOfBoundsException x) { throw new IndexOutOfBoundsException(); } } // --- Methods to support CharSequence --- public CharSequence subSequence(int start, int end) { int len = length(); int pos = position(); assert (pos <= len); pos = (pos <= len ? pos : len); if ((start < 0) || (end > len) || (start > end)) throw new IndexOutOfBoundsException(); int sublen = end - start; int off = (pos + start) << 1; return new DirectCharBufferS(this, -1, 0, sublen, sublen, off); ===================================================================== Found a 294 line (531 tokens) duplication in the following files: Starting at line 486 of /usr/local/java/src/java/lang/StrictMath.java Starting at line 575 of /usr/local/java/src/java/lang/Math.java public static int round(float a) { return (int)floor(a + 0.5f); } /** * Returns the closest <code>long</code> to the argument. The result * is rounded to an integer by adding 1/2, taking the floor of the * result, and casting the result to type <code>long</code>. In other * words, the result is equal to the value of the expression: * <p><pre>(long)Math.floor(a + 0.5d)</pre> * <p> * Special cases: * <ul><li>If the argument is NaN, the result is 0. * <li>If the argument is negative infinity or any value less than or * equal to the value of <code>Long.MIN_VALUE</code>, the result is * equal to the value of <code>Long.MIN_VALUE</code>. * <li>If the argument is positive infinity or any value greater than or * equal to the value of <code>Long.MAX_VALUE</code>, the result is * equal to the value of <code>Long.MAX_VALUE</code>.</ul> * * @param a a floating-point value to be rounded to a * <code>long</code>. * @return the value of the argument rounded to the nearest * <code>long</code> value. * @see java.lang.Long#MAX_VALUE * @see java.lang.Long#MIN_VALUE */ public static long round(double a) { return (long)floor(a + 0.5d); } private static Random randomNumberGenerator; private static synchronized void initRNG() { if (randomNumberGenerator == null) randomNumberGenerator = new Random(); } /** * Returns a <code>double</code> value with a positive sign, greater * than or equal to <code>0.0</code> and less than <code>1.0</code>. * Returned values are chosen pseudorandomly with (approximately) * uniform distribution from that range. * <p> * When this method is first called, it creates a single new * pseudorandom-number generator, exactly as if by the expression * <blockquote><pre>new java.util.Random</pre></blockquote> * This new pseudorandom-number generator is used thereafter for all * calls to this method and is used nowhere else. * <p> * This method is properly synchronized to allow correct use by more * than one thread. However, if many threads need to generate * pseudorandom numbers at a great rate, it may reduce contention for * each thread to have its own pseudorandom-number generator. * * @return a pseudorandom <code>double</code> greater than or equal * to <code>0.0</code> and less than <code>1.0</code>. * @see java.util.Random#nextDouble() */ public static double random() { if (randomNumberGenerator == null) initRNG(); return randomNumberGenerator.nextDouble(); } /** * Returns the absolute value of an <code>int</code> value. * If the argument is not negative, the argument is returned. * If the argument is negative, the negation of the argument is returned. * <p> * Note that if the argument is equal to the value of * <code>Integer.MIN_VALUE</code>, the most negative representable * <code>int</code> value, the result is that same value, which is * negative. * * @param a the argument whose absolute value is to be determined * @return the absolute value of the argument. * @see java.lang.Integer#MIN_VALUE */ public static int abs(int a) { return (a < 0) ? -a : a; } /** * Returns the absolute value of a <code>long</code> value. * If the argument is not negative, the argument is returned. * If the argument is negative, the negation of the argument is returned. * <p> * Note that if the argument is equal to the value of * <code>Long.MIN_VALUE</code>, the most negative representable * <code>long</code> value, the result is that same value, which is * negative. * * @param a the argument whose absolute value is to be determined * @return the absolute value of the argument. * @see java.lang.Long#MIN_VALUE */ public static long abs(long a) { return (a < 0) ? -a : a; } /** * Returns the absolute value of a <code>float</code> value. * If the argument is not negative, the argument is returned. * If the argument is negative, the negation of the argument is returned. * Special cases: * <ul><li>If the argument is positive zero or negative zero, the * result is positive zero. * <li>If the argument is infinite, the result is positive infinity. * <li>If the argument is NaN, the result is NaN.</ul> * In other words, the result is the same as the value of the expression: