The document discusses the stack, heap, and metaspace in Java memory. It explains that local variables and references live on the stack, while non-primitive objects are stored in the heap and referenced by variables on the stack. All static fields of a class live in the metaspace. The document also contains code examples and explanations of post-increment, pre-increment, and operator precedence in expressions.

1. Oct 13th
Lab09.
Stack, Heap, and Metaspace
http://www.slideshare.net/takyeon

2. public class Student {
public String name;
public int tokenLevel;
private static int currentCount = 0;
private static final int DEFAULT_TOKENS = 3;
public Student() {
name = "unknown";
tokenLevel = DEFAULT_TOKENS;
currentCount++;
}
}
Student s1 = new Student();
s1.name = "Tak";
currentCount 1 X
DEFAULT_TOKENS
constructor
"unknown"
STACK HEAP META SPACE
0
3
s1
name
tokenLevel 3
"Tak"
All static fields of a class live in
Metaspace.
All local variables (both
primitives and references)
live on the stack. Non-primitive
data objects are
stored in the heap, and
referenced by variables on
the stack.
All non-primitive objects live on the heap.
Primitive instance variables of those objects
are stored inside the object. Non-primitive
variables are stored outside of the object,
and referenced by the instance variable.

3. Size? 5
*
***
*****
*******
*********
Scanner sc = new Scanner(System.in);
int size = sc.nextInt();
for(int row=0; row<size; row++) {
for(int col=0;col<4-row;col++) {
System.out.print(" ");
}
for(int col=0;col<row*2+1;col++) {
System.out.print("*");
}
System.out.println();
}
sc.close();
row col : 1st
spaces before *
col : 2nd
number of *
0 4 1
1 3 3
2 2 5
3 1 7
4 0 9

4. int x,y;
x=2; y=5;
System.out.println(x++ * y++);
System.out.println(++x * ++y);
System.out.println(++x * y++);
System.out.println(x++ * ++y);
System.out.println("1 + 2 = " + 1 + 2);
System.out.println("1 + 2 = " + (1 + 2));
1 + 2 = 12
1 + 2 = 3
year % 4 == 0 && year % 100 != 0 || year % 400 == 0
((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)

5. Any question?