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用JAVA编写的,在做实验的时候留下来的,本来想删的,但是传上来,大家分享吧

<a name="137" href="#137">137</a> 
<a name="138" href="#138">138</a>     <em>/**<em>* Removes the top &lt;code>n&lt;/code> stack-trace elements from</em></em>
<a name="139" href="#139">139</a> <em>     *  &lt;code>t&lt;/code>.  This is useful inside methods like {@link</em>
<a name="140" href="#140">140</a> <em>     *  #fail} to help debuggers more quickly identify the location of</em>
<a name="141" href="#141">141</a> <em>     *  a failure. */</em>
<a name="142" href="#142">142</a>     <strong>public</strong> <strong>static</strong> <strong>void</strong> popTrace(Throwable t, <strong>int</strong> n) {
<a name="143" href="#143">143</a>         <em class="comment">/*<em class="comment">StackTraceElement[] ot = t.getStackTrace();</em></em>
<a name="144" href="#144">144</a> <em class="comment">        int len = ot.length - n;</em>
<a name="145" href="#145">145</a> <em class="comment">        StackTraceElement[] nt = new StackTraceElement[len];</em>
<a name="146" href="#146">146</a> <em class="comment">        System.arraycopy(ot, n, nt, 0, len);</em>
<a name="147" href="#147">147</a> <em class="comment">        t.setStackTrace(nt);*/</em>
<a name="148" href="#148">148</a>     }
<a name="149" href="#149">149</a> 
<a name="150" href="#150">150</a>     <strong>public</strong> <strong>static</strong> <strong>int</strong> decodeInt(byte[] buf, <strong>int</strong> offset) {
<a name="151" href="#151">151</a>         <strong>return</strong> ((buf[offset+3]&amp;0xff)&lt;&lt;24
<a name="152" href="#152">152</a>                 | (buf[offset+2]&amp;0xff)&lt;&lt;16
<a name="153" href="#153">153</a>                 | (buf[offset+1]&amp;0xff)&lt;&lt;8
<a name="154" href="#154">154</a>                 | (buf[offset]&amp;0xff));
<a name="155" href="#155">155</a>     }
<a name="156" href="#156">156</a> 
<a name="157" href="#157">157</a>     <strong>public</strong> <strong>static</strong> <strong>int</strong> decodeShort(byte[] buf, <strong>int</strong> offset) {
<a name="158" href="#158">158</a>         <strong>return</strong> ((buf[offset+1]&amp;0xff)&lt;&lt;8
<a name="159" href="#159">159</a>                 | (buf[offset]&amp;0xff));
<a name="160" href="#160">160</a>     }
<a name="161" href="#161">161</a> 
<a name="162" href="#162">162</a>     <strong>public</strong> <strong>static</strong> <strong>void</strong> encodeShort(byte[] buf, <strong>int</strong> offset, <strong>int</strong> val) {
<a name="163" href="#163">163</a>         X.check(val&lt;=Short.MAX_VALUE &amp;&amp; val>=Short.MIN_VALUE);
<a name="164" href="#164">164</a>         buf[offset++] = (byte)val; val >>= 8;
<a name="165" href="#165">165</a>         buf[offset] = (byte)val;
<a name="166" href="#166">166</a>     }
<a name="167" href="#167">167</a> 
<a name="168" href="#168">168</a>     <strong>public</strong> <strong>static</strong> <strong>void</strong> encodeInt(byte[] buf, <strong>int</strong> offset, <strong>int</strong> val) {
<a name="169" href="#169">169</a>         buf[offset++] = (byte)val; val >>= 8;
<a name="170" href="#170">170</a>         buf[offset++] = (byte)val; val >>= 8;
<a name="171" href="#171">171</a>         buf[offset++] = (byte)val; val >>= 8;
<a name="172" href="#172">172</a>         buf[offset] = (byte)val;
<a name="173" href="#173">173</a>     }
<a name="174" href="#174">174</a> 
<a name="175" href="#175">175</a>     <strong>public</strong> <strong>static</strong> <strong>long</strong> decodeLong(byte[] buf, <strong>int</strong> offset) {
<a name="176" href="#176">176</a>         <strong>long</strong> lo = decodeInt(buf, offset) &amp; 0xffffffffL;
<a name="177" href="#177">177</a>         <strong>long</strong> hi = decodeInt(buf, offset+4);
<a name="178" href="#178">178</a>         <strong>return</strong> (hi&lt;&lt;32) | lo;
<a name="179" href="#179">179</a>     }
<a name="180" href="#180">180</a> 
