August 20, 2007

Aha! Java

Jon Bentley talks about the Aha! Insight in his book Programming Pearls.

I got 2 such 'Aha!s' today :

1) Java does support Short Circuit Operators(or short circuit evaluation)
public class myTest2 {

public static void main(String[] args) {
myTest2 sct = new myTest2();
if (sct.isTrue("left") || sct.isTrue("right")) {
//you may swap the 'left' and the 'right' and observe the behaviour
System.out.println("Expression is true.");
} else {
System.out.println("Expression is false.");
}
System.out.println("All done.");
}

public boolean isTrue(String msg) {
System.out.println("in isTrue (arg = '" + msg + "')");
if (msg.equals("right")) return true;
else return false;
}
}


2) Loop unrolling leads to instruction level parallelism. But am not sure whether this will have any effect on the way Java is architectured. I presume that stack based architectures(Java/JVM) do not have any effect on ILP.

Any thoughts or Ahas!!!!!
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