题目内容

读下面程序,写出程序运行结果。classPoint{intx=1;publicvoidshow(){System.out.println(x);}}classSPointextendsPoint{inty=2;publicvoidshow(){System.out.println(x+","+y);}}classPPointextendsPoint{intz=3;publicvoidshow(){System.out.println(x+","+z);}}publicclasstempDemo{publicstaticvoidmain(String[]args){Pointp;p=newPoint();p.show();p=newSPoint();p.show();p.x=2;p.show();p=newPPoint();p.show();}}运行结果为:

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在(1)~(3)处填上适当的语句,使程序能正常运行。.(1)classEmployee{publicabstractvoidshow();}classSalEmpextendsEmployee{publicvoidshow(){System.out.println("SalEmp");}}classTelEmpextendsEmployee{(2){System.out.println("TelEmp");}}publicclassDemo{publicstaticvoidmain(String[]args){SalEmpp=newSalEmp();p.show();(3)p1=newTelEmp();p1.show();}}

读下面程序,写出程序运行结果。classPerson{inta,b;publicPerson(inta,intb){System.out.println("a,b:"+a+b);}}classStudentextendsPerson{intc;publicStudent(inta,intb,intc){super(a,b);this.c=c;System.out.println("c:"+c);}publicvoidshow(){System.out.println("a,b,c:"+a+b+c);}}publicclassclassDemo1{publicstaticvoidmain(String[]args){Personp1=newPerson(1,2);Studentp2=newStudent(2,3,4);p2.show();}}运行结果为:

读下面程序,写出程序运行结果。abstractclassGraph{inta;publicGraph(){a=1;}publicGraph(inta){this.a=a;}publicabstractvoidshowArea();}classRectextendsGraph{intb;publicRect(inta,intb){super(a);this.b=b;}publicvoidshowArea(){System.out.println("Area:"+(ab));}}classCircleextendsGraph{publicCircle(){};publicCircle(inta){super(a);}publicvoidshowArea(){System.out.println("Area:"+(3.14a*a));}}publicclassclassDemo1{publicstaticvoidmain(String[]args){Graphg1;g1=newRect(2,3);g1.showArea();g1=newCircle(2);g1.showArea();g1=newCircle();g1.showArea();}}运行结果为:

在(1)~(3)处填上适当的语句,使程序能正常运行。.abstractclassPerson{public(1)show();}classStudentextendsPerson{public(2){System.out.println("Student");}}(3){publicvoidshow(){System.out.println("Teacher");}}publicclassDemo{publicstaticvoidmain(String[]args){Personp;p=newStudent();p.show();p=newTeacher();p.show();}}