<a name="181" href="#181">181</a>     <strong>public</strong> <strong>static</strong> <strong>void</strong> encodeLong(byte[] buf, <strong>int</strong> offset, <strong>long</strong> val) {
<a name="182" href="#182">182</a>         buf[offset++] = (byte)val; val >>= 8;
<a name="183" href="#183">183</a>         buf[offset++] = (byte)val; val >>= 8;
<a name="184" href="#184">184</a>         buf[offset++] = (byte)val; val >>= 8;
<a name="185" href="#185">185</a>         buf[offset++] = (byte)val; val >>= 8;
<a name="186" href="#186">186</a>         buf[offset++] = (byte)val; val >>= 8;
<a name="187" href="#187">187</a>         buf[offset++] = (byte)val; val >>= 8;
<a name="188" href="#188">188</a>         buf[offset++] = (byte)val; val >>= 8;
<a name="189" href="#189">189</a>         buf[offset] = (byte)val;
<a name="190" href="#190">190</a>     }
<a name="191" href="#191">191</a> 
<a name="192" href="#192">192</a> 
<a name="193" href="#193">193</a>     <em>/**<em>*</em></em>
<a name="194" href="#194">194</a> <em>     *  returns the printable representation of &lt;code>data&lt;/code></em>
<a name="195" href="#195">195</a> <em>     *  after escaping non-printable characters in C style.</em>
<a name="196" href="#196">196</a> <em>     */</em>
<a name="197" href="#197">197</a>     <strong>public</strong> <strong>static</strong> String printable(byte[] data) {
<a name="198" href="#198">198</a>         <strong>return</strong> printable(data, 0, data.length);
<a name="199" href="#199">199</a>     }
<a name="200" href="#200">200</a> 
<a name="201" href="#201">201</a>     <em>/**<em>*</em></em>
<a name="202" href="#202">202</a> <em>     *  returns the printable representation of &lt;code>data&lt;/code></em>
<a name="203" href="#203">203</a> <em>     *  from &lt;code>start&lt;/code> (inclusive) to &lt;code>end&lt;/code> (exclusive).</em>
<a name="204" href="#204">204</a> <em>     *  after escaping non-printable characters in C style.</em>
<a name="205" href="#205">205</a> <em>     *  &lt;code>data&lt;/code> may not be &lt;code>null&lt;/code> and</em>
<a name="206" href="#206">206</a> <em>     *  &lt;code>start&lt;/code> must be smaller or equal to &lt;code>end&lt;/code></em>
<a name="207" href="#207">207</a> <em>     *  Both &lt;code>start&lt;/code> and &lt;code>end&lt;/code> are bounded by</em>
<a name="208" href="#208">208</a> <em>     *  &lt;code>0&lt;/code> and &lt;code>data.length&lt;/code> bot inclusive.</em>
<a name="209" href="#209">209</a> <em>     */</em>
<a name="210" href="#210">210</a> 
<a name="211" href="#211">211</a>     <strong>public</strong> <strong>static</strong> String pr<strong>int</strong>able(byte[] data, <strong>int</strong> start, <strong>int</strong> end) {
<a name="212" href="#212">212</a>         checkargs(data != <strong>null</strong>);
<a name="213" href="#213">213</a>         checkargs(start &lt;= end);
<a name="214" href="#214">214</a>         checkargs(start >= 0);
<a name="215" href="#215">215</a>         checkargs(end &lt;= data.length);
<a name="216" href="#216">216</a>         StringBuffer sb = <strong>new</strong> StringBuffer();
<a name="217" href="#217">217</a> 
<a name="218" href="#218">218</a>         <strong>for</strong> (<strong>int</strong> i = start; i &lt; end; i++) {
<a name="219" href="#219">219</a>             <strong>final</strong> byte b = data[i];
<a name="220" href="#220">220</a>             <strong>if</strong> (b &lt; 0x20 || b > 0x7e) {
<a name="221" href="#221">221</a>                 <strong>switch</strong> (b) {
<a name="222" href="#222">222</a>                 <strong>case</strong> '\r':
<a name="223" href="#223">223</a>                     sb.append(<span class="string">"&#47;&#47;r"</span>);
<a name="224" href="#224">224</a>                     <strong>break</strong>;
<a name="225" href="#225">225</a>                 <strong>case</strong> '\n':
<a name="226" href="#226">226</a>                     sb.append(<span class="string">"&#47;&#47;n"</span>);
