java程序设计基础_陈国君版第五版_第七章例题
2024-04-18 18:57:32
java程序设计基础_陈国君版第五版_第七章例题
class Cylinder
{private double radius;private int height;private double pi = 3.14;double area(){return pi*radius*radius;}double volume(){return area()*height;}
}
public class Main7_1 {public static void main(String[] args){Cylinder volu;volu = new Cylinder();//volu.radius = 2.8 ;//volu.height = 5;//System.out.println("底圆半径="+volu.radius);//System.out.println("圆柱的高="+volu.height);System.out.print("圆柱");System.out.println("底面积 = " + volu.area());System.out.println("圆柱体体积 ="+volu.volume());}
}
class Cylinder1
{private double radius;private int height;private double pi = 3.14;public void setCylinder(double r,int h){if(r>0&&h>0){radius = r;height = h;}else System.out.println("您的数据有错误！");}double area(){return pi*radius*radius;}double volume(){return area()*height;}
}
public class Main7_2 {public static void main(String[] args){Cylinder1 volu = new Cylinder1();volu.setCylinder(2.5,-5);System.out.println("圆柱底面积 = "+volu.area());System.out.println("圆柱体体积 = "+volu.volume());}
}
class Cylinder2
{private double radius;private int height;private double pi = 3.14;private String color;public double setCylinder(double r,int h){radius = r;height = h ;return r+h;}public void setCylinder(String str){color = str;}public void show(){System.out.println("圆柱的颜色为："+color);}double area(){return pi*Math.pow(radius,2);}double volume(){return area()*height;}
}
public class Main7_3 {public static void main(String[] args){double r_h;Cylinder2 volu = new Cylinder2();r_h = volu.setCylinder(2.5,5);volu.setCylinder("红色");System.out.println("圆柱底半径和高之和= "+r_h);System.out.println("圆柱体体积 = "+volu.volume());volu.show();}
}
class Cylinder4
{private double radius;private int height;private double pi = 3.14;public Cylinder4(double r,int h){radius = r;height = h;}double area(){return pi*radius*radius;}double volume(){return area()*height;}
}
public class Main7_4 {public static void main(String[] args){Cylinder4 volu = new Cylinder4(3.5,8);System.out.println("圆柱底面积 ="+ volu.area());System.out.println("圆柱体体积 ="+ volu.volume());}
}
class Cylinder5
{private double radius;private int height;private double pi = 3.14;private String color;public Cylinder5(){radius = 1;height = 2;color = "绿色";}public Cylinder5(double r, int h , String str){radius = r;height = h;color = str;}public void setColor(){System.out.println("该圆柱的颜色为："+color);}double area(){return pi*radius*radius;}double volume(){return area()*height;}
}
public class Main7_5 {public static void main(String[] args){Cylinder5 volu1 = new Cylinder5();System.out.println("圆柱1底面积 ="+ volu1.area());System.out.println("圆柱1体积 ="+ volu1.volume());volu1.setColor();Cylinder5 volu2 = new Cylinder5(2.5,8,"红色");System.out.println("圆柱2底面积 ="+ volu2.area());System.out.println("圆柱2体积 ="+ volu2.volume());volu2.setColor();}
}
class Cylinder6
{private double radius;private int height;private double pi = 3.14;String color;public Cylinder6(){this(2.5,5,"红色");System.out.println("无参构造方法被调用了");}public Cylinder6(double r ,int h,String str){System.out.println("有参构造方法被调用了");radius = r;height = h;color = str;}public void show(){System.out.println("圆柱底半径为："+radius);System.out.println("圆柱体的高为："+height);System.out.println("圆柱的颜色为："+color);}double area(){return pi*radius*radius;}double volume(){return area()*height;}
}
public class Main7_6 {public static void main(String[] args){Cylinder6 volu1 = new Cylinder6();System.out.println("圆柱1底面积 ="+ volu1.area());System.out.println("圆柱1体积 ="+ volu1.volume());volu1.show();}
}
class Cylinder7
{private double radius;private int height;private double pi = 3.14;private String color;public Cylinder7(){System.out.println("无参构造方法被调用了");}public Cylinder7(double r, int h,String str){this();radius = r;height = h;color = str;}public void show(){System.out.println("圆柱底半径为："+radius);System.out.println("圆柱体的高为："+height);System.out.println("圆柱的颜色为："+color);}double area(){return pi*radius*radius;}double volume(){return area()*height;}
