ClassReader

ClassReader.java

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

public class ClassReader {

	public static void main(String[] args) {
		if(args.length < 1){
			System.out.println("Input a path of the class file for the first argument.");
			return;
		}
		
		String f = args[0];

		InputStream input = null;
		try {
			input = new BufferedInputStream(new FileInputStream(new File(f)));
			
			System.out.print(paddingRight("Binary", 8));
			System.out.println("|Hex");
			System.out.println("------------");
			int c;
			while ((c = input.read()) != -1) {
				System.out.print(String.format("%08d", Integer.parseInt(Integer.toBinaryString(c))));
				System.out.print(" ");
				System.out.print(Integer.toHexString(c).toUpperCase());
				System.out.println("");
			}
			
		} catch (Exception e) {
			e.printStackTrace();
		}finally{
			try {
				input.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
	
	public static String paddingRight(String s, int n) {
	     return String.format("%1$-" + n + "s", s);  
	}
}