<a name="227" href="#227">227</a>                     <strong>break</strong>;
<a name="228" href="#228">228</a>                 <strong>case</strong> '\t':
<a name="229" href="#229">229</a>                     sb.append(<span class="string">"&#47;&#47;t"</span>);
<a name="230" href="#230">230</a>                     <strong>break</strong>;
<a name="231" href="#231">231</a>                 <strong>case</strong> '\b':
<a name="232" href="#232">232</a>                     sb.append(<span class="string">"&#47;&#47;b"</span>);
<a name="233" href="#233">233</a>                     <strong>break</strong>;
<a name="234" href="#234">234</a>                 <strong>case</strong> '\f':
<a name="235" href="#235">235</a>                     sb.append(<span class="string">"&#47;&#47;f"</span>);
<a name="236" href="#236">236</a>                     <strong>break</strong>;
<a name="237" href="#237">237</a>                 <strong>case</strong> '&#47;&#47;':
<a name="238" href="#238">238</a>                     sb.append(<span class="string">"&#47;&#47;&#47;&#47;"</span>);
<a name="239" href="#239">239</a>                     <strong>break</strong>;
<a name="240" href="#240">240</a>                 <strong>default</strong>:
<a name="241" href="#241">241</a>                     sb.append('&#47;&#47;');
<a name="242" href="#242">242</a>                     sb.append(b >>> 6);
<a name="243" href="#243">243</a>                     sb.append((b >>> 3) &amp; 0x07);
<a name="244" href="#244">244</a>                     sb.append(b &amp; 0x07);
<a name="245" href="#245">245</a>                     <strong>break</strong>;
<a name="246" href="#246">246</a>                 }
<a name="247" href="#247">247</a>             } <strong>else</strong> {
<a name="248" href="#248">248</a>                 sb.append((<strong>char</strong>)b);
<a name="249" href="#249">249</a>             }
<a name="250" href="#250">250</a>         }
<a name="251" href="#251">251</a>         <strong>return</strong> sb.toString();
<a name="252" href="#252">252</a>     }
<a name="253" href="#253">253</a> 
<a name="254" href="#254">254</a>     <strong>public</strong> <strong>static</strong> <strong>void</strong> log(String ctxt, Level level, String msg, Throwable t) {
<a name="255" href="#255">255</a>         Logger.getLogger(<span class="string">"st."</span>+ctxt).log(level,  ctxt+<span class="string">": "</span>+msg, t);
<a name="256" href="#256">256</a>     }
<a name="257" href="#257">257</a>     <strong>public</strong> <strong>static</strong> <strong>void</strong> log(String ctxt, Level level, String msg) {
<a name="258" href="#258">258</a>         Logger.getLogger(<span class="string">"st."</span>+ctxt).log(level, ctxt+<span class="string">": "</span>+msg);
<a name="259" href="#259">259</a>     }
<a name="260" href="#260">260</a>     <strong>public</strong> <strong>static</strong> ArrayList dupElim(ArrayList al, Comparator cm) {
<a name="261" href="#261">261</a>         <strong>if</strong> (al.size()&lt;2)
<a name="262" href="#262">262</a>             <strong>return</strong> al;
<a name="263" href="#263">263</a>         Collections.sort(al, cm);
<a name="264" href="#264">264</a>         Object prev =  al.get(0);
<a name="265" href="#265">265</a>         ArrayList n = <strong>new</strong> ArrayList();
<a name="266" href="#266">266</a>         n.add(prev);
<a name="267" href="#267">267</a>         <strong>for</strong> (<strong>int</strong> i = 1; i &lt; al.size(); i++) {
<a name="268" href="#268">268</a>             <strong>if</strong> (!prev.equals(al.get(i)))
<a name="269" href="#269">269</a>                 n.add(al.get(i));
<a name="270" href="#270">270</a>             prev =  al.get(i);
<a name="271" href="#271">271</a>         }
<a name="272" href="#272">272</a>         <strong>return</strong> n;
<a name="273" href="#273">273</a>     }
<a name="274" href="#274">274</a> 
<a name="275" href="#275">275</a> }
</pre>
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