}
public class Main7_7 {public static void main(String[] args){Cylinder7 volu1 = new Cylinder7(2.5,5,"蓝色");System.out.println("圆柱1底面积 ="+ volu1.area());System.out.println("圆柱1体积 ="+ volu1.volume());volu1.show();}
}
class Cylinder8
{private static int num = 0;private static double pi = 3.14;private double radius ;private int height;public Cylinder8(double r,int h){radius = r;height = h;num++;}public void count(){System.out.print("创建了"+num+"个对象");}double area(){return pi*radius*radius;}double volume(){return area()*height;}
}
public class Main7_8 {public static void main(String[] args){Cylinder8 volu1 = new Cylinder8 (2.5,5);volu1.count();System.out.println("圆柱1的体积 ="+volu1.volume());Cylinder8 volu2 = new Cylinder8(1.0,2);volu2.count();System.out.println("圆柱2的体积 = "+volu2.volume());}
}
class Cylinder9
{private static int num = 0;private static double pi = 3.14;private double radius ;private int height;public Cylinder9(double r,int h){radius = r;height = h;num++;}public static void count(){System.out.println("创建了"+num+"个对象");}double area(){return pi*radius*radius;}double volume(){return area()*height;}
}
public class Main7_9 {public static void main(String[] args){Cylinder9.count();Cylinder9 volu1 = new Cylinder9 (2.5,3);volu1.count();System.out.println("圆柱1的体积 ="+volu1.volume());Cylinder9 volu2 = new Cylinder9 (1.0,2);volu2.count();System.out.println("圆柱2的体积 = "+volu2.volume());}
}
class Cylinder10
{private static double pi = 3.14;private double radius ;private int height;public Cylinder10(double r,int h){radius = r;height = h;}public void setCylinder(double r, int h){radius = r;height = h;}double volume(){return pi*radius*radius*height;}
}
public class Main7_10 {public static void main(String[] args){Cylinder10 volu1,volu2;volu1 = new Cylinder10 (2.5,5);System.out.println("圆柱1的体积 ="+volu1.volume());volu2 = volu1;volu2.setCylinder(1.0,2);System.out.println("圆柱2的体积 = "+volu2.volume());}
}
class Cylinder11
{private static double pi = 3.14;private double radius ;private int height;public Cylinder11(double r,int h){radius = r;height = h;}public void compare(Cylinder11 volu){if(this == volu){System.out.println("这两个对象相等");}elseSystem.out.println("这两个对象不相等");}
}
public class Main7_11 {public static void main(String[] args){Cylinder11 volu1 = new Cylinder11(1.0,2);Cylinder11 volu2 = new Cylinder11(1.0,2);Cylinder11 volu3 = volu1;volu1.compare(volu2);volu1.compare(volu3);}
}
class Person
{private String name;private int age;public Person(String name,int age){this.name = name;this.age = age;}public Person compare(Person p){if(this.age>p.age)return this;elsereturn p;}
}
public class Main7_12 {public static void main(String[] args){Person per1 = new Person("张三",20);Person per2 = new Person("李四",21);Person per3;per3 = per1.compare(per2);if(per3 == per1)System.out.println("张三年龄大");elseSystem.out.println("李四年龄大");}
}
class Person13
{private String name;private int age;public Person13(String name,int age){this.name = name;this.age = age;}public void show(){System.out.println("姓名："+name+"\t年龄："+age);}
}
public class Main7_13 {public static void main(String[] args){Person13 [] per;per = new Person13[3];per[0] = new Person13("张三",20);per[1] = new Person13("李四",21);per[2] = new Person13("王二",19);per[2].show();per[0].show();}
}
class Person14
{private String name;private int age;public Person14(String name,int age){this.name = name;this.age = age;}public static int minAge(Person14[] p){int min = Integer.MAX_VALUE;for(int i = 0;i < p.length ; i++)if(p[i].age< min)min = p[i].age;return min;}
}
public class Main7_14 {public static void main(String[] args){Person14 [] per = new Person14[3];per[0] = new Person14("张三",20);per[1] = new Person14("李四",21);per[2] = new Person14("王二",19);System.out.println("最小的年龄为：" + Person14.minAge(per));}
}
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