Simple tool for analyzing compiled Java class files. Code is not neat, this was merely for me to look at the structure of class files in depth before working on a compiler.

gistfile1.java

package com.jonathanedgecombe.com.bytecode;

import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

public class Analyzer {
  private Map<Integer, String> strings = new HashMap<>();
  private Map<Integer, Integer> stringRefs = new HashMap<>();
	private Map<Integer, Integer> classRefs = new HashMap<>();
	private Map<Integer, int[]> methodRefs = new HashMap<>();
	
	private int idForString(String string) {
		for (Entry<Integer, Integer> ref : stringRefs.entrySet()) {
			if (strings.get(ref.getValue()) == null) continue;
			if (strings.get(ref.getValue()).equals(string)) {
				return ref.getKey();
			}
		}
		for (Entry<Integer, String> str : strings.entrySet()) {
			if (str.getValue().equals(string)) {
				return str.getKey();
			}
		}
		throw new AssertionError();
	}
	
	private String nameForMajorVersion(int version) {
		switch (version) {
		case 0x33:
			return "J2SE 7";
		case 0x32:
			return "J2SE 6.0";
		case 0x31:
			return "J2SE 5.0";
		case 0x30:
			return "JDK 1.4";
		case 0x2F:
			return "JDK 1.3";
		case 0x2E:
			return "JDK 1.2";
		case 0x2D:
			return "JDK 1.1";
		}
		return "";
	}
	
	private String className(int id) {
		Integer id2 = classRefs.get(id);
		if (id2 == null) return "";
		if (stringRefs.containsKey(id2)) {
			id2 = stringRefs.get(id2);
		}
		return strings.get(id2);
	}
	
	private String stringForId(int id) {
		if (stringRefs.containsKey(id)) {
			id = stringRefs.get(id);
		}
		return strings.get(id);
	}
	
	public static void main(String[] args) throws IOException {
		if (args.length != 1) throw new AssertionError("Unexpected arguments length. Use as: <file>");
		new Analyzer(new File(args[0]));
	}
	
	private final DataInputStream in;
	
	public Analyzer(File file) throws IOException {
		in = new DataInputStream(new FileInputStream(file));
		analyze();
	}
	
	private void analyze() throws IOException {
		int magicNumber = in.readInt();
		if (magicNumber != 0xCAFEBABE) throw new AssertionError();
		
		short minorVersion = in.readShort();
		short majorVersion = in.readShort();
		
		System.out.println("Version: Major=" + Short.toString(majorVersion) + " (" + nameForMajorVersion(majorVersion) + "); Minor=" + Short.toString(minorVersion));
		
		System.out.println();
		
		short constantPoolCount = in.readShort();
		System.out.println("Constant Pool, " + Short.toString(constantPoolCount) + " entries:");
		readConstantPool(constantPoolCount);
		
		System.out.println();
		
		short accessFlags = in.readShort();
		System.out.println("Access Flags: " + Integer.toBinaryString(accessFlags&0xFFFF));
		
		System.out.println();
		
		short thisClassId = in.readShort();
		short superClassId = in.readShort();
		System.out.println("Class CP ID: " + Short.toString(thisClassId));
		System.out.println("Superclass CP ID: " + Short.toString(superClassId));
		
		System.out.println();
		
		short interfaceCount = in.readShort();
		readInterfaces(interfaceCount);
		
		short fieldCount = in.readShort();
		readFields(fieldCount);
		
		short methodCount = in.readShort();
		readMethods(methodCount);
		
		short attributeCount = in.readShort();
		readAttributes(attributeCount);
	}
	
	private void readInterfaces(short interfaceCount) throws IOException {
		for (short index = 0; index < interfaceCount; index++) {
			readClassInfo();
			System.out.println();
		}
	}
	
	private void readClassInfo() throws IOException {
		byte tag = in.readByte();
		short nameIndex = in.readShort();
		System.out.println("INTERFACE");
		System.out.println("	TAG: " + tag);
		System.out.println("	" + className(nameIndex));
	}
	
	private void readFields(short fieldCount) throws IOException {
		for (short index = 0; index < fieldCount; index++) {
			readField();
			System.out.println();
		}
	}
	
	private void readField() throws IOException {
		short accessFlags = in.readShort();
		short nameCPIndex = in.readShort();
		short descriptorCPIndex = in.readShort();
		
