Oct 13th Lab09.Stack, Heap, and Metaspace

http://www.slideshare.net/takyeon

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";

STACK HEAP META SPACE

DEFAULT_TOKENS

0

3

currentCount 1 Xs1

nametokenLevel 3

"unknown"

"Tak"

X

constructor

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.

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 11 3 32 2 53 1 74 0 9

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 = 121 + 2 = 3

year % 4 == 0 && year % 100 != 0 || year % 400 == 0

((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)

Any question?