CS2701 Homework

Using Eclipse or some other text editor, create a file named CompilerDemo.java containing the following java statements:

public class CompilerDemo {
	public static void main(String[] args) {
		int x = methodA(100,50);
		int y = methodB(300,125);
	}

        // this method uses a for loop to compute the sum
	public static int methodA(int initialValue, int maxValue ) {
		int sum = initialValue;
		for(int i=1; i<=maxValue; i+=2 ) {
			sum += i;
		}  
		return sum;
	}

	// this method uses an equivalent while loop to compute the sum
	public static int methodB(int initialValue, int maxValue ) {
		int sum = initialValue;
		int i=1;
		while( i<=maxValue ) {
			sum += i;
			i+=2;
		}
		return sum;
	}
}

Use the console-based java compiler command to compile this file into CompilerDemo.class:

javac -g -d ./bin src/CompilerDemo.java

Note: This assumes you issue the command from a location on your filesystem that contains a "src" subfolder containing CompilerDemo.java, along with another subfolder named "bin" that will contain the CompilerDemo.class file generated by the java compiler.

Next, use the console-based javap command to disassemble the binary CompilerDemo.class file containing byte-codes into human-readable mnemonics:

javap -c -l -private -s -classpath ./bin CompilerDemo > output.txt

View the resulting output.txt file in Notepad or some other text editor. Examine the byte-code mnemonics for both methodA and methodB.

How do they differ? Explain.

Submission: Add your explanation to the output.txt file containing the disassembly, and submit the file to Blackboard.
Due date: Friday 8am. Note that no credit is given for late homework.