2016/1/18 correction Supplement 2016/1/17 rectangle area 1, construction method initialize length and width, 2, define member method to find rectangular area

1  PackageCaipiao;2 3 Importjava.util.*;//introduce Java tools. Util is the abbreviation of utiliy, meaning for multipurpose,4                         //tool nature of the package this package is mainly stored in: collection classes (such as ARRAYLIST,HASHMAP, etc.),5                         //the random number generation class, the property file reads the class, the timer class and so on class. 6  Public classJuXing1 {//These classes are extremely handy for Java programming, and these classes are often used in everyday Java programming. 7     //Properties8     Private DoubleChang; //Privatization 9     Private DoubleKuan; //Privatization Ten      One      Public DoubleGetchang () {//used to read into can be adjusted Getchang is the method name verb plus noun Note writing standard case A         returnChang; -     } -     //Write Changes the     voidSetchang (DoubleChang) { //validation method takes into account whether the long data is valid for negative data  -         if(chang>0) {//Add Validation -              This. chang=Chang; -         } +         Else{ -SYSTEM.OUT.PRINTLN ("Invalid length entered"); +         } A     } at      Public DoubleGetkuan () { //and the same as on the Kuan Privatization transfer read  -         returnKuan; -     } -     voidSetkuan (DoubleKuan) { //Verify the validity of wide data  -         if(kuan>0){ -              This. kuan=Kuan; This is a pointer to a property name defined in this class, especially if the parameter name and the defined property name  are the same in         } -         Else{ toSYSTEM.OUT.PRINTLN ("Input width is invalid"); +         } -     } the      *      Public DoubleMianji () { $         returnchang*Kuan;Panax Notoginseng     } -      the     //constructor method without parameter default construction method + JuXing1 () { A          the     } +     //Assigning a value to a property -      PublicJuXing1 (DoubleChangDoubleKuan) { $ Setchang (Chang); $ Setkuan (Kuan); -     } -     //method for process-oriented writing the      Public DoubleGetmianji (DoubleChangDoubleKuan) { -         returnchang*Kuan;Wuyi     } the     //Object-oriented approach -      Public DoubleGetmianji () { Wu         return  This. chang*Kuan; - } About  $  -}

You need to validate the output by referencing properties and methods under the Main method

1  Public Static void Main (string[] args) {2 JuXing1 jj=new  JuXing1 (); 3        Jj.setchang (+); 4        Jj.setkuan (+); 5 System.out.println (Jj.getmianji ()); 6 }

2016/1/18 correction Supplement 2016/1/17 rectangle area 1, construction method initialize length and width, 2, define member method to find rectangular area