【正文】 of teacher teacher */ public int getAge() { return age。 } …… } 海外師資、北美技術(shù)、外企經(jīng)驗(yàn) 達(dá)內(nèi)外企 IT培訓(xùn) 56 01062136369 。 02161202630； 02085518868 Create an Instance—Teacher ―Gee Zhu‖ ?Using new to create an instance public class Teacher { …… public static void main(String[] args) { Teacher gzhu = new Teacher(Gee Zhu, 30, 10000)。 (Teacher: + ())。 (\tAge: + ())。 (\tSalary: + ())。 } } 海外師資、北美技術(shù)、外企經(jīng)驗(yàn) 達(dá)內(nèi)外企 IT培訓(xùn) 57 01062136369 。 02161202630； 02085518868 Difference between Primitive Types and Reference Type ?Primitive type variables evaluation int x = 10。 int y = x。 ?Reference type variables evaluation Teacher gzhu = new Teacher(―Gee Zhu‖, 30, 10000)。 or Teacher gzhu, gzhuClone。 gzhu = new Teacher(―Gee Zhu‖, 30, 10000)。 gzhuClone = gzhu。 海外師資、北美技術(shù)、外企經(jīng)驗(yàn) 達(dá)內(nèi)外企 IT培訓(xùn) 58 01062136369 。 02161202630； 02085518868 Glossary ?Class ?Object ?Reference type ?Member 海外師資、北美技術(shù)、外企經(jīng)驗(yàn) 達(dá)內(nèi)外企 IT培訓(xùn) 59 01062136369 。 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(yàn) 達(dá)內(nèi)外企 IT培訓(xùn) 60 01062136369 。 02161202630； 02085518868 Review Questions 1.(Level 1) Which type of ment is required by Javadoc? 2.(Level 1) What types are primitive data types? 3.(Level 1) What is the difference between variable declaration an definition? 4.(Level 2) What is the relationship among class, object and reference? 5.(Level 2)Choose the valid identifiers from below (choose all that apply): A. BigLongStringWithMeaninglessName B. $int C. bytes D. finalist 海外師資、北美技術(shù)、外企經(jīng)驗(yàn) 達(dá)內(nèi)外企 IT培訓(xùn) 61 01062136369 。 02161202630； 02085518868 Review Questioncont. 1.(Level 1) Which type of ment is required by Javadoc? 2.(Level 1) What types are primitive data types? 3.(Level 1) What is the difference between variable declaration an definition? 4.(Level 2) What is the relationship among class, object and reference? 5.(Level 2)Choose the valid identifiers from below (choose all that apply): A. BigLongStringWithMeaninglessName B. $int C. bytes D. finalist 海外師資、北美技術(shù)、外企經(jīng)驗(yàn) 達(dá)內(nèi)外企 IT培訓(xùn) 62 01062136369 。 02161202630； 02085518868 6.(Level 2)What is the range of values for a variable of type short? A. Depends on the underlying hardware B. 0 through 216 1 C. 0 through 232 1 D. – 215 through 215 1 7.(Level 2)What is the range of values for a variable of type byte? A. Depends on the underlying hardware B. 0 through 28 1 C. 0 through 216 1 D. 0 through 27 1 海外師資、北美技術(shù)、外企經(jīng)驗(yàn) 達(dá)內(nèi)外企 IT培訓(xùn) 63 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(guó)北京： 電 話 ： 01062196102, 62136369 地 址：海淀區(qū)北三環(huán)西路 18號(hào) 中鼎大廈 B座 70 709室 郵編： 100086 Email: 中國(guó)上海： 電話： 02161202630， 61202603 地 址： 上海市北京東路 668號(hào) (上海科技京城 )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(yàn) 達(dá)內(nèi)外企 IT培訓(xùn) 65 01062136369 。 02161202630； 02085518868 Goals ?Instance variables and local variables ?Instance variables instantiation ?Locate and correct errors in piling process ?Operators in Java ?Primitive types evaluation ?Boolean expressions ?Using if, switch,for,while,do,break and continue to control flow 海外師資、北美技術(shù)、外企經(jīng)驗(yàn) 達(dá)內(nèi)外企 IT培訓(xùn) 66 01062136369 。 02161202630； 02085518868 Variable and Scope—Local Variable package sample。 public class LocalVariableTest { public void correctLocalV() { int x。 //Just declare int y = 10。 //Declare and initiate x = 20。 //Evaluate int z = x + y。 //Declare and initiate String str = Hello。 //Declare and initiate String str1 = new String(World)。 //Declare and initiate char ch。 //Just declare ch = 39。c39。 //Evaluate } public void incorrectLocalV() { int x, z。 //Declare only int y = 10。 if( y 20) z = x + y。 //x isn39。t be initiated String str。 //Declare only String str1 = Hello + new String( World) + str。 //str isn39。t be initiated } } ?Defined in methods ?Must be initiated before being used 海外師資、北美技術(shù)、外企經(jīng)驗(yàn) 達(dá)內(nèi)外企 IT培訓(xùn) 67 01062136369 。 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。 public class InstanceVarariableTest { //primitive type variables private int itest。 private byte btest。 private short stest。 private long ltest。 private float ftest。 private double dtest。 private boolean bltest。 private char ctest。 //reference variable String strTest。 public static void main(String[] args) { String t = \t。 InstanceVarariab