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());
}
}
}