用java语言编写程序

没什么好说的，都不需要注释，看代码：

（1）

import java.util.ArrayList;
import java.util.List;

public class TestTeacher {
	private static List teachers = new ArrayList();
	public static void main(String[] args) {
		teachers.add(new Professor("赵一", 8));
		teachers.add(new AssociateProfessor("钱二", 16));
		teachers.add(new Instructor("孙三", 32));
		teachers.add(new TeachingAssisant("李四", 64));
		System.out.println("姓名\t职称\t税前工资");
		for(Teacher teacher : teachers) {
			teacher.display();
		}
	}

}
abstract class Teacher {
	protected String name;
	protected String jobTitle;
	protected int lessons;
	public Teacher(String name, String jobTitle, int lessons) {
		this.name = name;
		this.jobTitle = jobTitle;
		this.lessons = lessons;
	}
	public abstract double calcSalary();
	
	public void display() {
		System.out.println(String.format("%s\t%s\t%.0f", name, jobTitle, calcSalary()));
	}
}

class Professor extends Teacher {
	public Professor(String name, int lessons) {
		super(name, "教授", lessons);
	}
	@Override
	public double calcSalary() {
		return 5000 + 50 * lessons;
	}
}
class AssociateProfessor extends Teacher {
	public AssociateProfessor(String name, int lessons) {
		super(name, "副教授", lessons);
	}
	@Override
	public double calcSalary() {
		return 3000 + 30 * lessons;
	}
}
class Instructor extends Teacher {
	public Instructor(String name, int lessons) {
		super(name, "讲师", lessons);
	}
	@Override
	public double calcSalary() {
		return 2000 + 20 * lessons;
	}
}
class TeachingAssisant extends Teacher {
	public TeachingAssisant(String name, int lessons) {
		super(name, "助教", lessons);
	}
	@Override
	public double calcSalary() {
		return 1000 + 10 * lessons;
	}
}

（2）

public class TestFood {

	public static void main(String[] args) {
		Food apple = new Apple();
		Food beaf = new Beaf();
		apple.doEat();
		beaf.doEat();
	}

}
interface Food {
	void doEat();
}

class Fruit {
	protected static final String PROPERTY = "水果";
}
class Meat {
	protected static final String PROPERTY = "肉类";
}

class Apple extends Fruit implements Food {
	@Override
	public void doEat() {
		System.out.println("我是苹果，我属于" + PROPERTY + "，我可以充当食物被吃掉！");
	}
}
class Beaf extends Meat implements Food {
	@Override
	public void doEat() {
		System.out.println("我是牛肉，我属于" + PROPERTY + "，我可以充当食物被吃掉！");
	}
}

package entity;

public abstract class Teacher {
public double basePay;// 固定工资
public double subsidy;// 授课补贴单价
public String jopName;// 职称
public int workTimes;// 授课数量
public int id;// 人员编号

public String name;// 人员名称

/**
* 工资计算
*
* @return
*/
public abstract double countPay();
}
package entity;

public class Professor extends Teacher {

public Professor() {
this.jopName="教授";
this.basePay=500;
this.subsidy=50;
}

@Override
public double countPay() {
return this.basePay+this.subsidy*this.workTimes;
}

}

package entity;

public class Lecturer extends Teacher {

public Lecturer() {
this.jopName="讲师";
this.basePay=200;
this.subsidy=20;
}

@Override
public double countPay() {
return this.basePay+this.subsidy*this.workTimes;
}

}

package entity;

public class HelperTeacher extends Teacher {

public HelperTeacher() {
this.jopName="助教";
this.basePay=100;
this.subsidy=10;
}

@Override
public double countPay() {

return this.basePay+this.subsidy*this.workTimes;
}

}

package entity;

public class AssociateProfessor extends Teacher {

public AssociateProfessor() {
this.jopName="副教授";
this.basePay=300;
this.subsidy=30;
}

@Override
public double countPay() {
return this.basePay+this.subsidy*this.workTimes;
}

}

package entity;

public interface Food {
public String show();
}

package entity;

public class Meat {
public String name;
public String type="肉类";
public String doing="我可以充当食物被吃掉！";
}

package entity;

public class Beef extends Meat implements Food {

public Beef() {
this.name="牛肉";
}

@Override
public String show() {
String str="我是+"+name+",我属于"+type+"，"+doing;
System.out.println(str);
return str;
}

}

package entity;

public class Fruit {
public String name;
public String type="水果";
public String doing="我可以充当食物被吃掉！";
}

package entity;

public class Apple extends Fruit implements Food {

public Apple() {
this.name="苹果";
}

@Override
public String show() {
String str="我是+"+name+",我属于"+type+"，"+doing;
System.out.println(str);
return str;
}

}