progression-progress.html

来自「经典的数据结构源代码（java 实现）」· HTML 代码 · 共 57 行

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57 行

<html><head><title>Code Fragment</title></head><body text=#000000><center></center><br><br><dl><dd><pre><font color=#ff0080>/** * A class for numeric progressions. */</font><font color=#8000a0>public</font> <font color=#8000a0><font color=#ff8000>class</font> </font>Progression {  <font color = #ff0080>/** First value of the progression.  */</font>  <font color=#8000a0><font color=#8000a0>protected</font> </font>long first;  <font color = #ff0080>/** Current value of the progression.  */</font>  <font color=#8000a0><font color=#8000a0>protected</font> </font>long cur;  <font color = #ff0080>/** Default constructor.  */</font>  <font color=#0000ff>Progression</font>() {    cur = first = 0;  }  <font color=#ff0080>/** Resets the progression to the first value.   *    * @return first value   */</font>  <font color=#8000a0><font color=#8000a0>protected</font> </font>long <font color=#0000ff>firstValue</font>() {    cur = first;    <font color=#8000a0><font color=#ff8000>return</font> </font>cur;  }  <font color=#ff0080>/** Advances the progression to the next value.   *   * @return next value of the progression   */</font>  <font color=#8000a0><font color=#8000a0>protected</font> </font>long <font color=#0000ff>nextValue</font>() {    <font color=#ff8000>return</font> ++cur; <font color=#ff0080>// default next value</font>  }  <font color=#ff0080>/** Prints the first n values of the progression.   *    * @param n number of values to print   */</font>  <font color=#8000a0><font color=#8000a0>public</font> </font><font color=#8000a0>void</font> <font color=#0000ff>printProgression</font>(<font color=#8000a0>int</font> n) {    System.out.<font color=#0000ff>print</font>(<font color=#0000ff>firstValue</font>());    <font color=#ff8000>for</font><font color=#0000ff> </font>(<font color=#8000a0>int</font> i = 2; i &lt;= n; i++)       System.out.<font color=#0000ff>print</font>(<font color=#008000>" "</font> + <font color=#0000ff>nextValue</font>());    System.out.<font color=#0000ff>println</font>(); <font color=#ff0080>// ends the line</font>  }}</dl></body></html>

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