【正文】 ow f) {..} static private void splashExit(JDBeesIntro intro, JWindow f){…} } 海外師資、北美技術(shù)、外企經(jīng)驗 達內(nèi)外企 IT培訓 30 01062136369 。 02161202630； 02085518868 Other Java Commands ?Generate java security policy file $policytool ?Generate security keys $keytool ?Generate rmi stub codes $rmic options class names ?Start rmi registry $rmiregistry ? Determine whether a class is serializable $ serialver [classpath classpath] [show] [classname...] 海外師資、北美技術(shù)、外企經(jīng)驗 達內(nèi)外企 IT培訓 34 01062136369 。 02161202630； 02085518868 Review Questions 1.(Level 1) Which environment variables need to be set? 2.(Level 1) What are the advantages of Java Language? Why Java have then? 3.(Level 1) Which JDK tools can be used to pile and run a java program? 4.(Level 1)What are the basic packages in Java. 5.(Level 1) If all three toplevel elements occur in a source file, they must appear in which order: A. Imports, package declarations, classes B. Classes, imports, package declarations C. package declarations。 02161202630； 02085518868 Goals ?Comments ?Identifiers ?Keywords ?Primitive data types ?Literal values for different types ?Definitions of class、 object、member variable and reference variable ?Class declaration ?Class variables ?Create an instance ?Default value ?Describe a reference variable 海外師資、北美技術(shù)、外企經(jīng)驗 達內(nèi)外企 IT培訓 42 01062136369 。 private String gender。 = age。 /** * * author Administrator */ public class VariableNameTest { /**valid variable declaration */ int $99。 02161202630； 02085518868 Keywords in Java abstract do implements private throw boolean double import protected throws break else instanceof public transient byte extends int return true case false interface short try catch final long static void char finally native super volatile class float new switch while continue for null synchronized default if package this goto const (not used in java but reserved as keywords) Strictly, ―true‖ and ―false‖ are not keywords, they are literal values of boolean type 海外師資、北美技術(shù)、外企經(jīng)驗 達內(nèi)外企 IT培訓 46 01062136369 。 02161202630； 02085518868 Text Data Type—char and String ?char unsigned 16bit integer literal value must be included within ? and ? char zhChar = ?中’； char enChar = ?a‘。 02161202630； 02085518868 Integer DataTypesbyte, short, int and long ?Three ways to represent: Octal(8), Decimal(10), and Hexadecimal(16) ?Default type is int ?long data end with ?l‘ or ?L‘ public void testIntType() { int ia = 0x55。 long la = 1234567L。 float fc = (float)。 } 海外師資、北美技術(shù)、外企經(jīng)驗 達內(nèi)外企 IT培訓 51 01062136369 。 // declare int variables float z = 。 // declare character variable String str。 // assign value to char variable str = Hi out there!。 02161202630； 02085518868 Remended Naming Rules ?Class names begin with uppercase character class Account {…} ?Interface names begin with uppercase character interface AccountBase {…} ?Method names begin with lowercase character String getStudentName() {…} ?Variable names begin with lowercase character String studentName。 02161202630； 02085518868 Create a Type class package sample。 /** Creates a new instance of Teacher */ public Teacher(String name, int age, double salary) { = salary。 } /**get the salary of this teacher */ public double getSalary() { return salary。 (Teacher: + ())。 02161202630； 02085518868 Difference between Primitive Types and Reference Type ?Primitive type variables evaluation int x = 10。 gzhu = new Teacher(―Gee Zhu‖, 30, 10000)。 02161202630； 02085518868 Summary In this chapter, we have discussed: Different types of ments Identifier and Keyword Primitive data types Definition of class、 object、 member variable and reference variable Class declaration Create an instance 海外師資、北美技術(shù)、外企經(jīng)驗 達內(nèi)外企 IT培訓 60 01062136369 。 02161202630； 02085518868 Assignment 1. (Level 1) Learn how to use Jbuilder to write and run simple java programs.. 2. (Level 2 )Use JDK/Vi and Jbuilder respectively, pile and run in you handout.. 3. (Level 2) Add a new method to increase the teacher‘s salary with 5000,then print out the new salary. In addition, add ments to your codes. CONFIDENTIAL Module 3: Expressions and Flow Control 中國北京： 電 話 ： 01062196102, 62136369 地 址：海淀區(qū)北三環(huán)西路 18號 中鼎大廈 B座 70 709室 郵編： 100086 Email: 中國上海： 電話： 02161202630， 61202603 地 址： 上海市北京東路 668號 (上?？萍季┏?)C區(qū) 9樓 郵編： 202201 Email: 加拿大多倫多： Tel : 1(647) 2848872 Address: 1067 Crescent Place Toronto, Ontario, Canada Post Code: M4C 5L7 海外師資、北美技術(shù)、外企經(jīng)驗 達內(nèi)外企 IT培訓 65 01062136369 。 //Just declare int y = 10。 //Declare and initiate String str1 = new String(World)。 //Evaluate } public void incorrectLocalV() { int x, z。t be initiated String str。 02161202630； 02085518868 Variable and Scope— Instance Variable ? Defined in a class ? Initiated automatically with default values byte short int long float double char boolean All reference types 0 0 0 0L ?\u0000‘ false null package sample。 private long ltest。 private char ctes