=== Q01 Why is Java platform independent? ===
magic = CAFEBABE
class file major version = 69
=== Q02 JDK vs JRE vs JVM ===
running on Java 25
JVM: OpenJDK 64-Bit Server VM
compiler available: true
=== Q03 Primitive types and their sizes ===
byte   1 byte,  -128 to 127
short  2 bytes, -32768 to 32767
int    4 bytes, -2147483648 to 2147483647
long   8 bytes, -9223372036854775808 to 9223372036854775807
float  4 bytes, double 8 bytes, char 2 bytes
field defaults: 0, false, null
=== Q04 Type casting and overflow ===
7 / 2 = 3, (double) 7 / 2 = 3.5
(byte) 130 = -126
Integer.MAX_VALUE + 1 = -2147483648
c + 1 = 66, (char) (c + 1) = B
0.1 + 0.2 = 0.30000000000000004
Math.addExact: integer overflow
=== Q05 Autoboxing and the Integer cache ===
127 == 127 -> true
128 == 128 -> false
128 equals 128 -> true
Long 127 equals Integer 127 -> false
=== Q06 Is Java pass by value or pass by reference? ===
after reassign: original
after mutate:   original + mutated
=== Q07 static variables, static blocks and initialisation order ===
static block runs once, when the class loads
instance block runs before each constructor body
constructor #1
instance block runs before each constructor body
constructor #2
=== Q08 final, finally and finalize ===
final array contents changed: 99
in try
finally always runs
Object.finalize forRemoval = true, since 9
=== Q09 Stack vs heap ===
heap array length = 1000000
StackOverflowError after many frames: true