JAVA课件代码

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1、第一章packagecn.edu.zhjnc;classA1{publicdoublecircleArea(doubler){returnMath.PI*r*r;}}classB1{doubler1,r2,r3;A1a=newA1();B1(doubler1,doubler2,doubler3){this.r1=r1;this.r2=r2;this.r3=r3;}}publicclassAInB{publicstaticvoidmain(String[]args){B1b=newB1(1,10,100)

2、;System.out.println(b.a.circleArea(b.r1));System.out.println(b.a.circleArea(b.r2));System.out.println(b.a.circleArea(b.r3));}}2、packagecn.edu.zhjnc;classA2{A2(intm){System.out.println("A2("+m+")");}}publicclassConstructorInheritextendsA2{ConstructorInher

3、it(intm){super(m);}publicstaticvoidmain(String[]args){//newConstructorInherit(100);//A2a2=newA2(50);//ConstructorInheritconstructorInherit=newConstructorInherit(10);//constructorInherit.A2(100);}}3、packagecn.edu.zhjnc;finalclassFinalClass{FinalClass(){Sy

4、stem.out.println("Itisafinalclass.");}}//classFCextendsFinalClass{//}4、packagecn.edu.zhjnc;classA{publicdoublecircleArea(doubler){returnMath.PI*r*r;}}classB{doubler1,r2,r3;B(doubler1,doubler2,doubler3){this.r1=r1;this.r2=r2;this.r3=r3;}}publicclassObject

5、Combine{publicstaticvoidmain(String[]args){Bb=newB(1,10.0,100.0);Aa=newA();System.out.println(a.circleArea(b.r1));System.out.println(a.circleArea(b.r2));System.out.println(a.circleArea(b.r3));}}5、packagecn.edu.zhjnc;publicclassPerson{intsalary;voidemploy

6、ed(){if(salary==0)System.out.println("nojob");elseSystem.out.println("job");}}classChildrenextendsPerson{intage;voidprintAge(){System.out.println("Age:"+age);}publicstaticvoidmain(String[]args){Childrenchildren=newChildren();children.salary=560;children.

7、age=12;children.printAge();children.employed();}}6、packagecn.edu.zhjnc;classA4{finalintid;A4(inta){id=a;}voidf(){System.out.println("superClass");}}classB4extendsA4{intid;B4(inta){super(a);}voidf(){System.out.println("subClass");}voidtest(){System.out.pr

8、intln(id+"t"+super.id);f();super.f();}publicstaticvoidmain(String[]args){finalB4b4=newB4(5);b4.test();B4bb=newB4(10);bb.test();//b4=bb;//(newB4(50)).test();}}第二章1、packagecn.edu.zhjnc;interfaceAA{voidminus(intx,inty);inta=