Java编程题(3)

public String toString() { }

public static void main(String[] args) {

Demo10 d= new Demo10(110, \徐延迟\, 23); System.out.println(d.toString()); return name+\、\+id;

System.out.println(\); System.out.println(\);

System.out.println(\徐延迟\);

} }

11. 编程从三个整数x,y,z中选出最大者。

代码如下;

public class Demo11 {

public static void main(String[] args) { int max=max(155, 23, 88); System.out.println(max);

System.out.println(\); System.out.println(\); }

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System.out.println(\徐延迟\);

}

public static int max(int a, int b, int c) { return Math.max(Math.max(a, b), c); }

12.设计一个交通工具类vehicle，其数据成员包括速度speed和种类bind方法包括设置颜色setColor和取得颜色getColor，再设计一个子类Car，增加属性passenger表示可容纳旅客的人数，添加方法取得最大速度getMaxSpeed。

代码如下：

package t12;

public class vehicle { private int speed=110; private String kind; public int getSpeed() { return speed; }

public void setSpeed(int speed) { this.speed = speed; }

public String getKind() { return kind; }

public void setKind(String kind) { this.kind = kind; } }

package t12;

public class Car extends vehicle{

private int passenger;

public int getMaxSpeed(){ return super.getSpeed(); }

public static void main(String[] args) {

Car c= new Car();

System.out.println(c.getMaxSpeed()+\);

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System.out.println(\); System.out.println(\); System.out.println(\徐延迟\);

} }

13. 定义一个Point类，含有一个print方法，再定义一个类Point3d，继承自父类Point类，并覆盖父类的同名方法print()。在main方法中分别调用父类和子类的print().

代码如下：

package t13;

public class Point { public void print(){

System.out.println(\方法\);

} }

package t13;

public class Point3d extends Point{ @Override

public void print() {

System.out.println(\); }

public static void main(String[] args) { Point3d p=new Point3d(); p.print();

Point p1= new Point(); p1.print();

System.out.println(\); System.out.println(\);

System.out.println(\徐延迟\);

} }

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14. 定义一个shape抽象类，它包含一个抽象方法getArea(),在shape类上派生出Rectangle和Circle类，两者都用getArea()方法计算对象的面积。定义一个测试类Test，在该类中计算半径为2的圆的面积和宽度，高度分别为4和3的矩形的面积。

代码如下：

package t14;

public abstract class shape {

public abstract void getArea(); }

package t14;

public class Circle extends shape { private int r;

private final double PI=3.14159; public Circle(int r) { this.r = r; }

@Override

public void getArea() { double sum=r*r*PI;

System.out.println(\ } }

package t14;

public class Rectangle extends shape { private int a; private int b;

public Rectangle(int a, int b) { this.a = a; this.b = b; }

@Override

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+sum); }

public void getArea() { int sum = a * b;

System.out.println(\ + sum); }

package t14;

public class Test {

public static void main(String[] args) { Rectangle r = new Rectangle(4, 3); r.getArea();

Circle c = new Circle(2); c.getArea();

System.out.println(\); System.out.println(\);

System.out.println(\徐延迟\);

} }

15.编写Account类模拟银行储蓄账户，一个储蓄帐号有帐号、余额、年利息等属性，有存款、取款、查询方法。取款方法中，假设储蓄帐号不允许透支。

代码如下;

package t15;

public class Account { private long CardId;

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private int balance=1000;// 余额 private double accrual;// 年利息

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