		System.out.println("FIELD:");
		System.out.println("	Access Flags: " + Integer.toBinaryString(accessFlags&0xFFFF));
		
		System.out.println("	Name CP Index: " + Short.toString(nameCPIndex));
		System.out.println("	Desc CP Index: " + Short.toString(descriptorCPIndex));
		
		short attributes = in.readShort();
		for (int i = 0; i < attributes; i++) {
			readAttribute();
		}
	}
	
	private void readMethods(short methodCount) throws IOException {
		for (short index = 0; index < methodCount; index++) {
			readMethod();
			System.out.println();
		}
	}
	
	private void readMethod() throws IOException {
		short accessFlags = in.readShort();
		short nameCPIndex = in.readShort();
		short descriptorCPIndex = in.readShort();
		
		System.out.println("METHOD:");
		System.out.println("	" + stringForId(nameCPIndex));
		System.out.println("	Access Flags: " + Integer.toBinaryString(accessFlags&0xFFFF));
		
		System.out.println("	Name CP Index: " + Short.toString(nameCPIndex));
		System.out.println("	Desc CP Index: " + Short.toString(descriptorCPIndex));
		
		short attributesCount = in.readShort();
		
		for (short index = 0; index < attributesCount; index++) {
			readAttribute();
		}
	}
	
	private void readAttribute() throws IOException {
		short type = in.readShort();
		int length = in.readInt();
		
		if (type == idForString("Code")) {
			readCodeAttribute(length);
		} else {
			readUnknownAttribute(length);
		}
	}
	
	private void readUnknownAttribute(int length) throws IOException {
		byte[] data = new byte[length];
		in.readFully(data);
	}
	
	private void readCodeAttribute(int length) throws IOException {		
		short maxStack = in.readShort();
		short maxLocals = in.readShort();
		
		System.out.println("	Max Stack Size: " + Short.toString(maxStack));
		System.out.println("	Max Local Vars: " + Short.toString(maxLocals));
		
		System.out.println("	Bytecode:");
		int codeLength = in.readInt();
		int index = 0;
		while (index < codeLength) {
			System.out.print("		" + Integer.toString(index) + ": ");
			index += readInstruction();
			System.out.println();
		}
		
		short exceptionLength = in.readShort();
		for (int ex = 0; ex < exceptionLength; ex++) {
			short startPc = in.readShort();
			short endPc = in.readShort();
			short handlerPc = in.readShort();
			short catchType = in.readShort();
			
			System.out.println("	Exception: " + className(catchType) + "; SPC: " + Short.toString(startPc) + ", EPC: " + Short.toString(endPc) + ", HPC: " + Short.toString(handlerPc));
		}
		
		short attributes = in.readShort();
		for (int i = 0; i < attributes; i++) {
			readAttribute();
		}
	}
	
	private int readInstruction() throws IOException {
		byte op = in.readByte();
		
