src/java.base/share/classes/java/io/PushbackReader.java

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  85         synchronized (lock) {
  86             ensureOpen();
  87             if (pos < buf.length)
  88                 return buf[pos++];
  89             else
  90                 return super.read();
  91         }
  92     }
  93 
  94     /**
  95      * Reads characters into a portion of an array.
  96      *
  97      * @param      cbuf  Destination buffer
  98      * @param      off   Offset at which to start writing characters
  99      * @param      len   Maximum number of characters to read
 100      *
 101      * @return     The number of characters read, or -1 if the end of the
 102      *             stream has been reached
 103      *
 104      * @exception  IOException  If an I/O error occurs

 105      */
 106     public int read(char cbuf[], int off, int len) throws IOException {
 107         synchronized (lock) {
 108             ensureOpen();
 109             try {
 110                 if (len <= 0) {
 111                     if (len < 0) {
 112                         throw new IndexOutOfBoundsException();
 113                     } else if ((off < 0) || (off > cbuf.length)) {
 114                         throw new IndexOutOfBoundsException();
 115                     }
 116                     return 0;
 117                 }
 118                 int avail = buf.length - pos;
 119                 if (avail > 0) {
 120                     if (len < avail)
 121                         avail = len;
 122                     System.arraycopy(buf, pos, cbuf, off, avail);
 123                     pos += avail;
 124                     off += avail;




  85         synchronized (lock) {
  86             ensureOpen();
  87             if (pos < buf.length)
  88                 return buf[pos++];
  89             else
  90                 return super.read();
  91         }
  92     }
  93 
  94     /**
  95      * Reads characters into a portion of an array.
  96      *
  97      * @param      cbuf  Destination buffer
  98      * @param      off   Offset at which to start writing characters
  99      * @param      len   Maximum number of characters to read
 100      *
 101      * @return     The number of characters read, or -1 if the end of the
 102      *             stream has been reached
 103      *
 104      * @exception  IOException  If an I/O error occurs
 105      * @exception  IndexOutOfBoundsException {@inheritDoc}
 106      */
 107     public int read(char cbuf[], int off, int len) throws IOException {
 108         synchronized (lock) {
 109             ensureOpen();
 110             try {
 111                 if (len <= 0) {
 112                     if (len < 0) {
 113                         throw new IndexOutOfBoundsException();
 114                     } else if ((off < 0) || (off > cbuf.length)) {
 115                         throw new IndexOutOfBoundsException();
 116                     }
 117                     return 0;
 118                 }
 119                 int avail = buf.length - pos;
 120                 if (avail > 0) {
 121                     if (len < avail)
 122                         avail = len;
 123                     System.arraycopy(buf, pos, cbuf, off, avail);
 124                     pos += avail;
 125                     off += avail;