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1、创建一个名称为StaticDemo的类,并声明一个静态变量和一个普通变量。对变量分别赋予10和5的初始值。在main()方法中输出变量值。
编写代码如下:
1 package org.hanqi.practise; 2 3 public class StaticDemo { 4 5 private static int i = 10; 6 private int j = 5; 7 public String a() 8 { 9 return "i="+i+" j="+j; 10 } 11 12 public static void main(String[] args) { 13 14 StaticDemo b = new StaticDemo(); 15 System.out.println(b.a()); 16 } 17 }
运行结果为:
2、建立一个汽车Auto类,包括轮胎个数,汽车颜色,车身重量、速度等成员变量。并通过不同的构造方法创建实例。至少要求: 汽车能够加速,减速,停车。 再定义一个小汽车类Car,继承Auto,并添加空调、CD等成员变量,覆盖加速,减速的方法
编写代码如下:
创建Auto类:
1 package org.hanqi.practise; 2 3 public class Auto { 4 5 private int tyre; 6 private String color; 7 private double weight; 8 private double speed; 9 public Auto(int tyre, String color, double weight, double speed) { 10 super(); 11 this.tyre = tyre; 12 this.color = color; 13 this.weight = weight; 14 this.speed = speed; 15 } 16 public void accelerate() 17 { 18 System.out.println("Auto加速"); 19 } 20 public void deceleration() 21 { 22 System.out.println("Auto减速"); 23 } 24 public void stop() 25 { 26 System.out.println("Auto停车"); 27 } 28 }
创建Car类:
1 package org.hanqi.practise; 2 3 public class Car extends Auto { 4 5 6 public Car(int tyre, String color, double weight, double speed) { 7 super(tyre, color, weight, speed); 8 9 } 10 private String airconditioner; 11 private String CD; 12 public void accelerate() 13 { 14 System.out.println("Car加速"); 15 } 16 public void deceleration() 17 { 18 System.out.println("Car加速"); 19 } 20 }
3、创建一个名称为Vehicle的接口,在接口中添加两个带有一个参数的方法start()和stop()。在两个名称分别为Bike和Bus的类中实现Vehicle接口。创建一个名称为interfaceDemo的类,在interfaceDemo的main()方法中创建Bike和Bus对象,并访问start()和stop()方法。
编写代码如下:
创建Vehicle接口:
1 package org.hanqi.practise; 2 3 public interface Vehicle { 4 5 public void start(); 6 public void stop(); 7 }
创建Bike类:
1 package org.hanqi.practise; 2 3 public class Bike implements Vehicle { 4 5 @Override 6 public void start() { 7 8 9 } 10 11 @Override 12 public void stop() { 13 14 15 } 16 }
创建Bus类:
1 package org.hanqi.practise; 2 3 public class Bus implements Vehicle { 4 5 @Override 6 public void start() { 7 8 } 9 10 @Override 11 public void stop() { 12 13 } 14 }
创建InterfaceDemo类:
1 package org.hanqi.practise; 2 3 public class InterfaceDemo { 4 5 public static void main(String[] args) { 6 7 Bike bike = new Bike(); 8 bike.start(); 9 bike.stop(); 10 System.out.println(); 11 Bus bus = new Bus(); 12 bus.start(); 13 bus.stop(); 14 } 15 }
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原文地址:http://www.cnblogs.com/hanazawalove/p/5263200.html