JAVA课件代码.doc

第一章package .zhjnc;class A1public double circleArea(double r)return Math.PI*r*r;class B1double r1,r2,r3;A1 a=new A1();B1(double r1,double r2,double r3)this.r1=r1;this.r2=r2;this.r3=r3;public class AInB public static void main(String args) B1 b=new B1(1,10, 100);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、package .zhjnc;class A2A2(int m)System.out.println(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);/constructorInherit.A2(100);3、package .zhjnc;final class FinalClass FinalClass()System.out.println(It is a final class.);/class FC extends FinalClass/4、package .zhjnc;class Apublic double circleArea(double r)return Math.PI*r*r;class Bdouble r1,r2,r3;B(double r1,double r2,double r3)this.r1=r1;this.r2=r2;this.r3=r3;public class ObjectCombine public static void main(String args) B b= new B(1, 10.0, 100.0);A a=new A();System.out.println(a.circleArea(b.r1);System.out.println(a.circleArea(b.r2);System.out.println(a.circleArea(b.r3);5、package .zhjnc;public class Person int salary;void employed()if(salary=0) System.out.println(no job);else System.out.println(job);class Children extends Personint age;void printAge()System.out.println(Age:+age);public static void main(String args) Children children=new Children();children.salary=560;children.age=12;children.printAge();children.employed();6、package .zhjnc;class A4final int id;A4(int a)id=a;void f()System.out.println(superClass);class B4 extends A4int id;B4(int a)super(a);void f()System.out.println(subClass);void test()System.out.println(id+t+super.id);f();super.f();public static void main(String args) final B4 b4=new B4(5);b4.test();B4 bb=new B4(10);bb.test();/b4=bb;/(new B4(50).test();第二章1、package .zhjnc;interface AAvoid minus(int x,int y);int a=100;int b=300;interface BB extends AAvoid time(int x,int y);public class InterfaceInherit implements AA,BBpublic void minus(int x, int y) System.out.println(x-y);public void time(int x,int y)System.out.println(x*y);public static void main(String args) AA aa=new InterfaceInherit();aa.minus(a, b);BB bb=new InterfaceInherit();bb.time(a,b);/InterfaceInherit aa=new InterfaceInherit();/aa.minus(a, b);/aa.time(a, b);2、package .zhjnc;interface Peoplevoid peopleList();class Student implements Peoplepublic void peopleList()System.out.println(I am a student.);class Teacher implements Peoplepublic void peopleList()System.out.println(I am a teacher.);public class InterfaceToUp public static void main(String args) People people;people=new Student();people.peopleList();people=new Teacher();people.peopleList();3、package .zhjnc;interface IntA void IntAFun(); interface IntB void IntBFun(); public class MultiInherit implements IntA,IntBpublic void IntAFun()System.out.println(IntAFun();public void IntBFun()System.out.println(IntBFun();class MultiInheritTestpublic static void main(String args) IntA a;a=new MultiInherit();a.IntAFun();IntB b;b=new MultiInherit();b.IntBFun();/MultiInherit m=new MultiInherit();/m.IntAFun();/m.IntBFun();4、package .zhjnc;public interface MyInterface public abstract void add(int x,int y);public static final int Count=10;/void add(int x,int y);/int Count=10;class TestInterface implements MyInterfacepublic void add(int x,int y)System.out.println(x+y);void getA()System.out.println(Count);public static void main(String args) TestInterface testInterface=new TestInterface();testInterface.add(10, 20);testInterface.getA();5、package .zhjnc;/import java.util.Scanner;abstract class Shapeabstract double getL();abstract double getS();void printSL()System.out.println(L=+this.getL()+,S=+this.getS();class Circle extends Shapedouble r;Circle(double r)this.r=r;double getL()return 2*Math.PI*r;double getS()return Math.PI*r*r;class Square extends Shapedouble w,h;Square(double w,double h)this.w=w;this.h=h;double getL()return 2*(w+h);double getS()return w*h;class Triangle extends Shapedouble a,b,c;Triangle(double a,double b,double c)this.a=a;this.b=b;this.c=c;double getL()return (a+b+c);double getS()double p=(a+b+c)/2.0;return Math.sqrt(p-a)*(p-b)*(p-c)*p);public class TestAbstract public static void main(String args) Shape s;/double a,b,c;/Scanner sc=new Scanner(System.in);/a=sc.nextDouble();/b=sc.nextDouble();/c=sc.nextDouble();/while(!(a+bc&a-bc)/a=sc.nextDouble();/b=sc.nextDouble();/c=sc.nextDouble();/sc.close();/s=new Triangle(a, b, c);s=new Triangle(3, 4, 5);/向上转型s.printSL();s=new Square(4, 5);s.printSL();s=new Circle(10);s.printSL();6、package .zhjnc;class A1 A1()System.out.println(A1()t);void f()System.out.println(A1.f()t);class B1 extends A1void f()System.out.println(B1.f()t);void g()System.out.println(B1.g()t);public static void main(String args) A1 a1=new B1();B1 b1=(B1)a1;/只能针对指向子类对象的父类对象引用进行向下转换a1.f();b1.f();b1.g();7、package .zhjnc;class A A()System.out.println(A()t);void f()System.out.println(A.f()t);class B extends Avoid f()System.out.println(B.f()t);void g()System.out.println(B.g()t);public static void main(String args) A a1=new A();A a2=new B();a1.f();a2.f();/a2.g();第三章1、package mylib.simple.test;import mylib.simple.Public;public class