一、要求实现类Fruit，并继承水果类，派生苹果类Apple和香蕉类Banana，创建这两类的对象，然后将对象的信息输出，创建Fruit类型的数组，调用数组元素的gain()方法，输出对应的信息。具体要求如下：
①：成员变量：fruitName(水果的名字)、input(种植水果的投入)。
②：构造方法，定义多个构造方法。
③：gain() 方法：计算并返回种植水果的收益（比如，假设收益是投入的两倍）。
④：苹果类的gain() 方法：种植苹果需要另外缴纳200元的许可证费用。香蕉类的gain() 方法：种植香蕉净收入是投入的3倍。
Fruit父类
package Three; abstract public class Fruit { protected String fruitName; protected int input; public Fruit(int input) { super(); this.input = input; } public Fruit(String fruitName, int input) { this.fruitName = fruitName; this.input = input; } public void gain() { int ret = input*2; System.out.println("水果收益为："+ret); } @Override public String toString() { return "Fruit [fruitName=" + fruitName + ", input=" + input + "]"; } }Apple子类
package Three; public class Apple extends Fruit { public Apple(int input) { super(input); } public Apple(String fruitName ,int input) { super(fruitName,input); } @Override public void gain() { int ret = input*2+200; System.out.println("苹果收益为："+ret); } }Banana子类
package Three; public class Banana extends Fruit{ public Banana(int input) { super(input); } public Banana(String fruitName ,int input) { super(fruitName,input); } @Override public void gain() { int ret = input*3; System.out.println("香蕉收益为："+ret); } }Test测试类
package Three; public class Test { public static void main(String[] args) { Fruit[] fruit = new Fruit[] { new Apple("apple", 1000), new Banana("banana", 1000) }; for(int i=0;i<fruit.length;i++) { System.out.println(fruit[i].toString()); fruit[i].gain(); } } }二、在一个包内设计一个People类，它包含name,age,high属性，有相应的构造方法，分别对私有数据成员添加setter和getter方法。在另一个包中创建测试类，通过setter和getter方法来访问People类对象的数据成员。
People类
package Three2; public class People { private String name; private int age; private int high; public People() { } public People(String name, int age, int high) { this.name = name; this.age = age; this.high = high; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public int getHigh() { return high; } public void setHigh(int high) { this.high = high; } }Test测试类
package Three2; public class Test { public static void main(String[] args) { People xiaohua = new People(); xiaohua.setName("xiaohua"); xiaohua.setAge(20); xiaohua.setHigh(158); System.out.println(xiaohua.getName()); System.out.println(xiaohua.getAge()); System.out.println(xiaohua.getHigh()); } }