		switch (op) {
		case (byte)0x32:
			System.out.print("aaload");
			return 1;
		case (byte)0x53:
			System.out.print("aastore");
			return 1;
		case (byte)0x01:
			System.out.print("aconst_null");
			return 1;
		case (byte)0x19:
			System.out.print("aload");
			System.out.print(", index=" + in.readByte());
			return 2;
		case (byte)0x2a:
			System.out.print("aload_0");
			return 1;
		case (byte)0x2b:
			System.out.print("aload_1");
			return 1;
		case (byte)0x2c:
			System.out.print("aload_2");
			return 1;
		case (byte)0x2d:
			System.out.print("aload_3");
			return 1;
		case (byte)0xbd:
			System.out.print("anewarray");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xb0:
			System.out.print("areturn");
			return 1;
		case (byte)0xbe:
			System.out.print("arraylength");
			return 1;
		case (byte)0x3a:
			System.out.print("astore");
			System.out.print(", index=" + in.readByte());
			return 2;
		case (byte)0x4b:
			System.out.print("astore_0");
			return 1;
		case (byte)0x4c:
			System.out.print("astore_1");
			return 1;
		case (byte)0x4d:
			System.out.print("astore_2");
			return 1;
		case (byte)0x4e:
			System.out.print("astore_3");
			return 1;
		case (byte)0xbf:
			System.out.print("athrow");
			return 1;
		case (byte)0x33:
			System.out.print("baload");
			return 1;
		case (byte)0x54:
			System.out.print("bastore");
			return 1;
		case (byte)0x10:
			System.out.print("bipush");
			System.out.print(", i=" + in.readByte());
			return 2;
		case (byte)0x34:
			System.out.print("caload");
			return 1;
		case (byte)0x55:
			System.out.print("castore");
			return 1;
		case (byte)0xc0:
			System.out.print("checkcast");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0x63:
			System.out.print("dadd");
			return 1;
		case (byte)0x31:
			System.out.print("daload");
			return 1;
		case (byte)0x52:
			System.out.print("dastore");
			return 1;
		case (byte)0x98:
			System.out.print("dcmpg");
			return 1;
		case (byte)0x97:
			System.out.print("dcmpl");
			return 1;
		case (byte)0x0e:
			System.out.print("dconst_0");
			return 1;
		case (byte)0x0f:
			System.out.print("dconst_1");
			return 1;
		case (byte)0x6f:
			System.out.print("ddiv");
			return 1;
		case (byte)0x18:
			System.out.print("dload");
			System.out.print(", index=" + in.readByte());
			return 2;
		case (byte)0x26:
			System.out.print("dload_0");
			return 1;
		case (byte)0x27:
			System.out.print("dload_1");
			return 1;
		case (byte)0x28:
			System.out.print("dload_2");
			return 1;
		case (byte)0x29:
			System.out.print("dload_3");
			return 1;
		case (byte)0x6b:
			System.out.print("dmul");
			return 1;
		case (byte)0x77:
			System.out.print("dneg");
			return 1;
		case (byte)0x73:
			System.out.print("drem");
			return 1;
		case (byte)0xaf:
			System.out.print("dreturn");
			return 1;
		case (byte)0x39:
			System.out.print("dstore");
			System.out.print(", index=" + in.readByte());
			return 2;
		case (byte)0x47:
			System.out.print("dstore_0");
			return 1;
		case (byte)0x48:
			System.out.print("dstore_1");
			return 1;
		case (byte)0x49:
			System.out.print("dstore_2");
			return 1;
		case (byte)0x4a:
			System.out.print("dstore_3");
			return 1;
		case (byte)0x67:
			System.out.print("dsub");
			return 1;
		case (byte)0x59:
			System.out.print("dup");
			return 1;
		case (byte)0x5a:
			System.out.print("dup_x1");
			return 1;
		case (byte)0x5b:
			System.out.print("dup_x2");
			return 1;
		case (byte)0x5c:
			System.out.print("dup2");
			return 1;
		case (byte)0x5d:
			System.out.print("dup2_x1");
			return 1;
		case (byte)0x5e:
			System.out.print("dup2_x2");
			return 1;
		case (byte)0x62:
			System.out.print("fadd");
			return 1;
		case (byte)0x30:
			System.out.print("faload");
			return 1;
		case (byte)0x51:
			System.out.print("fastore");
			return 1;
		case (byte)0x96:
			System.out.print("fcmpg");
			return 1;
		case (byte)0x95:
			System.out.print("fcmpl");
			return 1;
		case (byte)0x0b:
			System.out.print("fconst_0");
			return 1;
		case (byte)0x0c:
			System.out.print("fconst_1");
			return 1;
		case (byte)0x0d:
			System.out.print("fconst_2");
			return 1;
		case (byte)0x6e:
			System.out.print("fdiv");
			return 1;
		case (byte)0x17:
			System.out.print("fload");
			System.out.print(", index=" + in.readByte());
			return 2;
		case (byte)0x22:
			System.out.print("fload_0");
			return 1;
		case (byte)0x23:
			System.out.print("fload_1");
			return 1;
		case (byte)0x24:
			System.out.print("fload_2");
			return 1;
		case (byte)0x25:
			System.out.print("fload_3");
			return 1;
		case (byte)0x6a:
			System.out.print("fmul");
			return 1;
		case (byte)0x76:
			System.out.print("fneg");
			return 1;
		case (byte)0x72:
			System.out.print("frem");
			return 1;
		case (byte)0xae:
			System.out.print("freturn");
			return 1;
		case (byte)0x38:
			System.out.print("fstore");
			System.out.print(", index=" + in.readByte());
			return 2;
		case (byte)0x43:
			System.out.print("fstore_0");
