JAVA课件代码资料.doc

???.; class A1{ public double circleArea(double r){ return *r*r; }} class B1{ double r1,r2,r3; A1 a=new A1(); B1(double r1,double r2,double r3){ =r1; =r2; =r3; }} public class AInB { public static void main(String[] args) { B1 b=new B1(1,10, 100); (()); (()); (()); }}2?.; class A2{ A2(int m){("A2("+m+")");} } public class ConstructorInherit extends A2 { ConstructorInherit(int m){super(m);} public static void main(String[] args) { //new ConstructorInherit(100); //A2 a2=new A2(50); //ConstructorInherit constructorInherit=new ConstructorInherit(10); //(100); }}3?.; final class FinalClass { FinalClass(){ ("It isa final class."); }} //class FC extends FinalClass{ //} 4?.; class A{ public double circleArea(double r){ return *r*r; }} class B{ double r1,r2,r3; B(double r1,double r2,double r3){ =r1; =r2; =r3; }} public class bine { public static void main(String[] args) { B b= new B(1, , ); A a=new A(); (()); (()); (()); }}5?.; public class Person { int salary; void employed(){ if(salary==0) ("no job"); else ("job"); }} class Children extends Person{ int age; void printAge(){("Age:"+age);} public static void main(String[] args) { Children children=new Children(); =560; =12; (); (); }}6?.; class A4{ final int id; A4(int a){id=a;} void f(){("superClass");} } class B4 extends A4{ int id; B4(int a){super(a);} void f(){("subClass");} void test(){ (id+"\t"+); f(); (); } public static void main(String[] args) { final B4 b4