TestPublic public static void main(String args) Public public1=new Public();public1.x=10;public1.prn();2、package mylib.simple;public class Base private int x;private void print()System.out.println(x);void doprint()print();3、package mylib.simple;class Defalut protected int x;void prn()System.out.println(x);4、package mylib.simple;public class Private int a=10;private class Innint b=5;public void getA()System.out.println(a);public void getS()getB();public void getB()Inn inn=new Inn();System.out.println(inn.b);public void getN()Inn inn=new Inn();inn.getA();inn.getS();public static void main(String args) Private private1=new Private();private1.getB();private1.getN();5、package mylib.simple;public class Public public int x;public void prn()System.out.println(x);6、package mylib.simple;/import mylib.simple.*;public class TestBase public static void main(String args) /mylib.simple.Base base=new mylib.simple.Base();/Base base=new Base();/base.x=5;/base.print();7、package mylib.simple;class TestDefault public static void main(String args) Defalut defalut=new Defalut();defalut.x=10;defalut.prn();第四章1、package mypro01;public class Hello public static void main(String args)int a=32;int b=a*2;int c=b*5;System.out.println(c);2、package mypro01;/* * (#)Text1.java * * * author * version 1.00 2013/12/16 */public class HelloWorld public static void main (String args) System.out.println(Hello World!); 第五部分1、package myPro02;class CleverCircle1 double r;CleverCircle1(double x)r=x;double getL()return 2*Math.PI*r;double getS()return Math.PI*r*r;2、package myPro02;class CleverCircle double r;CleverCircle(double x)r=x;double getL()return 2*Math.PI*r;double getS()return Math.PI*r*r;class CleverCircleTestpublic static void main(String args) CleverCircle cc=new CleverCircle(2);System.out.println(cc.getL()+t+cc.getS();cc=new CleverCircle(3.5);System.out.println(cc.getL()+t+cc.getS();3、package myPro02;public class Flower static int num=0;Flower()num+;System.out.println(num+朵花开了！);public static void main(String args) new Flower();new Flower();new Flower();4、package myPro02;public class HelloWorld public static void main(String args) System.out.println(Hello World!);5、package myPro02;public class NewFlower static int num=0;public NewFlower() num+;System.out.println(num+朵花开了！);NewFlower(String color)num+;System.out.println(num+朵花开了！.是+color+花);public static void main(String args) new NewFlower();new NewFlower(红);new NewFlower(黄);6、package myPro02;public class Rectangle double w;double h;Rectangle(double x)w=h=x;Rectangle(double x,double y)w=x;h=y;double getS()return w*h;7、package myPro02;public class RectangleTest public static void main(String args) System.out.println(new Rectangle(2.3,4.5).getS();System.out.println(new Rectangle(7.6).getS();8、package myPro02;class Testpublic static void main(String args) CleverCircle cc=new CleverCircle(2);System.out.println(cc.getL()+t+cc.getS();cc=new CleverCircle(3.5);System.out.println(cc.getL()+t+cc.getS();9、package myPro02;public class TestB int a,b,c;TestB(int a,int b,int c)this.a=a;this.b=b;this.c=c;System.out.println(a+b+c);TestB(int a,int b)/第一个构造方法this.a=a;/a+;this.b=b;/b+;System.out.println(a+-+b+t+this.sum();/调用成员方法TestB(int a)this(1, a);/第二个构造方法，调用前一个构造方法TestB()this(1,100,1);int sum()int s=0;for (int i = a; i =b; i+) s+=i;return s;public static void main(String args) new TestB(10,20); new TestB(100);new TestB();10、 package myPro02; public class TestInitA int x;Flower flower;boolean b;public static void main(String args) TestInitA ti=new TestInitA();System.out.println(x is +ti.x);System.out.println(flower is +ti.flower);System.out.println(b is +ti.b);11、package myPro02;public class TestInitB public static void main(String args) int x=100;System.out.println(nx is +x);12、package myPro02;public class TestInitC int x=3;TestInitC()x=5;public static void main(String args) TestInitC t=new TestInitC();System.out.println(t.x);13、package myPro02;public class TestInitD TestInitD()x=5;int x=3;public static void main(String args) TestInitD t=new TestInitD();System.out.println(t.x);14、package myPro02;class BB(int m)System.out.println(B(+m+);class AB b1=new B(1);static B b2=new B(2);public class TestInitE public static void main(String args) System.out.println(Creating an A object.);new A();System.out.println(Creating another A object.);new A();15、package myPro02;public class TestOL int x;void func()System.out.println(no arg);String func(int i)return arg is +i;void func(String s)System.out.println(s);public static void main(String args) TestOL c=new TestOL();c.func();c.func(c.func(100);16、package myPro02;public class TestOL1 void func(double x)System.out.println(x+ is double);void func(int x)System.out.println(x+ is int);public static void main(String args) TestOL1 c=new TestOL1();c.func(1);c.func(2.5);c.func(3.5f);17、package myPro02;public class ThisTest int a;ThisTest(int b)/参数(方法中的变量)与成员变量同名this.a=b; /成员变量a取得参数值 a+;public static void main(String args) System.out.println(new ThisTest(5).a);/结果是5还是6?第六部分1、package .zhjnc.test;import mylib.simple.List;public