			return 1;
		case (byte)0x44:
			System.out.print("fstore_1");
			return 1;
		case (byte)0x45:
			System.out.print("fstore_2");
			return 1;
		case (byte)0x46:
			System.out.print("fstore_3");
			return 1;
		case (byte)0x66:
			System.out.print("fsub");
			return 1;
		case (byte)0xb4:
			System.out.print("getfield");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xb2:
			System.out.print("getstatic");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xa7:
			System.out.print("goto");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xc8:
			System.out.print("goto_w");
			System.out.print(", index=" + in.readInt());
			return 5;
		case (byte)0x85:
			System.out.print("i2l");
			return 1;
		case (byte)0x86:
			System.out.print("i2f");
			return 1;
		case (byte)0x87:
			System.out.print("i2d");
			return 1;
		case (byte)0x88:
			System.out.print("l2i");
			return 1;
		case (byte)0x89:
			System.out.print("l2f");
			return 1;
		case (byte)0x8a:
			System.out.print("l2d");
			return 1;
		case (byte)0x8b:
			System.out.print("f2i");
			return 1;
		case (byte)0x8c:
			System.out.print("f2l");
			return 1;
		case (byte)0x8d:
			System.out.print("f2d");
			return 1;
		case (byte)0x8e:
			System.out.print("d2i");
			return 1;
		case (byte)0x8f:
			System.out.print("d2l");
			return 1;
		case (byte)0x90:
			System.out.print("d2f");
			return 1;
		case (byte)0x91:
			System.out.print("i2b");
			return 1;
		case (byte)0x92:
			System.out.print("i2c");
			return 1;
		case (byte)0x93:
			System.out.print("i2s");
			return 1;
		case (byte)0x60:
			System.out.print("iadd");
			return 1;
		case (byte)0x2e:
			System.out.print("iaload");
			return 1;
		case (byte)0x7e:
			System.out.print("iand");
			return 1;
		case (byte)0x4f:
			System.out.print("iastore");
			return 1;
		case (byte)0x02:
			System.out.print("iconst_m1");
			return 1;
		case (byte)0x03:
			System.out.print("iconst_0");
			return 1;
		case (byte)0x04:
			System.out.print("iconst_1");
			return 1;
		case (byte)0x05:
			System.out.print("iconst_2");
			return 1;
		case (byte)0x06:
			System.out.print("iconst_3");
			return 1;
		case (byte)0x07:
			System.out.print("iconst_4");
			return 1;
		case (byte)0x08:
			System.out.print("iconst_5");
			return 1;
		case (byte)0x6c:
			System.out.print("idiv");
			return 1;
		case (byte)0xa5:
			System.out.print("if_acmpeq");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xa6:
			System.out.print("if_acmpne");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0x9f:
			System.out.print("if_icmpeq");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xa0:
			System.out.print("if_icmpne");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xa1:
			System.out.print("if_icmplt");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xa2:
			System.out.print("if_icmpge");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xa3:
			System.out.print("if_icmpgt");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xa4:
			System.out.print("if_icmple");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0x99:
			System.out.print("ifeq");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0x9a:
			System.out.print("ifne");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0x9b:
			System.out.print("iflt");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0x9c:
			System.out.print("ifge");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0x9d:
			System.out.print("ifgt");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0x9e:
			System.out.print("ifle");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xc7:
			System.out.print("ifnonnull");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xc6:
			System.out.print("ifnull");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0x84:
			System.out.print("iinc");
			System.out.print(", index=" + in.readByte() + " const=" + in.readByte());
			return 3;
		case (byte)0x15:
			System.out.print("iload");
			System.out.print(", index=" + in.readByte());
			return 2;
		case (byte)0x1a:
			System.out.print("iload_0");
			return 1;
		case (byte)0x1b:
			System.out.print("iload_1");
			return 1;
		case (byte)0x1c:
			System.out.print("iload_2");
			return 1;
		case (byte)0x1d:
			System.out.print("iload_3");
			return 1;
		case (byte)0x68:
			System.out.print("imul");
			return 1;
		case (byte)0x74:
			System.out.print("ineg");
			return 1;
		case (byte)0xc1:
			System.out.print("instanceof");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xba:
			System.out.print("invokedynamic");
			System.out.print(", index=" + in.readShort() + " extra=" + in.readShort());
			return 5;
		case (byte)0xb9:
			System.out.print("invokeinterface");
			System.out.print(", index=" + in.readShort() + " count=" + in.readByte() + " extra=" + in.readByte());
			return 5;
		case (byte)0xb7:
			System.out.print("invokespecial");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xb8:
			System.out.print("invokestatic");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xb6:
			System.out.print("invokevirtual");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0x80:
			System.out.print("ior");
			return 1;
		case (byte)0x70:
			System.out.print("irem");
			return 1;
		case (byte)0xac:
			System.out.print("ireturn");
			return 1;
		case (byte)0x78:
			System.out.print("ishl");
			return 1;
		case (byte)0x7a:
			System.out.print("ishr");
			return 1;
		case (byte)0x36:
			System.out.print("istore");
			System.out.print(", index=" + in.readByte());
			return 2;
		case (byte)0x3b:
			System.out.print("istore_0");
			return 1;
		case (byte)0x3c:
			System.out.print("istore_1");
			return 1;
		case (byte)0x3d:
			System.out.print("istore_2");
			return 1;
		case (byte)0x3e:
			System.out.print("istore_3");
			return 1;
		case (byte)0x64:
			System.out.print("isub");
			return 1;
		case (byte)0x7c:
			System.out.print("iushr");
			return 1;
		case (byte)0x82:
			System.out.print("ixor");
			return 1;
		case (byte)0xa8:
			System.out.print("jsr");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xc9:
			System.out.print("jsr_w");
			System.out.print(", index=" + in.readInt());
			return 5;
		case (byte)0x61:
			System.out.print("ladd");
			return 1;
		case (byte)0x2f:
			System.out.print("laload");
			return 1;
		case (byte)0x7f:
			System.out.print("land");
			return 1;
		case (byte)0x50:
			System.out.print("lastore");
			return 1;
		case (byte)0x94:
			System.out.print("lcmp");
			return 1;
		case (byte)0x09:
			System.out.print("lconst_0");
			return 1;
		case (byte)0x0a:
			System.out.print("lconst_1");
			return 1;
		case (byte)0x12:
			System.out.print("ldc");
			System.out.print(", index=" + in.readByte());
			return 2;
		case (byte)0x13:
			System.out.print("ldc_w");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0x14:
			System.out.print("ldc2_w");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0x6d:
			System.out.print("ldiv");
			return 1;
		case (byte)0x16:
			System.out.print("lload");
			System.out.print(", index=" + in.readByte());
			return 2;
		case (byte)0x1e:
			System.out.print("lload_0");
			return 1;
		case (byte)0x1f:
			System.out.print("lload_1");
			return 1;
		case (byte)0x20:
			System.out.print("lload_2");
			return 1;
		case (byte)0x21:
			System.out.print("lload_3");
			return 1;
		case (byte)0x69:
			System.out.print("lmul");
			return 1;
		case (byte)0x75:
			System.out.print("lneg");
			return 1;
		case (byte)0xab:
			System.out.print("lookupswitch");
			throw new AssertionError();
		case (byte)0x81:
			System.out.print("lor");
			return 1;
		case (byte)0x71:
			System.out.print("lrem");
			return 1;
		case (byte)0xad:
			System.out.print("lreturn");
			return 1;
		case (byte)0x79:
			System.out.print("lshl");
			return 1;
		case (byte)0x7b:
			System.out.print("lshr");
			return 1;
		case (byte)0x37:
			System.out.print("lstore");
			System.out.print(", index=" + in.readByte());
			return 2;
		case (byte)0x3f:
			System.out.print("lstore_0");
			return 1;
		case (byte)0x40:
			System.out.print("lstore_1");
			return 1;
		case (byte)0x41:
			System.out.print("lstore_2");
			return 1;
		case (byte)0x42:
			System.out.print("lstore_3");
			return 1;
		case (byte)0x65:
			System.out.print("lsub");
			return 1;
		case (byte)0x7d:
			System.out.print("lushr");
			return 1;
		case (byte)0x83:
			System.out.print("lxor");
			return 1;
		case (byte)0xc2:
			System.out.print("monitorenter");
			return 1;
		case (byte)0xc3:
			System.out.print("monitorexit");
			return 1;
		case (byte)0xc5:
			System.out.print("multianewarray");
			System.out.print(", index=" + in.readShort() + " dimensions=" + in.readByte());
			return 4;
		case (byte)0xbb:
			System.out.print("new");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xbc:
			System.out.print("newarray");
			System.out.print(", type=" + in.readByte());
			return 2;
		case (byte)0x00:
			System.out.print("nop");
			return 1;
		case (byte)0x57:
			System.out.print("pop");
			return 1;
		case (byte)0x58:
			System.out.print("pop2");
			return 1;
		case (byte)0xb5:
			System.out.print("putfield");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xb3:
			System.out.print("putstatic");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0xa9:
			System.out.print("ret");
			System.out.print(", index=" + in.readByte());
			return 2;
		case (byte)0xb1:
			System.out.print("return");
			return 1;
		case (byte)0x35:
			System.out.print("saload");
			return 1;
		case (byte)0x56:
			System.out.print("sastore");
			return 1;
		case (byte)0x11:
			System.out.print("sipush");
			System.out.print(", index=" + in.readShort());
			return 3;
		case (byte)0x5f:
			System.out.print("swap");
			return 1;
		case (byte)0xaa:
			System.out.print("tableswitch");
			throw new AssertionError();
		case (byte)0xc4:
			System.out.print("wide");
			throw new AssertionError();
		default:
			System.out.print("UNKNOWN OP: " + Byte.toString(op));
		}
		
