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POJava: conditional initialization?
 

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  1. POJava: conditional initialization?
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    <p>Ruby has conditional initialization. Apparently, Java does not or does it? I try to write more succintly, to limit the range as small as possible.</p> <pre><code>import java.io.*; import java.util.*; public class InitFor{ public static void main(String[] args){ for(int i=7,k=999;i+((String h="hello").size())&lt;10;i++){} System.out.println("It should be: hello = "+h); } } </code></pre> <p><strong>Errors</strong></p> <pre><code>Press ENTER or type command to continue InitFor.java:8: ')' expected for(int i=7,k=999;i+((String h="hello").size())&lt;10;i++){} ^ </code></pre> <p><strong>Puzzles</strong></p> <ol> <li>Is it possible to assign a value to an declared value in while-loop? <strong>YES</strong> code1</li> <li>Assignment in for-loop conditional? <strong>YES</strong> code2</li> <li>conditional init <strong>NO</strong> </li> <li>Can you assign different types of values in loops? <strong>YES in a reply</strong></li> <li>Some rule for initialization inside loops? Declare outside to access values later, what about init? <strong>(?)</strong></li> </ol> <p><strong>1. CODE</strong></p> <pre><code>import java.io.*; import java.util.*; public class InitFor{ public static void main(String[] args){ int k=5; while((k=(k%3)+1)!=1){ System.out.println(k); } //PRINTs only 3 } } </code></pre> <p><strong>2. CODE</strong></p> <pre><code>import java.io.*; import java.util.*; public class InitFor{ public static void main(String[] args){ int k=5; for(;(k=(k%3)+1)!=1;){ System.out.println(k); } //PRINTs only 3 System.out.println(k); // WHY DOES IT PRINT 1? Assign in for-loop! } } </code></pre> <p><strong>Part of the Original problem with many different kind of assignments and initializations -- 100lines of code in one-liner</strong></p> <pre><code>for(int t=0,size=(File[] fs=((File f=f.getParentFile()).listFiles(filt))).size();fs==null;t++){if(t&gt;maxDepth){throw new Exception("No dir to read");}} </code></pre>
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    1. COWhat are you trying to accomplish?
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      1. USMichael Aaron Safyan
    2. CO@MAS It should print "It should be: hello = hello", by assuming the error did not exist.
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      1. USMing-Tang
 

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