java新手笔记20 抽象类模板（letter)

1.抽象类

package com.yfs.javase;
//信模板
public abstract class Templater {

	public abstract String toName() ;
	public abstract String fromName();
	public abstract String getContent();

	public void show() {
		System.out.println("尊敬的" + toName());
		System.out.println("\t您好！");
		System.out.println("\t\t" + getContent());
		System.out.println("\t\t\t 此致 \n\t\t\t\t 敬礼" );
		System.out.println("\t\t\t\t" + fromName());
		System.out.println("\t\t\t\t  2015.7.25" );
	}

}

2.继承 抽象类

package com.yfs.javase;

public class MyLetter extends Templater {

	@Override
	public String toName() {
		return "影分身";
	}

	@Override
	public String fromName() {
		return "yfs";
	}

	@Override
	public String getContent() {
		return "来学java,so easy!";
	}

}
class le extends Templater {

	@Override
	public String toName() {
		// TODO Auto-generated method stub
		return "Tom";
	}

	@Override
	public String fromName() {
		// TODO Auto-generated method stub
		return "lily";
	}

	@Override
	public String getContent() {
		// TODO Auto-generated method stub
		return "使用抽象类";
	}

}

3.测试 模板

package com.yfs.javase;

public class Test {

	public static void main(String[] args) {
		MyLetter letter = new MyLetter();
		letter.show();
		Templater l = new MyLetter();
		l.show();
		l = new le();
		l.show();

	}

}

4.类的继承 实例

package com.yfs.javase;

public class Student {

	private String name;
	private char sex;
	private int age;
	private int sno;
	private double middle;
	private double temp;

	// 计算综合成绩方法
	public double getTotal() {
		return 0;
	}

	@Override
	public String toString() {
		return "Student [name=" + name + ", sex=" + sex + ", age=" + age
				+ ", sno=" + sno + ", middle=" + middle + ", temp=" + temp
				+ "]";
	}

	public Student(String name, char sex, int age, int sno, double middle,
			double temp) {
		super();
		this.name = name;
		this.sex = sex;
		this.age = age;
		this.sno = sno;
		this.middle = middle;
		this.temp = temp;
	}

	public double getMiddle() {
		return middle;
	}

	public void setMiddle(double middle) {
		this.middle = middle;
	}

	public double getTemp() {
		return temp;
	}

	public void setTemp(double temp) {
		this.temp = temp;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public char getSex() {
		return sex;
	}

	public void setSex(char sex) {
		this.sex = sex;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public int getSno() {
		return sno;
	}

	public void setSno(int sno) {
		this.sno = sno;
	}

}

5. Computer 继承Student

package com.yfs.javase;

public class Computer extends Student {
	private double operator;
	private double write;

	public double getTotal() {
		return operator * 0.4 + write * 0.2 + getMiddle() * 0.2 + getTemp() * 0.2;
	}

	public Computer(String name, char sex, int age, int sno, double middle,
			double temp, double operator, double write) {
		super(name, sex, age, sno, middle, temp);
		this.operator = operator;
		this.write = write;
	}

	public double getOperator() {
		return operator;
	}

	public void setOperator(double operator) {
		this.operator = operator;
	}

	public double getWrite() {
		return write;
	}

	public void setWrite(double write) {
		this.write = write;
	}

}

6.English 继承 Student

package com.yfs.javase;

public class English extends Student {

	private double speak;

	public English(String name, char sex, int age, int sno, double middle,
			double temp, double speak) {
		super(name, sex, age, sno, middle, temp);
		this.speak = speak;
	}

	public double getSpeak() {
		return speak;
	}

	public void setSpeak(double speak) {
		this.speak = speak;
	}

	@Override
	public double getTotal() {
		return speak * 0.5 + getMiddle() * 0.25 + getTemp() * 0.25;
	}
}

7.测试 继承

package com.yfs.javase;

import java.util.Random;

public class StudentTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Student[] s = new Student[5];
//		s[0] = new English("张三", '男', 20, 5927, 85, 95, 100);
//		System.out.println("english : " + s[0].getTotal());
//		s[1] = new Computer("李四", '女', 21, 110, 90, 100, 85, 92);
//		System.out.println(s[1].getTotal());
		String[] names = {"张","王","李","赵"};
		Random ran = new Random();
		for (int i = 0; i < s.length; i++) {
			int r = ran.nextInt(101);
			if(r > 50) {
				s[i] = new English(names[ran.nextInt(4)] + i, ran.nextBoolean() ? '男' : '女', 20, 5927, 85, 95, 100);
			} else  {
				s[i] = new Computer(names[ran.nextInt(4)] + i, ran.nextBoolean() ? '男' : '女', 21, 110, 90, 100, 85, 92);
			}

		}

		for (int i = 0; i < s.length; i++) {
			System.out.println(s[i]  + "  综合成绩 ："+ s[i].getTotal());
		}
	}

}