		return 1;
	}
	
	private void readAttributes(short attributeCount) throws IOException {
		for (short index = 0; index < attributeCount; index++) {
			readAttribute();
			System.out.println();
		}
	}
	
	private void readConstantPool(short constantPoolCount) throws IOException {
		for (short index = 1; index < constantPoolCount; index++) {
			System.out.print("	" + Integer.toString(index) + ", ");
			if (readConstantPoolEntry(index))  {
				index++;
				in.readByte();
			}
			System.out.println("#" + constantPoolCount);
		}
	}
	
	private boolean readConstantPoolEntry(int index) throws IOException {
		byte type = in.readByte();
		
		switch (type) {
		case 1:
			short length = in.readShort();
			byte[] buffer = new byte[length];
			in.readFully(buffer);
			String data = new String(buffer);
			
			strings.put(index, data);
			
			System.out.println("STRING: \"" + data + "\"");
			break;
			
		case 3:
			int intConstant = in.readInt();
			System.out.println("INT: \"" + Integer.toString(intConstant) + "\"");
			break;
			
		case 4:
			float floatConstant = in.readInt();
			System.out.println("FLOAT: \"" + Float.toString(floatConstant) + "\"");
			break;
			
		case 5:
			long longConstant = in.readInt();
			System.out.println("LONG: \"" + Long.toString(longConstant) + "\"");
			return true;
			
		case 6:
			double doubleConstant = in.readInt();
			System.out.println("DOUBLE: \"" + Double.toString(doubleConstant) + "\"");
			return true;
			
		case 7:
			short index1 = in.readShort();
			classRefs.put(index, (int) index1);
			System.out.println("CLASS REF: " + Short.toString(index1));
			break;
			
		case 8:
			index1 = in.readShort();
			stringRefs.put(index, (int) index1);
			System.out.println("STRING REF: " + Short.toString(index1));
			break;
			
		case 9:
			index1 = in.readShort();
			short index2 = in.readShort();
			System.out.println("FIELD REF: Class=" + Short.toString(index1) + ", NameType=" + Short.toString(index2));
			break;
			
		case 10:
			index1 = in.readShort();
			index2 = in.readShort();
			methodRefs.put(index, new int[] {index1, index2});
			System.out.println("METHOD REF: Class=" + Short.toString(index1) + ", NameType=" + Short.toString(index2));
			break;
			
		case 11:
			index1 = in.readShort();
			index2 = in.readShort();
			System.out.println("INTERFACE REF: Class=" + Short.toString(index1) + ", NameType=" + Short.toString(index2));
			break;
			
		case 12:
			index1 = in.readShort();
			index2 = in.readShort();
			System.out.println("NAMETYPE DESC: Name=" + Short.toString(index1) + ", Type=" + Short.toString(index2));
			break;
			
		case 15:
			in.readByte();
			in.readShort();
			
		case 16:
			in.readShort();
			break;
			
		case 18:
			in.readShort();
			in.readShort();
			break;
		
		case 0:
			in.readShort();
		}
		
		return false;
	}
}