Java

Java Java1

Java

z

z Stack

Java Java2

- Stack

LIFO Last In First Outz LIFO Last In First Out

z push:

pop:

Java Java3

StackStack

Java Java4

Vector Java

z Vector Java z Vector Java

z Vector z Vector VectorVector

z Vector

Java Java5

z : z :

(declaration) (declaration), ( ) (body) J z Java , C++ C++

Java Java6

z z , { }.

z ( ) ( )

( ( )

Java Java7

(constructors)(constructors)

z constructorsz constructorsz Constructor () ()

z constructor, Javaz constructor, Java default constructor

constructor

Java Java8

z

z ,

z : ,

Java Java9

z () ()

z

Java Java10

z

z Java public, protected, package private

Java Java11

:z : () . ( ) ( ).

Java Java12

(1)

Java Java13

(2) ( )

public: z public: z abstract: , . ;

z final: ,

Java Java14

(3) ( )

z class z class class

z extends

z implements Interfaces

i t f interfacesJava Java15

z

constructors finalize

Java Java16

constructors Stack

z (overloading) constructor :z :

public Stack() {items = new Vector(10);( );

}public Stack(int size) {

items = new Vector(size);}

Java Java17

Stack

z Stack z Stack constructor:

Stack s1= new Stack();Stack s1= new Stack();z Stack

constructor:constructor:Stack s2 = new Stack(30);

O il z O compiler constructor

Java Java18

super()p ()

z constructor z constructor

z super() () t t super() constructor super() super() constructorconstructor

Java Java19

(1) ( )

Java Java20

(2) ( )

z : public, protected, private, p , p , p ,package

z static: final: ()z final: ()

. final double AVOGADRO = 6.022e23; z transient: serialization

z volatile: compiler compiler threads (multithreading).

z :

Java Java21

(1)

Java Java22

(2) ( )

Java Java23

(3) ( )

z : public, protected, private,z : public, protected, private, package

z static: z abstract: fi l z final: -

z native: z native: ( JNI: Java Native Interface)

Java Java24

(4) ( )

z synchronized: z synchronized: / threads: z :

z : z throws exception:

Java Java25

z z

return. :public boolean isEmpty() {

if (items.size() == 0) return true;return true;

elsereturn false;

}

Java Java26

z Java (overloading)

z ( ) / /

z :class DataRenderer {class DataRenderer {

void draw(String s) { . . . } void draw(int i) { . . . } void draw(float f) { . . . }

}

Java Java27

z Java Java !

z (primitive)

z : ,

(pointer) C/C++z : primitive

Java Java28

Boxing/Unboxing

z primitive z primitive

wrap primitive (. Integer int, Double double, .) ( ( )

z Boxing: Unboxing:

Java Java29

Boxing/Unboxing g g

// ( )// ( )int i = 10;

// Integer// IntegerInteger iObj;

// b i // boxing: . .iObj = new Integer(i);

// unboxing: . .int k = iObj.intValue();

z : Java 5.0 ( 1.5) boxing/unboxing

Java Java30

z ( ) z ( ) :

this: this this: this

super(): z super() constructor

z H super

Java Java31

this

l P i t {class Point {int x; iint y;public Point(int x, int y) {

this.x = x;this.y = y;

}}

Java Java32

z :class ASillyClass { y {boolean aVariable;void aMethod() { aVariable = true;

superaVariable true; } } super

z aVariable - aMethod: class ASillierClass extends ASillyClass {boolean aVariable;void aMethod() {() {aVariable = false;super.aMethod();System.out.println(aVariable);System.out.println(aVariable);System.out.println(super.aVariable); } }}

Java Java33

() z () z

Java Java34

/

The Java Tutorial www sun comz The Java Tutorial, www.sun.com

Java Java35