boolean͵ΪԱʱϵͳĬֵʼΪtrue double͵ռ洢32λ
133йJAVAҪʹõһȷ( D ) JAVAҪʹһȶ
ڳκεطֻҪڱʹǰͿ ֮ʹ
ֲʹ֮ǰԲʼϵͳʹĬϵijʼֵ 134JAVAУһ( D ) int $e,a,b =10; char c,d ='a'; float e=0.0d; double e=0.0f;
135ڱдJAVAʱΪijԱʼֵJAVAĬֵ˵ǣ C byte0 int0
long 0.0l float0.0f
136һJAVAԵ( A ) ָ
137ȷһ(? A ) ʶַĺԸ ʶִСд
ͱַ͡͡ ڻ
138һڱɲ֣ D ֵ С
139ĸ public void example(){...} ط D private void example( int m){...} public int example(){...} public void example2(){...}
public int example(int m, float f){...}
140ĸJavaȷʾ D 11 0x22 033 44H
141ĸmain()ĺϷ D
char args[] char args[][] String arg[] String args
142֪ʽint m[]={0, 1, 2, 3, 4, 5, 67 };? ĸʽֵ±ȣ B m.length() m.length-1 m.length()+1 m.length+1
143䶨5Ԫص飨? A int []a={22,23,24,25,12}; int a[]=new int(5); int [5] array; int [] arr;
144֪µִjava MyTest a b c ĸȷģ? C args[0] = \args[0] = \args[0] = \args[1]= 'c'
145ĸ䲻ܶһַ? B? char c1='a'; char c2=\char c4=97;
char c3='\A';
146JavaУWorkerPerson࣬WorkerĹ췽һ\䣨C?
Workerжsuper() Personжsuper() PersonĹ췽
147ָĸ뷽public void add(int a){? }Ϊط( A ) public int add(int a) public void add(long a) public int add(long a) public void add(float a)
148ʽ1+2/3-4*5ֵΪ( B ) 1 -19 -5 0 149һΪMyClass࣬ҸɱʣôȷӦΪ( C ) private class MyClass extends Object class MyClass extends Object
public class MyClass
protected class MyClass extends Object
150ִ³a=0;c=0; do{ --c; a=a-1; }while(a>0); Cֵǣ C 0 1 -1 ѭ 151
ִ³a=0;c=0; do{ c--; a=a-1; }while(a>0); Cֵǣ C 0 1 -1 ѭ
һ£
1CPUָCRT????? F
2һװõıд洢ͳƹ?? T*
3ڼУִIJǶϢмӹ?????????????????????????????????????????? 4ʱֵĴһdzϵĴ* 5һʱûвϵͳ
6ֵһòʽ洢
7JavaԿԿͻJavaСӦóԼķӦóȡ
8Java2ΪJ2EEJ2SEJ2MEJ2SEJavaҵ棬ҵӦ÷Ŀ
9JavaʺϿƽ̨Ӧó 10JavaʺϵͳܶIJϵͳJavaдġ
11JavaԴļչΪ.javaļ루һ¡ 12Javaƽ̨ҪJREʵֵġ
13JavaӦóApplicationͬJava AppletУҪõͻ֧֡
14װJDKʱҪûpathclasspathJAVA_HOME
£
1J2EEҵҵΪӦóĽ 2J2MEСͰѲƷǶʽ豸ѽ 3J2SEΪ濪͵ͶӦṩ˿еĽ
4JavaִСдԣؼֵĴСдܸclassдClassCLASSǴġ
5JavaԴд֮ļʽӲ̻UϣԴļֿȡģһһ¡
6JDKпУñjavac.exeɵļǶƿִļ
7JavaԷΪJava ApplicationJava Applet࣬зʽͬġ
8ϵͳMicrosoft Wndows XP/Wndows7LinuxUNIXMac OSȶ֧JavaIJϵͳ
9JavacJavaJavaԴJavaֽijֽļԴļͬչǣclass 10appletviewer JavaСִHTMLļе JavaС. Applet ǸģʾAppletн
11ѭforǰѾж岢ѭֵʼΪգֺŲʡԡ
12do?whileѭִйִѭһΣڸжǷִѭ
13JavaԵκַͣ͡͡ͲͶʹȽǷȣжǷȡ
14Javaṩרŵѭ䣺for䡢whiledo?while䡣
15switchѡṹУbreak˳switchģbreakִз֮⣬һִ䡣
16switchеıʽֵͻַͻDz͡
17switchУcaseӾifӾƣһ䣬ҲǶ䡣
18switchУcaseӾǶ䣬ûţ
19switchУdefaultDZģǵʽֵκһcaseеֵƥʱִdefault
20JavaУÿASCIIӢռ8bitռֽڣ16bit
21JavaУ䡰boolean? t=1; booleanͱtֵΪtrue
22JavaУִ䡰boolean t=1&&8;ĽʹñtֵΪtrue
23֪䡰short t=640;ȷģ䡰short t=640000;Ҳȷ
24䡰b=2a+2;ȷı
25Javaûбָ÷Javaֻнͷռõڴ
26JavaͨջƼ˳ڴ 27JavaԵͰ顢ͽӿڡ
28Ϊ캯ֿԲͬ