Example of a small java source to big class file

big-class.sh

# The raw file size
$ ls -l
total 4
-rw-rw-r-- 1 joakim joakim 564 Nov 11 16:01 A.java

# The java source contents
$ cat A.java 
class A {{
  int a;
  try {a=0;} finally {
  try {a=0;} finally {
  try {a=0;} finally {
  try {a=0;} finally {
  try {a=0;} finally {
  try {a=0;} finally {
  try {a=0;} finally {
  try {a=0;} finally {
  try {a=0;} finally {
  try {a=0;} finally {
  try {a=0;} finally {
  try {a=0;} finally {
  a=0;
  }}}}}}}}}}}}
}
A() { }
A(int a) { }
A(char a) { }
A(double a) { }
A(float a) { }
A(long a) { }
A(short a) { }
A(boolean a) { }
A(String a) { }
A(Integer a) { }
A(Float a) { }
A(Short a) { }
A(Long a) { }
A(Double a) { }
A(Boolean a) { }
A(Character a) { }

}

# Compile it
$ javac A.java

# How big is the resulting class file?
$ ls -l
total 102780
-rw-rw-r-- 1 joakim joakim 105236500 Nov 11 16:21 A.class
-rw-rw-r-- 1 joakim joakim       564 Nov 11 16:01 A.java

# What? thats a 101M class file!
$ ls -lh
total 101M
-rw-rw-r-- 1 joakim joakim 101M Nov 11 16:21 A.class
-rw-rw-r-- 1 joakim joakim  564 Nov 11 16:01 A.java