Java Programming test (1)

1  Packagetest;2 3 classA4 {5     Private Static intI//Static, Private Attribute6     Private Static intJ//Static, Private Attribute7     Private Static intCNT = 0;//statistic The number of the object8     voidSetintAintb//Set The value by the function in class9{//The security can be guaranteedTeni =A; Onej =b; A     } -      -      PublicAintAintb//Construction Method the     { -System.out.printf ("The function has been called!\n"); -i =A; -j =b; +cnt++; -     } +      A      Public Static intCnt ()//Get The number of the object in this class at{//It should can be static because we can -         returnCnt//a.cnt -     } -      -      Public voidShow ()//A Show Method in the class -     { inSystem.out.printf ("The value in this object:i=%d,j=%d\n", i,j); -     } to      +      - } the  *  $ ///////////extends/////////////////////Panax Notoginseng classHuman - { the      PublicString name = "Mike"; +      Public intAge = 22; A     } the  + classStudentextendsHuman - { $      Public DoubleScore = 90; $     } -  - classGraduateextendsStudent the { -      PublicString tutor = "Jay";Wuyi     } the /*************extends**********************/ -  Wu  -  Public classTestmemo { About      $     Static intAddintAintb//The reentry of a function -     { -         return(A +b); -     } A      +     Static intAddintAintBintC//The reentry of a function the     { -         return(a+b+c); $     } the  the     Static DoubleAddDoubleADoubleb//The reentry of a function the     { the         returnA +b; -     } in      Public Static voidMain (string[] args)//The reentry of a function the     { theA AA =NewA (66,88); About //aa.i = +; the //AA.J =; the         //Aa.set (in); the aa.show (); +SYSTEM.OUT.PRINTF ("Both int value be plused:%d\n", add (2,8)); -SYSTEM.OUT.PRINTF ("Three int value be plused:%d\n", add ()); theSystem.out.printf ("Both float value be plused:%f\n", add (1.9,2.0));BayiA BB =NewA (12,10);//Change the value in the class by another object theAa.show ();//because of the static attribute theSystem.out.printf ("The Vaule count in A class:%d\n", a.cnt ()); -Graduate Stu =Newgraduate (); -System.out.printf ("Test of EXTENDS:%s ' s tutor is%s\n", stu.name,stu.tutor); theSystem.out.printf ("Test of EXTENDS:%s ' s is%d\n", stu.name,stu.age); the     } the}

Java Programming test (1)